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/* Match-and-simplify patterns for shared GENERIC and GIMPLE folding.
This file is consumed by genmatch which produces gimple-match.cc
and generic-match.cc from it.
Copyright (C) 2014-2022 Free Software Foundation, Inc.
Contributed by Richard Biener <rguenther@suse.de>
and Prathamesh Kulkarni <bilbotheelffriend@gmail.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Generic tree predicates we inherit. */
(define_predicates
integer_onep integer_zerop integer_all_onesp integer_minus_onep
integer_each_onep integer_truep integer_nonzerop
real_zerop real_onep real_minus_onep
zerop
initializer_each_zero_or_onep
CONSTANT_CLASS_P
tree_expr_nonnegative_p
tree_expr_nonzero_p
integer_valued_real_p
integer_pow2p
uniform_integer_cst_p
HONOR_NANS
uniform_vector_p
expand_vec_cmp_expr_p
bitmask_inv_cst_vector_p)
/* Operator lists. */
(define_operator_list tcc_comparison
lt le eq ne ge gt unordered ordered unlt unle ungt unge uneq ltgt)
(define_operator_list inverted_tcc_comparison
ge gt ne eq lt le ordered unordered ge gt le lt ltgt uneq)
(define_operator_list inverted_tcc_comparison_with_nans
unge ungt ne eq unlt unle ordered unordered ge gt le lt ltgt uneq)
(define_operator_list swapped_tcc_comparison
gt ge eq ne le lt unordered ordered ungt unge unlt unle uneq ltgt)
(define_operator_list simple_comparison lt le eq ne ge gt)
(define_operator_list swapped_simple_comparison gt ge eq ne le lt)
#include "cfn-operators.pd"
/* Define operand lists for math rounding functions {,i,l,ll}FN,
where the versions prefixed with "i" return an int, those prefixed with
"l" return a long and those prefixed with "ll" return a long long.
Also define operand lists:
X<FN>F for all float functions, in the order i, l, ll
X<FN> for all double functions, in the same order
X<FN>L for all long double functions, in the same order. */
#define DEFINE_INT_AND_FLOAT_ROUND_FN(FN) \
(define_operator_list X##FN##F BUILT_IN_I##FN##F \
BUILT_IN_L##FN##F \
BUILT_IN_LL##FN##F) \
(define_operator_list X##FN BUILT_IN_I##FN \
BUILT_IN_L##FN \
BUILT_IN_LL##FN) \
(define_operator_list X##FN##L BUILT_IN_I##FN##L \
BUILT_IN_L##FN##L \
BUILT_IN_LL##FN##L)
DEFINE_INT_AND_FLOAT_ROUND_FN (FLOOR)
DEFINE_INT_AND_FLOAT_ROUND_FN (CEIL)
DEFINE_INT_AND_FLOAT_ROUND_FN (ROUND)
DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
/* Unary operations and their associated IFN_COND_* function. */
(define_operator_list UNCOND_UNARY
negate)
(define_operator_list COND_UNARY
IFN_COND_NEG)
/* Binary operations and their associated IFN_COND_* function. */
(define_operator_list UNCOND_BINARY
plus minus
mult trunc_div trunc_mod rdiv
min max
IFN_FMIN IFN_FMAX
bit_and bit_ior bit_xor
lshift rshift)
(define_operator_list COND_BINARY
IFN_COND_ADD IFN_COND_SUB
IFN_COND_MUL IFN_COND_DIV IFN_COND_MOD IFN_COND_RDIV
IFN_COND_MIN IFN_COND_MAX
IFN_COND_FMIN IFN_COND_FMAX
IFN_COND_AND IFN_COND_IOR IFN_COND_XOR
IFN_COND_SHL IFN_COND_SHR)
/* Same for ternary operations. */
(define_operator_list UNCOND_TERNARY
IFN_FMA IFN_FMS IFN_FNMA IFN_FNMS)
(define_operator_list COND_TERNARY
IFN_COND_FMA IFN_COND_FMS IFN_COND_FNMA IFN_COND_FNMS)
/* __atomic_fetch_or_*, __atomic_fetch_xor_*, __atomic_xor_fetch_* */
(define_operator_list ATOMIC_FETCH_OR_XOR_N
BUILT_IN_ATOMIC_FETCH_OR_1 BUILT_IN_ATOMIC_FETCH_OR_2
BUILT_IN_ATOMIC_FETCH_OR_4 BUILT_IN_ATOMIC_FETCH_OR_8
BUILT_IN_ATOMIC_FETCH_OR_16
BUILT_IN_ATOMIC_FETCH_XOR_1 BUILT_IN_ATOMIC_FETCH_XOR_2
BUILT_IN_ATOMIC_FETCH_XOR_4 BUILT_IN_ATOMIC_FETCH_XOR_8
BUILT_IN_ATOMIC_FETCH_XOR_16
BUILT_IN_ATOMIC_XOR_FETCH_1 BUILT_IN_ATOMIC_XOR_FETCH_2
BUILT_IN_ATOMIC_XOR_FETCH_4 BUILT_IN_ATOMIC_XOR_FETCH_8
BUILT_IN_ATOMIC_XOR_FETCH_16)
/* __sync_fetch_and_or_*, __sync_fetch_and_xor_*, __sync_xor_and_fetch_* */
(define_operator_list SYNC_FETCH_OR_XOR_N
BUILT_IN_SYNC_FETCH_AND_OR_1 BUILT_IN_SYNC_FETCH_AND_OR_2
BUILT_IN_SYNC_FETCH_AND_OR_4 BUILT_IN_SYNC_FETCH_AND_OR_8
BUILT_IN_SYNC_FETCH_AND_OR_16
BUILT_IN_SYNC_FETCH_AND_XOR_1 BUILT_IN_SYNC_FETCH_AND_XOR_2
BUILT_IN_SYNC_FETCH_AND_XOR_4 BUILT_IN_SYNC_FETCH_AND_XOR_8
BUILT_IN_SYNC_FETCH_AND_XOR_16
BUILT_IN_SYNC_XOR_AND_FETCH_1 BUILT_IN_SYNC_XOR_AND_FETCH_2
BUILT_IN_SYNC_XOR_AND_FETCH_4 BUILT_IN_SYNC_XOR_AND_FETCH_8
BUILT_IN_SYNC_XOR_AND_FETCH_16)
/* __atomic_fetch_and_*. */
(define_operator_list ATOMIC_FETCH_AND_N
BUILT_IN_ATOMIC_FETCH_AND_1 BUILT_IN_ATOMIC_FETCH_AND_2
BUILT_IN_ATOMIC_FETCH_AND_4 BUILT_IN_ATOMIC_FETCH_AND_8
BUILT_IN_ATOMIC_FETCH_AND_16)
/* __sync_fetch_and_and_*. */
(define_operator_list SYNC_FETCH_AND_AND_N
BUILT_IN_SYNC_FETCH_AND_AND_1 BUILT_IN_SYNC_FETCH_AND_AND_2
BUILT_IN_SYNC_FETCH_AND_AND_4 BUILT_IN_SYNC_FETCH_AND_AND_8
BUILT_IN_SYNC_FETCH_AND_AND_16)
/* With nop_convert? combine convert? and view_convert? in one pattern
plus conditionalize on tree_nop_conversion_p conversions. */
(match (nop_convert @0)
(convert @0)
(if (tree_nop_conversion_p (type, TREE_TYPE (@0)))))
(match (nop_convert @0)
(view_convert @0)
(if (VECTOR_TYPE_P (type) && VECTOR_TYPE_P (TREE_TYPE (@0))
&& known_eq (TYPE_VECTOR_SUBPARTS (type),
TYPE_VECTOR_SUBPARTS (TREE_TYPE (@0)))
&& tree_nop_conversion_p (TREE_TYPE (type), TREE_TYPE (TREE_TYPE (@0))))))
/* Transform likes of (char) ABS_EXPR <(int) x> into (char) ABSU_EXPR <x>
ABSU_EXPR returns unsigned absolute value of the operand and the operand
of the ABSU_EXPR will have the corresponding signed type. */
(simplify (abs (convert @0))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& !TYPE_UNSIGNED (TREE_TYPE (@0))
&& element_precision (type) > element_precision (TREE_TYPE (@0)))
(with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
(convert (absu:utype @0)))))
#if GIMPLE
/* Optimize (X + (X >> (prec - 1))) ^ (X >> (prec - 1)) into abs (X). */
(simplify
(bit_xor:c (plus:c @0 (rshift@2 @0 INTEGER_CST@1)) @2)
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& !TYPE_UNSIGNED (TREE_TYPE (@0))
&& wi::to_widest (@1) == element_precision (TREE_TYPE (@0)) - 1)
(abs @0)))
#endif
/* Simplifications of operations with one constant operand and
simplifications to constants or single values. */
(for op (plus pointer_plus minus bit_ior bit_xor)
(simplify
(op @0 integer_zerop)
(non_lvalue @0)))
/* 0 +p index -> (type)index */
(simplify
(pointer_plus integer_zerop @1)
(non_lvalue (convert @1)))
/* ptr - 0 -> (type)ptr */
(simplify
(pointer_diff @0 integer_zerop)
(convert @0))
/* See if ARG1 is zero and X + ARG1 reduces to X.
Likewise if the operands are reversed. */
(simplify
(plus:c @0 real_zerop@1)
(if (fold_real_zero_addition_p (type, @0, @1, 0))
(non_lvalue @0)))
/* See if ARG1 is zero and X - ARG1 reduces to X. */
(simplify
(minus @0 real_zerop@1)
(if (fold_real_zero_addition_p (type, @0, @1, 1))
(non_lvalue @0)))
/* Even if the fold_real_zero_addition_p can't simplify X + 0.0
into X, we can optimize (X + 0.0) + 0.0 or (X + 0.0) - 0.0
or (X - 0.0) + 0.0 into X + 0.0 and (X - 0.0) - 0.0 into X - 0.0
if not -frounding-math. For sNaNs the first operation would raise
exceptions but turn the result into qNan, so the second operation
would not raise it. */
(for inner_op (plus minus)
(for outer_op (plus minus)
(simplify
(outer_op (inner_op@3 @0 REAL_CST@1) REAL_CST@2)
(if (real_zerop (@1)
&& real_zerop (@2)
&& !HONOR_SIGN_DEPENDENT_ROUNDING (type))
(with { bool inner_plus = ((inner_op == PLUS_EXPR)
^ REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (@1)));
bool outer_plus
= ((outer_op == PLUS_EXPR)
^ REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (@2))); }
(if (outer_plus && !inner_plus)
(outer_op @0 @2)
@3))))))
/* Simplify x - x.
This is unsafe for certain floats even in non-IEEE formats.
In IEEE, it is unsafe because it does wrong for NaNs.
PR middle-end/98420: x - x may be -0.0 with FE_DOWNWARD.
Also note that operand_equal_p is always false if an operand
is volatile. */
(simplify
(minus @0 @0)
(if (!FLOAT_TYPE_P (type)
|| (!tree_expr_maybe_nan_p (@0)
&& !tree_expr_maybe_infinite_p (@0)
&& (!HONOR_SIGN_DEPENDENT_ROUNDING (type)
|| !HONOR_SIGNED_ZEROS (type))))
{ build_zero_cst (type); }))
(simplify
(pointer_diff @@0 @0)
{ build_zero_cst (type); })
(simplify
(mult @0 integer_zerop@1)
@1)
/* -x == x -> x == 0 */
(for cmp (eq ne)
(simplify
(cmp:c @0 (negate @0))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& !TYPE_OVERFLOW_WRAPS (TREE_TYPE(@0)))
(cmp @0 { build_zero_cst (TREE_TYPE(@0)); }))))
/* Maybe fold x * 0 to 0. The expressions aren't the same
when x is NaN, since x * 0 is also NaN. Nor are they the
same in modes with signed zeros, since multiplying a
negative value by 0 gives -0, not +0. Nor when x is +-Inf,
since x * 0 is NaN. */
(simplify
(mult @0 real_zerop@1)
(if (!tree_expr_maybe_nan_p (@0)
&& (!HONOR_NANS (type) || !tree_expr_maybe_infinite_p (@0))
&& (!HONOR_SIGNED_ZEROS (type) || tree_expr_nonnegative_p (@0)))
@1))
/* In IEEE floating point, x*1 is not equivalent to x for snans.
Likewise for complex arithmetic with signed zeros. */
(simplify
(mult @0 real_onep)
(if (!tree_expr_maybe_signaling_nan_p (@0)
&& (!HONOR_SIGNED_ZEROS (type)
|| !COMPLEX_FLOAT_TYPE_P (type)))
(non_lvalue @0)))
/* Transform x * -1.0 into -x. */
(simplify
(mult @0 real_minus_onep)
(if (!tree_expr_maybe_signaling_nan_p (@0)
&& (!HONOR_SIGNED_ZEROS (type)
|| !COMPLEX_FLOAT_TYPE_P (type)))
(negate @0)))
/* Transform { 0 or 1 } * { 0 or 1 } into { 0 or 1 } & { 0 or 1 } */
(simplify
(mult SSA_NAME@1 SSA_NAME@2)
(if (INTEGRAL_TYPE_P (type)
&& get_nonzero_bits (@1) == 1
&& get_nonzero_bits (@2) == 1)
(bit_and @1 @2)))
/* Transform x * { 0 or 1, 0 or 1, ... } into x & { 0 or -1, 0 or -1, ...},
unless the target has native support for the former but not the latter. */
(simplify
(mult @0 VECTOR_CST@1)
(if (initializer_each_zero_or_onep (@1)
&& !HONOR_SNANS (type)
&& !HONOR_SIGNED_ZEROS (type))
(with { tree itype = FLOAT_TYPE_P (type) ? unsigned_type_for (type) : type; }
(if (itype
&& (!VECTOR_MODE_P (TYPE_MODE (type))
|| (VECTOR_MODE_P (TYPE_MODE (itype))
&& optab_handler (and_optab,
TYPE_MODE (itype)) != CODE_FOR_nothing)))
(view_convert (bit_and:itype (view_convert @0)
(ne @1 { build_zero_cst (type); })))))))
(for cmp (gt ge lt le)
outp (convert convert negate negate)
outn (negate negate convert convert)
/* Transform X * (X > 0.0 ? 1.0 : -1.0) into abs(X). */
/* Transform X * (X >= 0.0 ? 1.0 : -1.0) into abs(X). */
/* Transform X * (X < 0.0 ? 1.0 : -1.0) into -abs(X). */
/* Transform X * (X <= 0.0 ? 1.0 : -1.0) into -abs(X). */
(simplify
(mult:c @0 (cond (cmp @0 real_zerop) real_onep@1 real_minus_onep))
(if (!tree_expr_maybe_nan_p (@0) && !HONOR_SIGNED_ZEROS (type))
(outp (abs @0))))
/* Transform X * (X > 0.0 ? -1.0 : 1.0) into -abs(X). */
/* Transform X * (X >= 0.0 ? -1.0 : 1.0) into -abs(X). */
/* Transform X * (X < 0.0 ? -1.0 : 1.0) into abs(X). */
/* Transform X * (X <= 0.0 ? -1.0 : 1.0) into abs(X). */
(simplify
(mult:c @0 (cond (cmp @0 real_zerop) real_minus_onep real_onep@1))
(if (!tree_expr_maybe_nan_p (@0) && !HONOR_SIGNED_ZEROS (type))
(outn (abs @0)))))
/* Transform X * copysign (1.0, X) into abs(X). */
(simplify
(mult:c @0 (COPYSIGN_ALL real_onep @0))
(if (!tree_expr_maybe_nan_p (@0) && !HONOR_SIGNED_ZEROS (type))
(abs @0)))
/* Transform X * copysign (1.0, -X) into -abs(X). */
(simplify
(mult:c @0 (COPYSIGN_ALL real_onep (negate @0)))
(if (!tree_expr_maybe_nan_p (@0) && !HONOR_SIGNED_ZEROS (type))
(negate (abs @0))))
/* Transform copysign (CST, X) into copysign (ABS(CST), X). */
(simplify
(COPYSIGN_ALL REAL_CST@0 @1)
(if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (@0)))
(COPYSIGN_ALL (negate @0) @1)))
/* X * 1, X / 1 -> X. */
(for op (mult trunc_div ceil_div floor_div round_div exact_div)
(simplify
(op @0 integer_onep)
(non_lvalue @0)))
/* (A / (1 << B)) -> (A >> B).
Only for unsigned A. For signed A, this would not preserve rounding
toward zero.
For example: (-1 / ( 1 << B)) != -1 >> B.
Also also widening conversions, like:
(A / (unsigned long long) (1U << B)) -> (A >> B)
or
(A / (unsigned long long) (1 << B)) -> (A >> B).
If the left shift is signed, it can be done only if the upper bits
of A starting from shift's type sign bit are zero, as
(unsigned long long) (1 << 31) is -2147483648ULL, not 2147483648ULL,
so it is valid only if A >> 31 is zero. */
(simplify
(trunc_div (convert?@0 @3) (convert2? (lshift integer_onep@1 @2)))
(if ((TYPE_UNSIGNED (type) || tree_expr_nonnegative_p (@0))
&& (!VECTOR_TYPE_P (type)
|| target_supports_op_p (type, RSHIFT_EXPR, optab_vector)
|| target_supports_op_p (type, RSHIFT_EXPR, optab_scalar))
&& (useless_type_conversion_p (type, TREE_TYPE (@1))
|| (element_precision (type) >= element_precision (TREE_TYPE (@1))
&& (TYPE_UNSIGNED (TREE_TYPE (@1))
|| (element_precision (type)
== element_precision (TREE_TYPE (@1)))
|| (INTEGRAL_TYPE_P (type)
&& (tree_nonzero_bits (@0)
& wi::mask (element_precision (TREE_TYPE (@1)) - 1,
true,
element_precision (type))) == 0)))))
(if (!VECTOR_TYPE_P (type)
&& useless_type_conversion_p (TREE_TYPE (@3), TREE_TYPE (@1))
&& element_precision (TREE_TYPE (@3)) < element_precision (type))
(convert (rshift @3 @2))
(rshift @0 @2))))
/* Preserve explicit divisions by 0: the C++ front-end wants to detect
undefined behavior in constexpr evaluation, and assuming that the division
traps enables better optimizations than these anyway. */
(for div (trunc_div ceil_div floor_div round_div exact_div)
/* 0 / X is always zero. */
(simplify
(div integer_zerop@0 @1)
/* But not for 0 / 0 so that we can get the proper warnings and errors. */
(if (!integer_zerop (@1))
@0))
/* X / -1 is -X. */
(simplify
(div @0 integer_minus_onep@1)
(if (!TYPE_UNSIGNED (type))
(negate @0)))
/* X / bool_range_Y is X. */
(simplify
(div @0 SSA_NAME@1)
(if (INTEGRAL_TYPE_P (type)
&& ssa_name_has_boolean_range (@1)
&& !flag_non_call_exceptions)
@0))
/* X / X is one. */
(simplify
(div @0 @0)
/* But not for 0 / 0 so that we can get the proper warnings and errors.
And not for _Fract types where we can't build 1. */
(if (!ALL_FRACT_MODE_P (TYPE_MODE (type))
&& !integer_zerop (@0)
&& (!flag_non_call_exceptions || tree_expr_nonzero_p (@0)))
{ build_one_cst (type); }))
/* X / abs (X) is X < 0 ? -1 : 1. */
(simplify
(div:C @0 (abs @0))
(if (INTEGRAL_TYPE_P (type)
&& TYPE_OVERFLOW_UNDEFINED (type)
&& !integer_zerop (@0)
&& (!flag_non_call_exceptions || tree_expr_nonzero_p (@0)))
(cond (lt @0 { build_zero_cst (type); })
{ build_minus_one_cst (type); } { build_one_cst (type); })))
/* X / -X is -1. */
(simplify
(div:C @0 (negate @0))
(if ((INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
&& TYPE_OVERFLOW_UNDEFINED (type)
&& !integer_zerop (@0)
&& (!flag_non_call_exceptions || tree_expr_nonzero_p (@0)))
{ build_minus_one_cst (type); })))
/* For unsigned integral types, FLOOR_DIV_EXPR is the same as
TRUNC_DIV_EXPR. Rewrite into the latter in this case. Similarly
for MOD instead of DIV. */
(for floor_divmod (floor_div floor_mod)
trunc_divmod (trunc_div trunc_mod)
(simplify
(floor_divmod @0 @1)
(if ((INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
&& TYPE_UNSIGNED (type))
(trunc_divmod @0 @1))))
/* 1 / X -> X == 1 for unsigned integer X.
1 / X -> X >= -1 && X <= 1 ? X : 0 for signed integer X.
But not for 1 / 0 so that we can get proper warnings and errors,
and not for 1-bit integers as they are edge cases better handled
elsewhere. */
(simplify
(trunc_div integer_onep@0 @1)
(if (INTEGRAL_TYPE_P (type)
&& TYPE_PRECISION (type) > 1
&& !integer_zerop (@1)
&& (!flag_non_call_exceptions || tree_expr_nonzero_p (@1)))
(if (TYPE_UNSIGNED (type))
(convert (eq:boolean_type_node @1 { build_one_cst (type); }))
(with { tree utype = unsigned_type_for (type); }
(cond (le (plus (convert:utype @1) { build_one_cst (utype); })
{ build_int_cst (utype, 2); })
@1 { build_zero_cst (type); })))))
/* Combine two successive divisions. Note that combining ceil_div
and floor_div is trickier and combining round_div even more so. */
(for div (trunc_div exact_div)
(simplify
(div (div@3 @0 INTEGER_CST@1) INTEGER_CST@2)
(with {
wi::overflow_type overflow;
wide_int mul = wi::mul (wi::to_wide (@1), wi::to_wide (@2),
TYPE_SIGN (type), &overflow);
}
(if (div == EXACT_DIV_EXPR
|| optimize_successive_divisions_p (@2, @3))
(if (!overflow)
(div @0 { wide_int_to_tree (type, mul); })
(if (TYPE_UNSIGNED (type)
|| mul != wi::min_value (TYPE_PRECISION (type), SIGNED))
{ build_zero_cst (type); }))))))
/* Combine successive multiplications. Similar to above, but handling
overflow is different. */
(simplify
(mult (mult @0 INTEGER_CST@1) INTEGER_CST@2)
(with {
wi::overflow_type overflow;
wide_int mul = wi::mul (wi::to_wide (@1), wi::to_wide (@2),
TYPE_SIGN (type), &overflow);
}
/* Skip folding on overflow: the only special case is @1 * @2 == -INT_MIN,
otherwise undefined overflow implies that @0 must be zero. */
(if (!overflow || TYPE_OVERFLOW_WRAPS (type))
(mult @0 { wide_int_to_tree (type, mul); }))))
/* Optimize A / A to 1.0 if we don't care about
NaNs or Infinities. */
(simplify
(rdiv @0 @0)
(if (FLOAT_TYPE_P (type)
&& ! HONOR_NANS (type)
&& ! HONOR_INFINITIES (type))
{ build_one_cst (type); }))
/* Optimize -A / A to -1.0 if we don't care about
NaNs or Infinities. */
(simplify
(rdiv:C @0 (negate @0))
(if (FLOAT_TYPE_P (type)
&& ! HONOR_NANS (type)
&& ! HONOR_INFINITIES (type))
{ build_minus_one_cst (type); }))
/* PR71078: x / abs(x) -> copysign (1.0, x) */
(simplify
(rdiv:C (convert? @0) (convert? (abs @0)))
(if (SCALAR_FLOAT_TYPE_P (type)
&& ! HONOR_NANS (type)
&& ! HONOR_INFINITIES (type))
(switch
(if (types_match (type, float_type_node))
(BUILT_IN_COPYSIGNF { build_one_cst (type); } (convert @0)))
(if (types_match (type, double_type_node))
(BUILT_IN_COPYSIGN { build_one_cst (type); } (convert @0)))
(if (types_match (type, long_double_type_node))
(BUILT_IN_COPYSIGNL { build_one_cst (type); } (convert @0))))))
/* In IEEE floating point, x/1 is not equivalent to x for snans. */
(simplify
(rdiv @0 real_onep)
(if (!tree_expr_maybe_signaling_nan_p (@0))
(non_lvalue @0)))
/* In IEEE floating point, x/-1 is not equivalent to -x for snans. */
(simplify
(rdiv @0 real_minus_onep)
(if (!tree_expr_maybe_signaling_nan_p (@0))
(negate @0)))
(if (flag_reciprocal_math)
/* Convert (A/B)/C to A/(B*C). */
(simplify
(rdiv (rdiv:s @0 @1) @2)
(rdiv @0 (mult @1 @2)))
/* Canonicalize x / (C1 * y) to (x * C2) / y. */
(simplify
(rdiv @0 (mult:s @1 REAL_CST@2))
(with
{ tree tem = const_binop (RDIV_EXPR, type, build_one_cst (type), @2); }
(if (tem)
(rdiv (mult @0 { tem; } ) @1))))
/* Convert A/(B/C) to (A/B)*C */
(simplify
(rdiv @0 (rdiv:s @1 @2))
(mult (rdiv @0 @1) @2)))
/* Simplify x / (- y) to -x / y. */
(simplify
(rdiv @0 (negate @1))
(rdiv (negate @0) @1))
(if (flag_unsafe_math_optimizations)
/* Simplify (C / x op 0.0) to x op 0.0 for C != 0, C != Inf/Nan.
Since C / x may underflow to zero, do this only for unsafe math. */
(for op (lt le gt ge)
neg_op (gt ge lt le)
(simplify
(op (rdiv REAL_CST@0 @1) real_zerop@2)
(if (!HONOR_SIGNED_ZEROS (@1) && !HONOR_INFINITIES (@1))
(switch
(if (real_less (&dconst0, TREE_REAL_CST_PTR (@0)))
(op @1 @2))
/* For C < 0, use the inverted operator. */
(if (real_less (TREE_REAL_CST_PTR (@0), &dconst0))
(neg_op @1 @2)))))))
/* Optimize (X & (-A)) / A where A is a power of 2, to X >> log2(A) */
(for div (trunc_div ceil_div floor_div round_div exact_div)
(simplify
(div (convert? (bit_and @0 INTEGER_CST@1)) INTEGER_CST@2)
(if (integer_pow2p (@2)
&& tree_int_cst_sgn (@2) > 0
&& tree_nop_conversion_p (type, TREE_TYPE (@0))
&& wi::to_wide (@2) + wi::to_wide (@1) == 0)
(rshift (convert @0)
{ build_int_cst (integer_type_node,
wi::exact_log2 (wi::to_wide (@2))); }))))
/* If ARG1 is a constant, we can convert this to a multiply by the
reciprocal. This does not have the same rounding properties,
so only do this if -freciprocal-math. We can actually
always safely do it if ARG1 is a power of two, but it's hard to
tell if it is or not in a portable manner. */
(for cst (REAL_CST COMPLEX_CST VECTOR_CST)
(simplify
(rdiv @0 cst@1)
(if (optimize)
(if (flag_reciprocal_math
&& !real_zerop (@1))
(with
{ tree tem = const_binop (RDIV_EXPR, type, build_one_cst (type), @1); }
(if (tem)
(mult @0 { tem; } )))
(if (cst != COMPLEX_CST)
(with { tree inverse = exact_inverse (type, @1); }
(if (inverse)
(mult @0 { inverse; } ))))))))
(for mod (ceil_mod floor_mod round_mod trunc_mod)
/* 0 % X is always zero. */
(simplify
(mod integer_zerop@0 @1)
/* But not for 0 % 0 so that we can get the proper warnings and errors. */
(if (!integer_zerop (@1))
@0))
/* X % 1 is always zero. */
(simplify
(mod @0 integer_onep)
{ build_zero_cst (type); })
/* X % -1 is zero. */
(simplify
(mod @0 integer_minus_onep@1)
(if (!TYPE_UNSIGNED (type))
{ build_zero_cst (type); }))
/* X % X is zero. */
(simplify
(mod @0 @0)
/* But not for 0 % 0 so that we can get the proper warnings and errors. */
(if (!integer_zerop (@0))
{ build_zero_cst (type); }))
/* (X % Y) % Y is just X % Y. */
(simplify
(mod (mod@2 @0 @1) @1)
@2)
/* From extract_muldiv_1: (X * C1) % C2 is zero if C1 is a multiple of C2. */
(simplify
(mod (mult @0 INTEGER_CST@1) INTEGER_CST@2)
(if (ANY_INTEGRAL_TYPE_P (type)
&& TYPE_OVERFLOW_UNDEFINED (type)
&& wi::multiple_of_p (wi::to_wide (@1), wi::to_wide (@2),
TYPE_SIGN (type)))
{ build_zero_cst (type); }))
/* For (X % C) == 0, if X is signed and C is power of 2, use unsigned
modulo and comparison, since it is simpler and equivalent. */
(for cmp (eq ne)
(simplify
(cmp (mod @0 integer_pow2p@2) integer_zerop@1)
(if (!TYPE_UNSIGNED (TREE_TYPE (@0)))
(with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
(cmp (mod (convert:utype @0) (convert:utype @2)) (convert:utype @1)))))))
/* X % -C is the same as X % C. */
(simplify
(trunc_mod @0 INTEGER_CST@1)
(if (TYPE_SIGN (type) == SIGNED
&& !TREE_OVERFLOW (@1)
&& wi::neg_p (wi::to_wide (@1))
&& !TYPE_OVERFLOW_TRAPS (type)
/* Avoid this transformation if C is INT_MIN, i.e. C == -C. */
&& !sign_bit_p (@1, @1))
(trunc_mod @0 (negate @1))))
/* X % -Y is the same as X % Y. */
(simplify
(trunc_mod @0 (convert? (negate @1)))
(if (INTEGRAL_TYPE_P (type)
&& !TYPE_UNSIGNED (type)
&& !TYPE_OVERFLOW_TRAPS (type)
&& tree_nop_conversion_p (type, TREE_TYPE (@1))
/* Avoid this transformation if X might be INT_MIN or
Y might be -1, because we would then change valid
INT_MIN % -(-1) into invalid INT_MIN % -1. */
&& (expr_not_equal_to (@0, wi::to_wide (TYPE_MIN_VALUE (type)))
|| expr_not_equal_to (@1, wi::minus_one (TYPE_PRECISION
(TREE_TYPE (@1))))))
(trunc_mod @0 (convert @1))))
/* X - (X / Y) * Y is the same as X % Y. */
(simplify
(minus (convert1? @0) (convert2? (mult:c (trunc_div @@0 @@1) @1)))
(if (INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
(convert (trunc_mod @0 @1))))
/* x * (1 + y / x) - y -> x - y % x */
(simplify
(minus (mult:cs @0 (plus:s (trunc_div:s @1 @0) integer_onep)) @1)
(if (INTEGRAL_TYPE_P (type))
(minus @0 (trunc_mod @1 @0))))
/* Optimize TRUNC_MOD_EXPR by a power of two into a BIT_AND_EXPR,
i.e. "X % C" into "X & (C - 1)", if X and C are positive.
Also optimize A % (C << N) where C is a power of 2,
to A & ((C << N) - 1).
Also optimize "A shift (B % C)", if C is a power of 2, to
"A shift (B & (C - 1))". SHIFT operation include "<<" and ">>"
and assume (B % C) is nonnegative as shifts negative values would
be UB. */
(match (power_of_two_cand @1)
INTEGER_CST@1)
(match (power_of_two_cand @1)
(lshift INTEGER_CST@1 @2))
(for mod (trunc_mod floor_mod)
(for shift (lshift rshift)
(simplify
(shift @0 (mod @1 (power_of_two_cand@2 @3)))
(if (integer_pow2p (@3) && tree_int_cst_sgn (@3) > 0)
(shift @0 (bit_and @1 (minus @2 { build_int_cst (TREE_TYPE (@2),
1); }))))))
(simplify
(mod @0 (convert? (power_of_two_cand@1 @2)))
(if ((TYPE_UNSIGNED (type) || tree_expr_nonnegative_p (@0))
/* Allow any integral conversions of the divisor, except
conversion from narrower signed to wider unsigned type
where if @1 would be negative power of two, the divisor
would not be a power of two. */
&& INTEGRAL_TYPE_P (type)
&& INTEGRAL_TYPE_P (TREE_TYPE (@1))
&& (TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@1))
|| TYPE_UNSIGNED (TREE_TYPE (@1))
|| !TYPE_UNSIGNED (type))
&& integer_pow2p (@2) && tree_int_cst_sgn (@2) > 0)
(with { tree utype = TREE_TYPE (@1);
if (!TYPE_OVERFLOW_WRAPS (utype))
utype = unsigned_type_for (utype); }
(bit_and @0 (convert (minus (convert:utype @1)
{ build_one_cst (utype); })))))))
/* Simplify (unsigned t * 2)/2 -> unsigned t & 0x7FFFFFFF. */
(simplify
(trunc_div (mult @0 integer_pow2p@1) @1)
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0)) && TYPE_UNSIGNED (TREE_TYPE (@0)))
(bit_and @0 { wide_int_to_tree
(type, wi::mask (TYPE_PRECISION (type)
- wi::exact_log2 (wi::to_wide (@1)),
false, TYPE_PRECISION (type))); })))
/* Simplify (unsigned t / 2) * 2 -> unsigned t & ~1. */
(simplify
(mult (trunc_div @0 integer_pow2p@1) @1)
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0)) && TYPE_UNSIGNED (TREE_TYPE (@0)))
(bit_and @0 (negate @1))))
/* Simplify (t * 2) / 2) -> t. */
(for div (trunc_div ceil_div floor_div round_div exact_div)
(simplify
(div (mult:c @0 @1) @1)
(if (ANY_INTEGRAL_TYPE_P (type))
(if (TYPE_OVERFLOW_UNDEFINED (type))
@0
#if GIMPLE
(with
{
bool overflowed = true;
value_range vr0, vr1;
if (INTEGRAL_TYPE_P (type)
&& get_global_range_query ()->range_of_expr (vr0, @0)
&& get_global_range_query ()->range_of_expr (vr1, @1)
&& vr0.kind () == VR_RANGE
&& vr1.kind () == VR_RANGE)
{
wide_int wmin0 = vr0.lower_bound ();
wide_int wmax0 = vr0.upper_bound ();
wide_int wmin1 = vr1.lower_bound ();
wide_int wmax1 = vr1.upper_bound ();
/* If the multiplication can't overflow/wrap around, then
it can be optimized too. */
wi::overflow_type min_ovf, max_ovf;
wi::mul (wmin0, wmin1, TYPE_SIGN (type), &min_ovf);
wi::mul (wmax0, wmax1, TYPE_SIGN (type), &max_ovf);
if (min_ovf == wi::OVF_NONE && max_ovf == wi::OVF_NONE)
{
wi::mul (wmin0, wmax1, TYPE_SIGN (type), &min_ovf);
wi::mul (wmax0, wmin1, TYPE_SIGN (type), &max_ovf);
if (min_ovf == wi::OVF_NONE && max_ovf == wi::OVF_NONE)
overflowed = false;
}
}
}
(if (!overflowed)
@0))
#endif
))))
(for op (negate abs)
/* Simplify cos(-x) and cos(|x|) -> cos(x). Similarly for cosh. */
(for coss (COS COSH)
(simplify
(coss (op @0))
(coss @0)))
/* Simplify pow(-x, y) and pow(|x|,y) -> pow(x,y) if y is an even integer. */
(for pows (POW)
(simplify
(pows (op @0) REAL_CST@1)
(with { HOST_WIDE_INT n; }
(if (real_isinteger (&TREE_REAL_CST (@1), &n) && (n & 1) == 0)
(pows @0 @1)))))
/* Likewise for powi. */
(for pows (POWI)
(simplify
(pows (op @0) INTEGER_CST@1)
(if ((wi::to_wide (@1) & 1) == 0)
(pows @0 @1))))
/* Strip negate and abs from both operands of hypot. */
(for hypots (HYPOT)
(simplify
(hypots (op @0) @1)
(hypots @0 @1))
(simplify
(hypots @0 (op @1))
(hypots @0 @1)))
/* copysign(-x, y) and copysign(abs(x), y) -> copysign(x, y). */
(for copysigns (COPYSIGN_ALL)
(simplify
(copysigns (op @0) @1)
(copysigns @0 @1))))
/* abs(x)*abs(x) -> x*x. Should be valid for all types. */
(simplify
(mult (abs@1 @0) @1)
(mult @0 @0))
/* Convert absu(x)*absu(x) -> x*x. */
(simplify
(mult (absu@1 @0) @1)
(mult (convert@2 @0) @2))
/* cos(copysign(x, y)) -> cos(x). Similarly for cosh. */
(for coss (COS COSH)
copysigns (COPYSIGN)
(simplify
(coss (copysigns @0 @1))
(coss @0)))
/* pow(copysign(x, y), z) -> pow(x, z) if z is an even integer. */
(for pows (POW)
copysigns (COPYSIGN)
(simplify
(pows (copysigns @0 @2) REAL_CST@1)
(with { HOST_WIDE_INT n; }
(if (real_isinteger (&TREE_REAL_CST (@1), &n) && (n & 1) == 0)
(pows @0 @1)))))
/* Likewise for powi. */
(for pows (POWI)
copysigns (COPYSIGN)
(simplify
(pows (copysigns @0 @2) INTEGER_CST@1)
(if ((wi::to_wide (@1) & 1) == 0)
(pows @0 @1))))
(for hypots (HYPOT)
copysigns (COPYSIGN)
/* hypot(copysign(x, y), z) -> hypot(x, z). */
(simplify
(hypots (copysigns @0 @1) @2)
(hypots @0 @2))
/* hypot(x, copysign(y, z)) -> hypot(x, y). */
(simplify
(hypots @0 (copysigns @1 @2))
(hypots @0 @1)))
/* copysign(x, CST) -> [-]abs (x). */
(for copysigns (COPYSIGN_ALL)
(simplify
(copysigns @0 REAL_CST@1)
(if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (@1)))
(negate (abs @0))
(abs @0))))
/* copysign(copysign(x, y), z) -> copysign(x, z). */
(for copysigns (COPYSIGN_ALL)
(simplify
(copysigns (copysigns @0 @1) @2)
(copysigns @0 @2)))
/* copysign(x,y)*copysign(x,y) -> x*x. */
(for copysigns (COPYSIGN_ALL)
(simplify
(mult (copysigns@2 @0 @1) @2)
(mult @0 @0)))
/* ccos(-x) -> ccos(x). Similarly for ccosh. */
(for ccoss (CCOS CCOSH)
(simplify
(ccoss (negate @0))
(ccoss @0)))
/* cabs(-x) and cos(conj(x)) -> cabs(x). */
(for ops (conj negate)
(for cabss (CABS)
(simplify
(cabss (ops @0))
(cabss @0))))
/* Fold (a * (1 << b)) into (a << b) */
(simplify
(mult:c @0 (convert? (lshift integer_onep@1 @2)))
(if (! FLOAT_TYPE_P (type)
&& tree_nop_conversion_p (type, TREE_TYPE (@1)))
(lshift @0 @2)))
/* Fold (1 << (C - x)) where C = precision(type) - 1
into ((1 << C) >> x). */
(simplify
(lshift integer_onep@0 (minus@1 INTEGER_CST@2 @3))
(if (INTEGRAL_TYPE_P (type)
&& wi::eq_p (wi::to_wide (@2), TYPE_PRECISION (type) - 1)
&& single_use (@1))
(if (TYPE_UNSIGNED (type))
(rshift (lshift @0 @2) @3)
(with
{ tree utype = unsigned_type_for (type); }
(convert (rshift (lshift (convert:utype @0) @2) @3))))))
/* Fold ((type)(a<0)) << SIGNBITOFA into ((type)a) & signbit. */
(simplify
(lshift (convert (lt @0 integer_zerop@1)) INTEGER_CST@2)
(if (TYPE_SIGN (TREE_TYPE (@0)) == SIGNED
&& wi::eq_p (wi::to_wide (@2), TYPE_PRECISION (TREE_TYPE (@0)) - 1))
(with { wide_int wone = wi::one (TYPE_PRECISION (type)); }
(bit_and (convert @0)
{ wide_int_to_tree (type,
wi::lshift (wone, wi::to_wide (@2))); }))))
/* Fold (-x >> C) into -(x > 0) where C = precision(type) - 1. */
(for cst (INTEGER_CST VECTOR_CST)
(simplify
(rshift (negate:s @0) cst@1)
(if (!TYPE_UNSIGNED (type)
&& TYPE_OVERFLOW_UNDEFINED (type))
(with { tree stype = TREE_TYPE (@1);
tree bt = truth_type_for (type);
tree zeros = build_zero_cst (type);
tree cst = NULL_TREE; }
(switch
/* Handle scalar case. */
(if (INTEGRAL_TYPE_P (type)
/* If we apply the rule to the scalar type before vectorization
we will enforce the result of the comparison being a bool
which will require an extra AND on the result that will be
indistinguishable from when the user did actually want 0
or 1 as the result so it can't be removed. */
&& canonicalize_math_after_vectorization_p ()
&& wi::eq_p (wi::to_wide (@1), TYPE_PRECISION (type) - 1))
(negate (convert (gt @0 { zeros; }))))
/* Handle vector case. */
(if (VECTOR_INTEGER_TYPE_P (type)
/* First check whether the target has the same mode for vector
comparison results as it's operands do. */
&& TYPE_MODE (bt) == TYPE_MODE (type)
/* Then check to see if the target is able to expand the comparison
with the given type later on, otherwise we may ICE. */
&& expand_vec_cmp_expr_p (type, bt, GT_EXPR)
&& (cst = uniform_integer_cst_p (@1)) != NULL
&& wi::eq_p (wi::to_wide (cst), element_precision (type) - 1))
(view_convert (gt:bt @0 { zeros; }))))))))
/* Fold (C1/X)*C2 into (C1*C2)/X. */
(simplify
(mult (rdiv@3 REAL_CST@0 @1) REAL_CST@2)
(if (flag_associative_math
&& single_use (@3))
(with
{ tree tem = const_binop (MULT_EXPR, type, @0, @2); }
(if (tem)
(rdiv { tem; } @1)))))
/* Simplify ~X & X as zero. */
(simplify
(bit_and:c (convert? @0) (convert? (bit_not @0)))
{ build_zero_cst (type); })
/* PR71636: Transform x & ((1U << b) - 1) -> x & ~(~0U << b); */
(simplify
(bit_and:c @0 (plus:s (lshift:s integer_onep @1) integer_minus_onep))
(if (TYPE_UNSIGNED (type))
(bit_and @0 (bit_not (lshift { build_all_ones_cst (type); } @1)))))
(for bitop (bit_and bit_ior)
cmp (eq ne)
/* PR35691: Transform
(x == 0 & y == 0) -> (x | typeof(x)(y)) == 0.
(x != 0 | y != 0) -> (x | typeof(x)(y)) != 0. */
(simplify
(bitop (cmp @0 integer_zerop@2) (cmp @1 integer_zerop))
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& INTEGRAL_TYPE_P (TREE_TYPE (@1))
&& TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1)))
(cmp (bit_ior @0 (convert @1)) @2)))
/* Transform:
(x == -1 & y == -1) -> (x & typeof(x)(y)) == -1.
(x != -1 | y != -1) -> (x & typeof(x)(y)) != -1. */
(simplify
(bitop (cmp @0 integer_all_onesp@2) (cmp @1 integer_all_onesp))
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& INTEGRAL_TYPE_P (TREE_TYPE (@1))
&& TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1)))
(cmp (bit_and @0 (convert @1)) @2))))
/* Fold (A & ~B) - (A & B) into (A ^ B) - B. */
(simplify
(minus (bit_and:cs @0 (bit_not @1)) (bit_and:cs @0 @1))
(minus (bit_xor @0 @1) @1))
(simplify
(minus (bit_and:s @0 INTEGER_CST@2) (bit_and:s @0 INTEGER_CST@1))
(if (~wi::to_wide (@2) == wi::to_wide (@1))
(minus (bit_xor @0 @1) @1)))
/* Fold (A & B) - (A & ~B) into B - (A ^ B). */
(simplify
(minus (bit_and:cs @0 @1) (bit_and:cs @0 (bit_not @1)))
(minus @1 (bit_xor @0 @1)))
/* Simplify (X & ~Y) |^+ (~X & Y) -> X ^ Y. */
(for op (bit_ior bit_xor plus)
(simplify
(op (bit_and:c @0 (bit_not @1)) (bit_and:c (bit_not @0) @1))
(bit_xor @0 @1))
(simplify
(op:c (bit_and @0 INTEGER_CST@2) (bit_and (bit_not @0) INTEGER_CST@1))
(if (~wi::to_wide (@2) == wi::to_wide (@1))
(bit_xor @0 @1))))
/* PR53979: Transform ((a ^ b) | a) -> (a | b) */
(simplify
(bit_ior:c (bit_xor:c @0 @1) @0)
(bit_ior @0 @1))
/* (a & ~b) | (a ^ b) --> a ^ b */
(simplify
(bit_ior:c (bit_and:c @0 (bit_not @1)) (bit_xor:c@2 @0 @1))
@2)
/* (a & ~b) ^ ~a --> ~(a & b) */
(simplify
(bit_xor:c (bit_and:cs @0 (bit_not @1)) (bit_not @0))
(bit_not (bit_and @0 @1)))
/* (~a & b) ^ a --> (a | b) */
(simplify
(bit_xor:c (bit_and:cs (bit_not @0) @1) @0)
(bit_ior @0 @1))
/* (a | b) & ~(a ^ b) --> a & b */
(simplify
(bit_and:c (bit_ior @0 @1) (bit_not (bit_xor:c @0 @1)))
(bit_and @0 @1))
/* a | ~(a ^ b) --> a | ~b */
(simplify
(bit_ior:c @0 (bit_not:s (bit_xor:c @0 @1)))
(bit_ior @0 (bit_not @1)))
/* (a | b) | (a &^ b) --> a | b */
(for op (bit_and bit_xor)
(simplify
(bit_ior:c (bit_ior@2 @0 @1) (op:c @0 @1))
@2))
/* (a & b) | ~(a ^ b) --> ~(a ^ b) */
(simplify
(bit_ior:c (bit_and:c @0 @1) (bit_not@2 (bit_xor @0 @1)))
@2)
/* ~(~a & b) --> a | ~b */
(simplify
(bit_not (bit_and:cs (bit_not @0) @1))
(bit_ior @0 (bit_not @1)))
/* ~(~a | b) --> a & ~b */
(simplify
(bit_not (bit_ior:cs (bit_not @0) @1))
(bit_and @0 (bit_not @1)))
/* (a ^ b) & ((b ^ c) ^ a) --> (a ^ b) & ~c */
(simplify
(bit_and:c (bit_xor:c@3 @0 @1) (bit_xor:cs (bit_xor:cs @1 @2) @0))
(bit_and @3 (bit_not @2)))
/* (a ^ b) | ((b ^ c) ^ a) --> (a ^ b) | c */
(simplify
(bit_ior:c (bit_xor:c@3 @0 @1) (bit_xor:c (bit_xor:c @1 @2) @0))
(bit_ior @3 @2))
#if GIMPLE
/* (~X | C) ^ D -> (X | C) ^ (~D ^ C) if (~D ^ C) can be simplified. */
(simplify
(bit_xor:c (bit_ior:cs (bit_not:s @0) @1) @2)
(bit_xor (bit_ior @0 @1) (bit_xor! (bit_not! @2) @1)))
/* (~X & C) ^ D -> (X & C) ^ (D ^ C) if (D ^ C) can be simplified. */
(simplify
(bit_xor:c (bit_and:cs (bit_not:s @0) @1) @2)
(bit_xor (bit_and @0 @1) (bit_xor! @2 @1)))
/* Simplify (~X & Y) to X ^ Y if we know that (X & ~Y) is 0. */
(simplify
(bit_and (bit_not SSA_NAME@0) INTEGER_CST@1)
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& wi::bit_and_not (get_nonzero_bits (@0), wi::to_wide (@1)) == 0)
(bit_xor @0 @1)))
#endif
/* For constants M and N, if M == (1LL << cst) - 1 && (N & M) == M,
((A & N) + B) & M -> (A + B) & M
Similarly if (N & M) == 0,
((A | N) + B) & M -> (A + B) & M
and for - instead of + (or unary - instead of +)
and/or ^ instead of |.
If B is constant and (B & M) == 0, fold into A & M. */
(for op (plus minus)
(for bitop (bit_and bit_ior bit_xor)
(simplify
(bit_and (op:s (bitop:s@0 @3 INTEGER_CST@4) @1) INTEGER_CST@2)
(with
{ tree pmop[2];
tree utype = fold_bit_and_mask (TREE_TYPE (@0), @2, op, @0, bitop,
@3, @4, @1, ERROR_MARK, NULL_TREE,
NULL_TREE, pmop); }
(if (utype)
(convert (bit_and (op (convert:utype { pmop[0]; })
(convert:utype { pmop[1]; }))
(convert:utype @2))))))
(simplify
(bit_and (op:s @0 (bitop:s@1 @3 INTEGER_CST@4)) INTEGER_CST@2)
(with
{ tree pmop[2];
tree utype = fold_bit_and_mask (TREE_TYPE (@0), @2, op, @0, ERROR_MARK,
NULL_TREE, NULL_TREE, @1, bitop, @3,
@4, pmop); }
(if (utype)
(convert (bit_and (op (convert:utype { pmop[0]; })
(convert:utype { pmop[1]; }))
(convert:utype @2)))))))
(simplify
(bit_and (op:s @0 @1) INTEGER_CST@2)
(with
{ tree pmop[2];
tree utype = fold_bit_and_mask (TREE_TYPE (@0), @2, op, @0, ERROR_MARK,
NULL_TREE, NULL_TREE, @1, ERROR_MARK,
NULL_TREE, NULL_TREE, pmop); }
(if (utype)
(convert (bit_and (op (convert:utype { pmop[0]; })
(convert:utype { pmop[1]; }))
(convert:utype @2)))))))
(for bitop (bit_and bit_ior bit_xor)
(simplify
(bit_and (negate:s (bitop:s@0 @2 INTEGER_CST@3)) INTEGER_CST@1)
(with
{ tree pmop[2];
tree utype = fold_bit_and_mask (TREE_TYPE (@0), @1, NEGATE_EXPR, @0,
bitop, @2, @3, NULL_TREE, ERROR_MARK,
NULL_TREE, NULL_TREE, pmop); }
(if (utype)
(convert (bit_and (negate (convert:utype { pmop[0]; }))
(convert:utype @1)))))))
/* X % Y is smaller than Y. */
(for cmp (lt ge)
(simplify
(cmp (trunc_mod @0 @1) @1)
(if (TYPE_UNSIGNED (TREE_TYPE (@0)))
{ constant_boolean_node (cmp == LT_EXPR, type); })))
(for cmp (gt le)
(simplify
(cmp @1 (trunc_mod @0 @1))
(if (TYPE_UNSIGNED (TREE_TYPE (@0)))
{ constant_boolean_node (cmp == GT_EXPR, type); })))
/* x | ~0 -> ~0 */
(simplify
(bit_ior @0 integer_all_onesp@1)
@1)
/* x | 0 -> x */
(simplify
(bit_ior @0 integer_zerop)
@0)
/* x & 0 -> 0 */
(simplify
(bit_and @0 integer_zerop@1)
@1)
/* ~x | x -> -1 */
/* ~x ^ x -> -1 */
/* ~x + x -> -1 */
(for op (bit_ior bit_xor plus)
(simplify
(op:c (convert? @0) (convert? (bit_not @0)))
(convert { build_all_ones_cst (TREE_TYPE (@0)); })))
/* x ^ x -> 0 */
(simplify
(bit_xor @0 @0)
{ build_zero_cst (type); })
/* Canonicalize X ^ ~0 to ~X. */
(simplify
(bit_xor @0 integer_all_onesp@1)
(bit_not @0))
/* x & ~0 -> x */
(simplify
(bit_and @0 integer_all_onesp)
(non_lvalue @0))
/* x & x -> x, x | x -> x */
(for bitop (bit_and bit_ior)
(simplify
(bitop @0 @0)
(non_lvalue @0)))
/* x & C -> x if we know that x & ~C == 0. */
#if GIMPLE
(simplify
(bit_and SSA_NAME@0 INTEGER_CST@1)
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& wi::bit_and_not (get_nonzero_bits (@0), wi::to_wide (@1)) == 0)
@0))
#endif
/* ~(~X - Y) -> X + Y and ~(~X + Y) -> X - Y. */
(simplify
(bit_not (minus (bit_not @0) @1))
(plus @0 @1))
(simplify
(bit_not (plus:c (bit_not @0) @1))
(minus @0 @1))
/* ~(X - Y) -> ~X + Y. */
(simplify
(bit_not (minus:s @0 @1))
(plus (bit_not @0) @1))
(simplify
(bit_not (plus:s @0 INTEGER_CST@1))
(if ((INTEGRAL_TYPE_P (type)
&& TYPE_UNSIGNED (type))
|| (!TYPE_OVERFLOW_SANITIZED (type)
&& may_negate_without_overflow_p (@1)))
(plus (bit_not @0) { const_unop (NEGATE_EXPR, type, @1); })))
#if GIMPLE
/* ~X + Y -> (Y - X) - 1. */
(simplify
(plus:c (bit_not @0) @1)
(if (ANY_INTEGRAL_TYPE_P (type)
&& TYPE_OVERFLOW_WRAPS (type)
/* -1 - X is folded to ~X, so we'd recurse endlessly. */
&& !integer_all_onesp (@1))
(plus (minus @1 @0) { build_minus_one_cst (type); })
(if (INTEGRAL_TYPE_P (type)
&& TREE_CODE (@1) == INTEGER_CST
&& wi::to_wide (@1) != wi::min_value (TYPE_PRECISION (type),
SIGNED))
(minus (plus @1 { build_minus_one_cst (type); }) @0))))
/* ~(X >> Y) -> ~X >> Y if ~X can be simplified. */
(simplify
(bit_not (rshift:s @0 @1))
(if (!TYPE_UNSIGNED (TREE_TYPE (@0)))
(rshift (bit_not! @0) @1)
/* For logical right shifts, this is possible only if @0 doesn't
have MSB set and the logical right shift is changed into
arithmetic shift. */
(if (!wi::neg_p (tree_nonzero_bits (@0)))
(with { tree stype = signed_type_for (TREE_TYPE (@0)); }
(convert (rshift (bit_not! (convert:stype @0)) @1))))))
#endif
/* x + (x & 1) -> (x + 1) & ~1 */
(simplify
(plus:c @0 (bit_and:s @0 integer_onep@1))
(bit_and (plus @0 @1) (bit_not @1)))
/* x & ~(x & y) -> x & ~y */
/* x | ~(x | y) -> x | ~y */
(for bitop (bit_and bit_ior)
(simplify
(bitop:c @0 (bit_not (bitop:cs @0 @1)))
(bitop @0 (bit_not @1))))
/* (~x & y) | ~(x | y) -> ~x */
(simplify
(bit_ior:c (bit_and:c (bit_not@2 @0) @1) (bit_not (bit_ior:c @0 @1)))
@2)
/* (x | y) ^ (x | ~y) -> ~x */
(simplify
(bit_xor:c (bit_ior:c @0 @1) (bit_ior:c @0 (bit_not @1)))
(bit_not @0))
/* (x & y) | ~(x | y) -> ~(x ^ y) */
(simplify
(bit_ior:c (bit_and:s @0 @1) (bit_not:s (bit_ior:s @0 @1)))
(bit_not (bit_xor @0 @1)))
/* (~x | y) ^ (x ^ y) -> x | ~y */
(simplify
(bit_xor:c (bit_ior:cs (bit_not @0) @1) (bit_xor:s @0 @1))
(bit_ior @0 (bit_not @1)))
/* (x ^ y) | ~(x | y) -> ~(x & y) */
(simplify
(bit_ior:c (bit_xor:s @0 @1) (bit_not:s (bit_ior:s @0 @1)))
(bit_not (bit_and @0 @1)))
/* (x | y) & ~x -> y & ~x */
/* (x & y) | ~x -> y | ~x */
(for bitop (bit_and bit_ior)
rbitop (bit_ior bit_and)
(simplify
(bitop:c (rbitop:c @0 @1) (bit_not@2 @0))
(bitop @1 @2)))
/* (x & y) ^ (x | y) -> x ^ y */
(simplify
(bit_xor:c (bit_and @0 @1) (bit_ior @0 @1))
(bit_xor @0 @1))
/* (x ^ y) ^ (x | y) -> x & y */
(simplify
(bit_xor:c (bit_xor @0 @1) (bit_ior @0 @1))
(bit_and @0 @1))
/* (x & y) + (x ^ y) -> x | y */
/* (x & y) | (x ^ y) -> x | y */
/* (x & y) ^ (x ^ y) -> x | y */
(for op (plus bit_ior bit_xor)
(simplify
(op:c (bit_and @0 @1) (bit_xor @0 @1))
(bit_ior @0 @1)))
/* (x & y) + (x | y) -> x + y */
(simplify
(plus:c (bit_and @0 @1) (bit_ior @0 @1))
(plus @0 @1))
/* (x + y) - (x | y) -> x & y */
(simplify
(minus (plus @0 @1) (bit_ior @0 @1))
(if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
&& !TYPE_SATURATING (type))
(bit_and @0 @1)))
/* (x + y) - (x & y) -> x | y */
(simplify
(minus (plus @0 @1) (bit_and @0 @1))
(if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
&& !TYPE_SATURATING (type))
(bit_ior @0 @1)))
/* (x | y) - y -> (x & ~y) */
(simplify
(minus (bit_ior:cs @0 @1) @1)
(bit_and @0 (bit_not @1)))
/* (x | y) - (x ^ y) -> x & y */
(simplify
(minus (bit_ior @0 @1) (bit_xor @0 @1))
(bit_and @0 @1))
/* (x | y) - (x & y) -> x ^ y */
(simplify
(minus (bit_ior @0 @1) (bit_and @0 @1))
(bit_xor @0 @1))
/* (x | y) & ~(x & y) -> x ^ y */
(simplify
(bit_and:c (bit_ior @0 @1) (bit_not (bit_and @0 @1)))
(bit_xor @0 @1))
/* (x | y) & (~x ^ y) -> x & y */
(simplify
(bit_and:c (bit_ior:c @0 @1) (bit_xor:c @1 (bit_not @0)))
(bit_and @0 @1))
/* (~x | y) & (x | ~y) -> ~(x ^ y) */
(simplify
(bit_and (bit_ior:cs (bit_not @0) @1) (bit_ior:cs @0 (bit_not @1)))
(bit_not (bit_xor @0 @1)))
/* (~x | y) ^ (x | ~y) -> x ^ y */
(simplify
(bit_xor (bit_ior:c (bit_not @0) @1) (bit_ior:c @0 (bit_not @1)))
(bit_xor @0 @1))
/* ((x & y) - (x | y)) - 1 -> ~(x ^ y) */
(simplify
(plus (nop_convert1? (minus@2 (nop_convert2? (bit_and:c @0 @1))
(nop_convert2? (bit_ior @0 @1))))
integer_all_onesp)
(if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
&& !TYPE_SATURATING (type) && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2))
&& !TYPE_OVERFLOW_TRAPS (TREE_TYPE (@2))
&& !TYPE_SATURATING (TREE_TYPE (@2)))
(bit_not (convert (bit_xor @0 @1)))))
(simplify
(minus (nop_convert1? (plus@2 (nop_convert2? (bit_and:c @0 @1))
integer_all_onesp))
(nop_convert3? (bit_ior @0 @1)))
(if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
&& !TYPE_SATURATING (type) && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2))
&& !TYPE_OVERFLOW_TRAPS (TREE_TYPE (@2))
&& !TYPE_SATURATING (TREE_TYPE (@2)))
(bit_not (convert (bit_xor @0 @1)))))
(simplify
(minus (nop_convert1? (bit_and @0 @1))
(nop_convert2? (plus@2 (nop_convert3? (bit_ior:c @0 @1))
integer_onep)))
(if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
&& !TYPE_SATURATING (type) && !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2))
&& !TYPE_OVERFLOW_TRAPS (TREE_TYPE (@2))
&& !TYPE_SATURATING (TREE_TYPE (@2)))
(bit_not (convert (bit_xor @0 @1)))))
/* ~x & ~y -> ~(x | y)
~x | ~y -> ~(x & y) */
(for op (bit_and bit_ior)
rop (bit_ior bit_and)
(simplify
(op (convert1? (bit_not @0)) (convert2? (bit_not @1)))
(if (element_precision (type) <= element_precision (TREE_TYPE (@0))
&& element_precision (type) <= element_precision (TREE_TYPE (@1)))
(bit_not (rop (convert @0) (convert @1))))))
/* If we are XORing or adding two BIT_AND_EXPR's, both of which are and'ing
with a constant, and the two constants have no bits in common,
we should treat this as a BIT_IOR_EXPR since this may produce more
simplifications. */
(for op (bit_xor plus)
(simplify
(op (convert1? (bit_and@4 @0 INTEGER_CST@1))
(convert2? (bit_and@5 @2 INTEGER_CST@3)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@2))
&& (wi::to_wide (@1) & wi::to_wide (@3)) == 0)
(bit_ior (convert @4) (convert @5)))))
/* (X | Y) ^ X -> Y & ~ X*/
(simplify
(bit_xor:c (convert1? (bit_ior:c @@0 @1)) (convert2? @0))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
(convert (bit_and @1 (bit_not @0)))))
/* Convert ~X ^ ~Y to X ^ Y. */
(simplify
(bit_xor (convert1? (bit_not @0)) (convert2? (bit_not @1)))
(if (element_precision (type) <= element_precision (TREE_TYPE (@0))
&& element_precision (type) <= element_precision (TREE_TYPE (@1)))
(bit_xor (convert @0) (convert @1))))
/* Convert ~X ^ C to X ^ ~C. */
(simplify
(bit_xor (convert? (bit_not @0)) INTEGER_CST@1)
(if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
(bit_xor (convert @0) (bit_not @1))))
/* Fold (X & Y) ^ Y and (X ^ Y) & Y as ~X & Y. */
(for opo (bit_and bit_xor)
opi (bit_xor bit_and)
(simplify
(opo:c (opi:cs @0 @1) @1)
(bit_and (bit_not @0) @1)))
/* Given a bit-wise operation CODE applied to ARG0 and ARG1, see if both
operands are another bit-wise operation with a common input. If so,
distribute the bit operations to save an operation and possibly two if
constants are involved. For example, convert
(A | B) & (A | C) into A | (B & C)
Further simplification will occur if B and C are constants. */
(for op (bit_and bit_ior bit_xor)
rop (bit_ior bit_and bit_and)
(simplify
(op (convert? (rop:c @@0 @1)) (convert? (rop:c @0 @2)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@1))
&& tree_nop_conversion_p (type, TREE_TYPE (@2)))
(rop (convert @0) (op (convert @1) (convert @2))))))
/* Some simple reassociation for bit operations, also handled in reassoc. */
/* (X & Y) & Y -> X & Y
(X | Y) | Y -> X | Y */
(for op (bit_and bit_ior)
(simplify
(op:c (convert1?@2 (op:c @0 @@1)) (convert2? @1))
@2))
/* (X ^ Y) ^ Y -> X */
(simplify
(bit_xor:c (convert1? (bit_xor:c @0 @@1)) (convert2? @1))
(convert @0))
/* (X & Y) & (X & Z) -> (X & Y) & Z
(X | Y) | (X | Z) -> (X | Y) | Z */
(for op (bit_and bit_ior)
(simplify
(op (convert1?@3 (op:c@4 @0 @1)) (convert2?@5 (op:c@6 @0 @2)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@1))
&& tree_nop_conversion_p (type, TREE_TYPE (@2)))
(if (single_use (@5) && single_use (@6))
(op @3 (convert @2))
(if (single_use (@3) && single_use (@4))
(op (convert @1) @5))))))
/* (X ^ Y) ^ (X ^ Z) -> Y ^ Z */
(simplify
(bit_xor (convert1? (bit_xor:c @0 @1)) (convert2? (bit_xor:c @0 @2)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@1))
&& tree_nop_conversion_p (type, TREE_TYPE (@2)))
(bit_xor (convert @1) (convert @2))))
/* Convert abs (abs (X)) into abs (X).
also absu (absu (X)) into absu (X). */
(simplify
(abs (abs@1 @0))
@1)
(simplify
(absu (convert@2 (absu@1 @0)))
(if (tree_nop_conversion_p (TREE_TYPE (@2), TREE_TYPE (@1)))
@1))
/* Convert abs[u] (-X) -> abs[u] (X). */
(simplify
(abs (negate @0))
(abs @0))
(simplify
(absu (negate @0))
(absu @0))
/* Convert abs[u] (X) where X is nonnegative -> (X). */
(simplify
(abs tree_expr_nonnegative_p@0)
@0)
(simplify
(absu tree_expr_nonnegative_p@0)
(convert @0))
/* Simplify (-(X < 0) | 1) * X into abs (X) or absu(X). */
(simplify
(mult:c (nop_convert1?
(bit_ior (nop_convert2? (negate (convert? (lt @0 integer_zerop))))
integer_onep))
(nop_convert3? @0))
(if (INTEGRAL_TYPE_P (type)
&& INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& !TYPE_UNSIGNED (TREE_TYPE (@0)))
(if (TYPE_UNSIGNED (type))
(absu @0)
(abs @0)
)
)
)
/* A few cases of fold-const.cc negate_expr_p predicate. */
(match negate_expr_p
INTEGER_CST
(if ((INTEGRAL_TYPE_P (type)
&& TYPE_UNSIGNED (type))
|| (!TYPE_OVERFLOW_SANITIZED (type)
&& may_negate_without_overflow_p (t)))))
(match negate_expr_p
FIXED_CST)
(match negate_expr_p
(negate @0)
(if (!TYPE_OVERFLOW_SANITIZED (type))))
(match negate_expr_p
REAL_CST
(if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (t)))))
/* VECTOR_CST handling of non-wrapping types would recurse in unsupported
ways. */
(match negate_expr_p
VECTOR_CST
(if (FLOAT_TYPE_P (TREE_TYPE (type)) || TYPE_OVERFLOW_WRAPS (type))))
(match negate_expr_p
(minus @0 @1)
(if ((ANY_INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_WRAPS (type))
|| (FLOAT_TYPE_P (type)
&& !HONOR_SIGN_DEPENDENT_ROUNDING (type)
&& !HONOR_SIGNED_ZEROS (type)))))
/* (-A) * (-B) -> A * B */
(simplify
(mult:c (convert1? (negate @0)) (convert2? negate_expr_p@1))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@1)))
(mult (convert @0) (convert (negate @1)))))
/* -(A + B) -> (-B) - A. */
(simplify
(negate (plus:c @0 negate_expr_p@1))
(if (!HONOR_SIGN_DEPENDENT_ROUNDING (type)
&& !HONOR_SIGNED_ZEROS (type))
(minus (negate @1) @0)))
/* -(A - B) -> B - A. */
(simplify
(negate (minus @0 @1))
(if ((ANY_INTEGRAL_TYPE_P (type) && !TYPE_OVERFLOW_SANITIZED (type))
|| (FLOAT_TYPE_P (type)
&& !HONOR_SIGN_DEPENDENT_ROUNDING (type)
&& !HONOR_SIGNED_ZEROS (type)))
(minus @1 @0)))
(simplify
(negate (pointer_diff @0 @1))
(if (TYPE_OVERFLOW_UNDEFINED (type))
(pointer_diff @1 @0)))
/* A - B -> A + (-B) if B is easily negatable. */
(simplify
(minus @0 negate_expr_p@1)
(if (!FIXED_POINT_TYPE_P (type))
(plus @0 (negate @1))))
/* Other simplifications of negation (c.f. fold_negate_expr_1). */
(simplify
(negate (mult:c@0 @1 negate_expr_p@2))
(if (! TYPE_UNSIGNED (type)
&& ! HONOR_SIGN_DEPENDENT_ROUNDING (type)
&& single_use (@0))
(mult @1 (negate @2))))
(simplify
(negate (rdiv@0 @1 negate_expr_p@2))
(if (! HONOR_SIGN_DEPENDENT_ROUNDING (type)
&& single_use (@0))
(rdiv @1 (negate @2))))
(simplify
(negate (rdiv@0 negate_expr_p@1 @2))
(if (! HONOR_SIGN_DEPENDENT_ROUNDING (type)
&& single_use (@0))
(rdiv (negate @1) @2)))
/* Fold -((int)x >> (prec - 1)) into (unsigned)x >> (prec - 1). */
(simplify
(negate (convert? (rshift @0 INTEGER_CST@1)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0))
&& wi::to_wide (@1) == element_precision (type) - 1)
(with { tree stype = TREE_TYPE (@0);
tree ntype = TYPE_UNSIGNED (stype) ? signed_type_for (stype)
: unsigned_type_for (stype); }
(if (VECTOR_TYPE_P (type))
(view_convert (rshift (view_convert:ntype @0) @1))
(convert (rshift (convert:ntype @0) @1))))))
/* Try to fold (type) X op CST -> (type) (X op ((type-x) CST))
when profitable.
For bitwise binary operations apply operand conversions to the
binary operation result instead of to the operands. This allows
to combine successive conversions and bitwise binary operations.
We combine the above two cases by using a conditional convert. */
(for bitop (bit_and bit_ior bit_xor)
(simplify
(bitop (convert@2 @0) (convert?@3 @1))
(if (((TREE_CODE (@1) == INTEGER_CST
&& INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& (int_fits_type_p (@1, TREE_TYPE (@0))
|| tree_nop_conversion_p (TREE_TYPE (@0), type)))
|| types_match (@0, @1))
/* ??? This transform conflicts with fold-const.cc doing
Convert (T)(x & c) into (T)x & (T)c, if c is an integer
constants (if x has signed type, the sign bit cannot be set
in c). This folds extension into the BIT_AND_EXPR.
Restrict it to GIMPLE to avoid endless recursions. */
&& (bitop != BIT_AND_EXPR || GIMPLE)
&& (/* That's a good idea if the conversion widens the operand, thus
after hoisting the conversion the operation will be narrower.
It is also a good if the conversion is a nop as moves the
conversion to one side; allowing for combining of the conversions. */
TYPE_PRECISION (TREE_TYPE (@0)) < TYPE_PRECISION (type)
/* The conversion check for being a nop can only be done at the gimple
level as fold_binary has some re-association code which can conflict
with this if there is a "constant" which is not a full INTEGER_CST. */
|| (GIMPLE && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (type))
/* It's also a good idea if the conversion is to a non-integer
mode. */
|| GET_MODE_CLASS (TYPE_MODE (type)) != MODE_INT
/* Or if the precision of TO is not the same as the precision
of its mode. */
|| !type_has_mode_precision_p (type)
/* In GIMPLE, getting rid of 2 conversions for one new results
in smaller IL. */
|| (GIMPLE
&& TREE_CODE (@1) != INTEGER_CST
&& tree_nop_conversion_p (type, TREE_TYPE (@0))
&& single_use (@2)
&& single_use (@3))))
(convert (bitop @0 (convert @1)))))
/* In GIMPLE, getting rid of 2 conversions for one new results
in smaller IL. */
(simplify
(convert (bitop:cs@2 (nop_convert:s @0) @1))
(if (GIMPLE
&& TREE_CODE (@1) != INTEGER_CST
&& tree_nop_conversion_p (type, TREE_TYPE (@2))
&& types_match (type, @0))
(bitop @0 (convert @1)))))
(for bitop (bit_and bit_ior)
rbitop (bit_ior bit_and)
/* (x | y) & x -> x */
/* (x & y) | x -> x */
(simplify
(bitop:c (rbitop:c @0 @1) @0)
@0)
/* (~x | y) & x -> x & y */
/* (~x & y) | x -> x | y */
(simplify
(bitop:c (rbitop:c (bit_not @0) @1) @0)
(bitop @0 @1)))
/* ((x | y) & z) | x -> (z & y) | x */
(simplify
(bit_ior:c (bit_and:cs (bit_ior:cs @0 @1) @2) @0)
(bit_ior (bit_and @2 @1) @0))
/* (x | CST1) & CST2 -> (x & CST2) | (CST1 & CST2) */
(simplify
(bit_and (bit_ior @0 CONSTANT_CLASS_P@1) CONSTANT_CLASS_P@2)
(bit_ior (bit_and @0 @2) (bit_and @1 @2)))
/* Combine successive equal operations with constants. */
(for bitop (bit_and bit_ior bit_xor)
(simplify
(bitop (bitop @0 CONSTANT_CLASS_P@1) CONSTANT_CLASS_P@2)
(if (!CONSTANT_CLASS_P (@0))
/* This is the canonical form regardless of whether (bitop @1 @2) can be
folded to a constant. */
(bitop @0 (bitop @1 @2))
/* In this case we have three constants and (bitop @0 @1) doesn't fold
to a constant. This can happen if @0 or @1 is a POLY_INT_CST and if
the values involved are such that the operation can't be decided at
compile time. Try folding one of @0 or @1 with @2 to see whether
that combination can be decided at compile time.
Keep the existing form if both folds fail, to avoid endless
oscillation. */
(with { tree cst1 = const_binop (bitop, type, @0, @2); }
(if (cst1)
(bitop @1 { cst1; })
(with { tree cst2 = const_binop (bitop, type, @1, @2); }
(if (cst2)
(bitop @0 { cst2; }))))))))
/* Try simple folding for X op !X, and X op X with the help
of the truth_valued_p and logical_inverted_value predicates. */
(match truth_valued_p
@0
(if (INTEGRAL_TYPE_P (type) && TYPE_PRECISION (type) == 1)))
(for op (tcc_comparison truth_and truth_andif truth_or truth_orif truth_xor)
(match truth_valued_p
(op @0 @1)))
(match truth_valued_p
(truth_not @0))
(match (logical_inverted_value @0)
(truth_not @0))
(match (logical_inverted_value @0)
(bit_not truth_valued_p@0))
(match (logical_inverted_value @0)
(eq @0 integer_zerop))
(match (logical_inverted_value @0)
(ne truth_valued_p@0 integer_truep))
(match (logical_inverted_value @0)
(bit_xor truth_valued_p@0 integer_truep))
/* X & !X -> 0. */
(simplify
(bit_and:c @0 (logical_inverted_value @0))
{ build_zero_cst (type); })
/* X | !X and X ^ !X -> 1, , if X is truth-valued. */
(for op (bit_ior bit_xor)
(simplify
(op:c truth_valued_p@0 (logical_inverted_value @0))
{ constant_boolean_node (true, type); }))
/* X ==/!= !X is false/true. */
(for op (eq ne)
(simplify
(op:c truth_valued_p@0 (logical_inverted_value @0))
{ constant_boolean_node (op == NE_EXPR ? true : false, type); }))
/* ~~x -> x */
(simplify
(bit_not (bit_not @0))
@0)
/* Convert ~ (-A) to A - 1. */
(simplify
(bit_not (convert? (negate @0)))
(if (element_precision (type) <= element_precision (TREE_TYPE (@0))
|| !TYPE_UNSIGNED (TREE_TYPE (@0)))
(convert (minus @0 { build_each_one_cst (TREE_TYPE (@0)); }))))
/* Convert - (~A) to A + 1. */
(simplify
(negate (nop_convert? (bit_not @0)))
(plus (view_convert @0) { build_each_one_cst (type); }))
/* (a & b) ^ (a == b) -> !(a | b) */
/* (a & b) == (a ^ b) -> !(a | b) */
(for first_op (bit_xor eq)
second_op (eq bit_xor)
(simplify
(first_op:c (bit_and:c truth_valued_p@0 truth_valued_p@1) (second_op:c @0 @1))
(bit_not (bit_ior @0 @1))))
/* Convert ~ (A - 1) or ~ (A + -1) to -A. */
(simplify
(bit_not (convert? (minus @0 integer_each_onep)))
(if (element_precision (type) <= element_precision (TREE_TYPE (@0))
|| !TYPE_UNSIGNED (TREE_TYPE (@0)))
(convert (negate @0))))
(simplify
(bit_not (convert? (plus @0 integer_all_onesp)))
(if (element_precision (type) <= element_precision (TREE_TYPE (@0))
|| !TYPE_UNSIGNED (TREE_TYPE (@0)))
(convert (negate @0))))
/* Part of convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */
(simplify
(bit_not (convert? (bit_xor @0 INTEGER_CST@1)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
(convert (bit_xor @0 (bit_not @1)))))
(simplify
(bit_not (convert? (bit_xor:c (bit_not @0) @1)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
(convert (bit_xor @0 @1))))
/* Otherwise prefer ~(X ^ Y) to ~X ^ Y as more canonical. */
(simplify
(bit_xor:c (nop_convert?:s (bit_not:s @0)) @1)
(if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
(bit_not (bit_xor (view_convert @0) @1))))
/* (x & ~m) | (y & m) -> ((x ^ y) & m) ^ x */
(simplify
(bit_ior:c (bit_and:cs @0 (bit_not @2)) (bit_and:cs @1 @2))
(bit_xor (bit_and (bit_xor @0 @1) @2) @0))
/* Fold A - (A & B) into ~B & A. */
(simplify
(minus (convert1? @0) (convert2?:s (bit_and:cs @@0 @1)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@1)))
(convert (bit_and (bit_not @1) @0))))
/* (m1 CMP m2) * d -> (m1 CMP m2) ? d : 0 */
(if (!canonicalize_math_p ())
(for cmp (gt lt ge le)
(simplify
(mult (convert (cmp @0 @1)) @2)
(cond (cmp @0 @1) @2 { build_zero_cst (type); }))))
/* For integral types with undefined overflow and C != 0 fold
x * C EQ/NE y * C into x EQ/NE y. */
(for cmp (eq ne)
(simplify
(cmp (mult:c @0 @1) (mult:c @2 @1))
(if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
&& tree_expr_nonzero_p (@1))
(cmp @0 @2))))
/* For integral types with wrapping overflow and C odd fold
x * C EQ/NE y * C into x EQ/NE y. */
(for cmp (eq ne)
(simplify
(cmp (mult @0 INTEGER_CST@1) (mult @2 @1))
(if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
&& TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))
&& (TREE_INT_CST_LOW (@1) & 1) != 0)
(cmp @0 @2))))
/* For integral types with undefined overflow and C != 0 fold
x * C RELOP y * C into:
x RELOP y for nonnegative C
y RELOP x for negative C */
(for cmp (lt gt le ge)
(simplify
(cmp (mult:c @0 @1) (mult:c @2 @1))
(if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
(if (tree_expr_nonnegative_p (@1) && tree_expr_nonzero_p (@1))
(cmp @0 @2)
(if (TREE_CODE (@1) == INTEGER_CST
&& wi::neg_p (wi::to_wide (@1), TYPE_SIGN (TREE_TYPE (@1))))
(cmp @2 @0))))))
/* (X - 1U) <= INT_MAX-1U into (int) X > 0. */
(for cmp (le gt)
icmp (gt le)
(simplify
(cmp (plus @0 integer_minus_onep@1) INTEGER_CST@2)
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& TYPE_UNSIGNED (TREE_TYPE (@0))
&& TYPE_PRECISION (TREE_TYPE (@0)) > 1
&& (wi::to_wide (@2)
== wi::max_value (TYPE_PRECISION (TREE_TYPE (@0)), SIGNED) - 1))
(with { tree stype = signed_type_for (TREE_TYPE (@0)); }
(icmp (convert:stype @0) { build_int_cst (stype, 0); })))))
/* X / 4 < Y / 4 iff X < Y when the division is known to be exact. */
(for cmp (simple_comparison)
(simplify
(cmp (convert?@3 (exact_div @0 INTEGER_CST@2)) (convert? (exact_div @1 @2)))
(if (element_precision (@3) >= element_precision (@0)
&& types_match (@0, @1))
(if (wi::lt_p (wi::to_wide (@2), 0, TYPE_SIGN (TREE_TYPE (@2))))
(if (!TYPE_UNSIGNED (TREE_TYPE (@3)))
(cmp @1 @0)
(if (tree_expr_nonzero_p (@0) && tree_expr_nonzero_p (@1))
(with
{
tree utype = unsigned_type_for (TREE_TYPE (@0));
}
(cmp (convert:utype @1) (convert:utype @0)))))
(if (wi::gt_p (wi::to_wide (@2), 1, TYPE_SIGN (TREE_TYPE (@2))))
(if (TYPE_UNSIGNED (TREE_TYPE (@0)) || !TYPE_UNSIGNED (TREE_TYPE (@3)))
(cmp @0 @1)
(with
{
tree utype = unsigned_type_for (TREE_TYPE (@0));
}
(cmp (convert:utype @0) (convert:utype @1)))))))))
/* X / C1 op C2 into a simple range test. */
(for cmp (simple_comparison)
(simplify
(cmp (trunc_div:s @0 INTEGER_CST@1) INTEGER_CST@2)
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& integer_nonzerop (@1)
&& !TREE_OVERFLOW (@1)
&& !TREE_OVERFLOW (@2))
(with { tree lo, hi; bool neg_overflow;
enum tree_code code = fold_div_compare (cmp, @1, @2, &lo, &hi,
&neg_overflow); }
(switch
(if (code == LT_EXPR || code == GE_EXPR)
(if (TREE_OVERFLOW (lo))
{ build_int_cst (type, (code == LT_EXPR) ^ neg_overflow); }
(if (code == LT_EXPR)
(lt @0 { lo; })
(ge @0 { lo; }))))
(if (code == LE_EXPR || code == GT_EXPR)
(if (TREE_OVERFLOW (hi))
{ build_int_cst (type, (code == LE_EXPR) ^ neg_overflow); }
(if (code == LE_EXPR)
(le @0 { hi; })
(gt @0 { hi; }))))
(if (!lo && !hi)
{ build_int_cst (type, code == NE_EXPR); })
(if (code == EQ_EXPR && !hi)
(ge @0 { lo; }))
(if (code == EQ_EXPR && !lo)
(le @0 { hi; }))
(if (code == NE_EXPR && !hi)
(lt @0 { lo; }))
(if (code == NE_EXPR && !lo)
(gt @0 { hi; }))
(if (GENERIC)
{ build_range_check (UNKNOWN_LOCATION, type, @0, code == EQ_EXPR,
lo, hi); })
(with
{
tree etype = range_check_type (TREE_TYPE (@0));
if (etype)
{
hi = fold_convert (etype, hi);
lo = fold_convert (etype, lo);
hi = const_binop (MINUS_EXPR, etype, hi, lo);
}
}
(if (etype && hi && !TREE_OVERFLOW (hi))
(if (code == EQ_EXPR)
(le (minus (convert:etype @0) { lo; }) { hi; })
(gt (minus (convert:etype @0) { lo; }) { hi; })))))))))
/* X + Z < Y + Z is the same as X < Y when there is no overflow. */
(for op (lt le ge gt)
(simplify
(op (plus:c @0 @2) (plus:c @1 @2))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
(op @0 @1))))
/* For equality and subtraction, this is also true with wrapping overflow. */
(for op (eq ne minus)
(simplify
(op (plus:c @0 @2) (plus:c @1 @2))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
|| TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))))
(op @0 @1))))
/* X - Z < Y - Z is the same as X < Y when there is no overflow. */
(for op (lt le ge gt)
(simplify
(op (minus @0 @2) (minus @1 @2))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
(op @0 @1))))
/* For equality and subtraction, this is also true with wrapping overflow. */
(for op (eq ne minus)
(simplify
(op (minus @0 @2) (minus @1 @2))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
|| TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))))
(op @0 @1))))
/* And for pointers... */
(for op (simple_comparison)
(simplify
(op (pointer_diff@3 @0 @2) (pointer_diff @1 @2))
(if (!TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2)))
(op @0 @1))))
(simplify
(minus (pointer_diff@3 @0 @2) (pointer_diff @1 @2))
(if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@3))
&& !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2)))
(pointer_diff @0 @1)))
/* Z - X < Z - Y is the same as Y < X when there is no overflow. */
(for op (lt le ge gt)
(simplify
(op (minus @2 @0) (minus @2 @1))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
(op @1 @0))))
/* For equality and subtraction, this is also true with wrapping overflow. */
(for op (eq ne minus)
(simplify
(op (minus @2 @0) (minus @2 @1))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
|| TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))))
(op @1 @0))))
/* And for pointers... */
(for op (simple_comparison)
(simplify
(op (pointer_diff@3 @2 @0) (pointer_diff @2 @1))
(if (!TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2)))
(op @1 @0))))
(simplify
(minus (pointer_diff@3 @2 @0) (pointer_diff @2 @1))
(if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@3))
&& !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@2)))
(pointer_diff @1 @0)))
/* X + Y < Y is the same as X < 0 when there is no overflow. */
(for op (lt le gt ge)
(simplify
(op:c (plus:c@2 @0 @1) @1)
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
&& !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@0))
&& (CONSTANT_CLASS_P (@0) || single_use (@2)))
(op @0 { build_zero_cst (TREE_TYPE (@0)); }))))
/* For equality, this is also true with wrapping overflow. */
(for op (eq ne)
(simplify
(op:c (nop_convert?@3 (plus:c@2 @0 (convert1? @1))) (convert2? @1))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
|| TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
&& (CONSTANT_CLASS_P (@0) || (single_use (@2) && single_use (@3)))
&& tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@2))
&& tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@1)))
(op @0 { build_zero_cst (TREE_TYPE (@0)); })))
(simplify
(op:c (nop_convert?@3 (pointer_plus@2 (convert1? @0) @1)) (convert2? @0))
(if (tree_nop_conversion_p (TREE_TYPE (@2), TREE_TYPE (@0))
&& tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@0))
&& (CONSTANT_CLASS_P (@1) || (single_use (@2) && single_use (@3))))
(op @1 { build_zero_cst (TREE_TYPE (@1)); }))))
/* X - Y < X is the same as Y > 0 when there is no overflow.
For equality, this is also true with wrapping overflow. */
(for op (simple_comparison)
(simplify
(op:c @0 (minus@2 @0 @1))
(if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
|| ((op == EQ_EXPR || op == NE_EXPR)
&& TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))))
&& (CONSTANT_CLASS_P (@1) || single_use (@2)))
(op @1 { build_zero_cst (TREE_TYPE (@1)); }))))
/* Transform:
(X / Y) == 0 -> X < Y if X, Y are unsigned.
(X / Y) != 0 -> X >= Y, if X, Y are unsigned. */
(for cmp (eq ne)
ocmp (lt ge)
(simplify
(cmp (trunc_div @0 @1) integer_zerop)
(if (TYPE_UNSIGNED (TREE_TYPE (@0))
/* Complex ==/!= is allowed, but not </>=. */
&& TREE_CODE (TREE_TYPE (@0)) != COMPLEX_TYPE
&& (VECTOR_TYPE_P (type) || !VECTOR_TYPE_P (TREE_TYPE (@0))))
(ocmp @0 @1))))
/* X == C - X can never be true if C is odd. */
(for cmp (eq ne)
(simplify
(cmp:c (convert? @0) (convert1? (minus INTEGER_CST@1 (convert2? @0))))
(if (TREE_INT_CST_LOW (@1) & 1)
{ constant_boolean_node (cmp == NE_EXPR, type); })))
/* Arguments on which one can call get_nonzero_bits to get the bits
possibly set. */
(match with_possible_nonzero_bits
INTEGER_CST@0)
(match with_possible_nonzero_bits
SSA_NAME@0
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))))
/* Slightly extended version, do not make it recursive to keep it cheap. */
(match (with_possible_nonzero_bits2 @0)
with_possible_nonzero_bits@0)
(match (with_possible_nonzero_bits2 @0)
(bit_and:c with_possible_nonzero_bits@0 @2))
/* Same for bits that are known to be set, but we do not have
an equivalent to get_nonzero_bits yet. */
(match (with_certain_nonzero_bits2 @0)
INTEGER_CST@0)
(match (with_certain_nonzero_bits2 @0)
(bit_ior @1 INTEGER_CST@0))
/* X == C (or X & Z == Y | C) is impossible if ~nonzero(X) & C != 0. */
(for cmp (eq ne)
(simplify
(cmp:c (with_possible_nonzero_bits2 @0) (with_certain_nonzero_bits2 @1))
(if (wi::bit_and_not (wi::to_wide (@1), get_nonzero_bits (@0)) != 0)
{ constant_boolean_node (cmp == NE_EXPR, type); })))
/* ((X inner_op C0) outer_op C1)
With X being a tree where value_range has reasoned certain bits to always be
zero throughout its computed value range,
inner_op = {|,^}, outer_op = {|,^} and inner_op != outer_op
where zero_mask has 1's for all bits that are sure to be 0 in
and 0's otherwise.
if (inner_op == '^') C0 &= ~C1;
if ((C0 & ~zero_mask) == 0) then emit (X outer_op (C0 outer_op C1)
if ((C1 & ~zero_mask) == 0) then emit (X inner_op (C0 outer_op C1)
*/
(for inner_op (bit_ior bit_xor)
outer_op (bit_xor bit_ior)
(simplify
(outer_op
(inner_op:s @2 INTEGER_CST@0) INTEGER_CST@1)
(with
{
bool fail = false;
wide_int zero_mask_not;
wide_int C0;
wide_int cst_emit;
if (TREE_CODE (@2) == SSA_NAME)
zero_mask_not = get_nonzero_bits (@2);
else
fail = true;
if (inner_op == BIT_XOR_EXPR)
{
C0 = wi::bit_and_not (wi::to_wide (@0), wi::to_wide (@1));
cst_emit = C0 | wi::to_wide (@1);
}
else
{
C0 = wi::to_wide (@0);
cst_emit = C0 ^ wi::to_wide (@1);
}
}
(if (!fail && (C0 & zero_mask_not) == 0)
(outer_op @2 { wide_int_to_tree (type, cst_emit); })
(if (!fail && (wi::to_wide (@1) & zero_mask_not) == 0)
(inner_op @2 { wide_int_to_tree (type, cst_emit); }))))))
/* Associate (p +p off1) +p off2 as (p +p (off1 + off2)). */
(simplify
(pointer_plus (pointer_plus:s @0 @1) @3)
(pointer_plus @0 (plus @1 @3)))
#if GENERIC
(simplify
(pointer_plus (convert:s (pointer_plus:s @0 @1)) @3)
(convert:type (pointer_plus @0 (plus @1 @3))))
#endif
/* Pattern match
tem1 = (long) ptr1;
tem2 = (long) ptr2;
tem3 = tem2 - tem1;
tem4 = (unsigned long) tem3;
tem5 = ptr1 + tem4;
and produce
tem5 = ptr2; */
(simplify
(pointer_plus @0 (convert?@2 (minus@3 (convert @1) (convert @0))))
/* Conditionally look through a sign-changing conversion. */
(if (TYPE_PRECISION (TREE_TYPE (@2)) == TYPE_PRECISION (TREE_TYPE (@3))
&& ((GIMPLE && useless_type_conversion_p (type, TREE_TYPE (@1)))
|| (GENERIC && type == TREE_TYPE (@1))))
@1))
(simplify
(pointer_plus @0 (convert?@2 (pointer_diff@3 @1 @@0)))
(if (TYPE_PRECISION (TREE_TYPE (@2)) >= TYPE_PRECISION (TREE_TYPE (@3)))
(convert @1)))
/* Pattern match
tem = (sizetype) ptr;
tem = tem & algn;
tem = -tem;
... = ptr p+ tem;
and produce the simpler and easier to analyze with respect to alignment
... = ptr & ~algn; */
(simplify
(pointer_plus @0 (negate (bit_and (convert @0) INTEGER_CST@1)))
(with { tree algn = wide_int_to_tree (TREE_TYPE (@0), ~wi::to_wide (@1)); }
(bit_and @0 { algn; })))
/* Try folding difference of addresses. */
(simplify
(minus (convert ADDR_EXPR@0) (convert @1))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
(with { poly_int64 diff; }
(if (ptr_difference_const (@0, @1, &diff))
{ build_int_cst_type (type, diff); }))))
(simplify
(minus (convert @0) (convert ADDR_EXPR@1))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
(with { poly_int64 diff; }
(if (ptr_difference_const (@0, @1, &diff))
{ build_int_cst_type (type, diff); }))))
(simplify
(pointer_diff (convert?@2 ADDR_EXPR@0) (convert1?@3 @1))
(if (tree_nop_conversion_p (TREE_TYPE(@2), TREE_TYPE (@0))
&& tree_nop_conversion_p (TREE_TYPE(@3), TREE_TYPE (@1)))
(with { poly_int64 diff; }
(if (ptr_difference_const (@0, @1, &diff))
{ build_int_cst_type (type, diff); }))))
(simplify
(pointer_diff (convert?@2 @0) (convert1?@3 ADDR_EXPR@1))
(if (tree_nop_conversion_p (TREE_TYPE(@2), TREE_TYPE (@0))
&& tree_nop_conversion_p (TREE_TYPE(@3), TREE_TYPE (@1)))
(with { poly_int64 diff; }
(if (ptr_difference_const (@0, @1, &diff))
{ build_int_cst_type (type, diff); }))))
/* (&a+b) - (&a[1] + c) -> sizeof(a[0]) + (b - c) */
(simplify
(pointer_diff (pointer_plus ADDR_EXPR@0 @1) (pointer_plus ADDR_EXPR@2 @3))
(with { poly_int64 diff; }
(if (ptr_difference_const (@0, @2, &diff))
(plus { build_int_cst_type (type, diff); } (convert (minus @1 @3))))))
/* (&a+b) !=/== (&a[1] + c) -> sizeof(a[0]) + b !=/== c */
(for neeq (ne eq)
(simplify
(neeq (pointer_plus ADDR_EXPR@0 @1) (pointer_plus ADDR_EXPR@2 @3))
(with { poly_int64 diff; tree inner_type = TREE_TYPE (@1);}
(if (ptr_difference_const (@0, @2, &diff))
(neeq (plus { build_int_cst_type (inner_type, diff); } @1) @3)))))
/* Canonicalize (T *)(ptr - ptr-cst) to &MEM[ptr + -ptr-cst]. */
(simplify
(convert (pointer_diff @0 INTEGER_CST@1))
(if (POINTER_TYPE_P (type))
{ build_fold_addr_expr_with_type
(build2 (MEM_REF, char_type_node, @0,
wide_int_to_tree (ptr_type_node, wi::neg (wi::to_wide (@1)))),
type); }))
/* If arg0 is derived from the address of an object or function, we may
be able to fold this expression using the object or function's
alignment. */
(simplify
(bit_and (convert? @0) INTEGER_CST@1)
(if (POINTER_TYPE_P (TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@0)))
(with
{
unsigned int align;
unsigned HOST_WIDE_INT bitpos;
get_pointer_alignment_1 (@0, &align, &bitpos);
}
(if (wi::ltu_p (wi::to_wide (@1), align / BITS_PER_UNIT))
{ wide_int_to_tree (type, (wi::to_wide (@1)
& (bitpos / BITS_PER_UNIT))); }))))
(match min_value
INTEGER_CST
(if (INTEGRAL_TYPE_P (type)
&& wi::eq_p (wi::to_wide (t), wi::min_value (type)))))
(match max_value
INTEGER_CST
(if (INTEGRAL_TYPE_P (type)
&& wi::eq_p (wi::to_wide (t), wi::max_value (type)))))
/* x > y && x != XXX_MIN --> x > y
x > y && x == XXX_MIN --> false . */
(for eqne (eq ne)
(simplify
(bit_and:c (gt:c@2 @0 @1) (eqne @0 min_value))
(switch
(if (eqne == EQ_EXPR)
{ constant_boolean_node (false, type); })
(if (eqne == NE_EXPR)
@2)
)))
/* x < y && x != XXX_MAX --> x < y
x < y && x == XXX_MAX --> false. */
(for eqne (eq ne)
(simplify
(bit_and:c (lt:c@2 @0 @1) (eqne @0 max_value))
(switch
(if (eqne == EQ_EXPR)
{ constant_boolean_node (false, type); })
(if (eqne == NE_EXPR)
@2)
)))
/* x <= y && x == XXX_MIN --> x == XXX_MIN. */
(simplify
(bit_and:c (le:c @0 @1) (eq@2 @0 min_value))
@2)
/* x >= y && x == XXX_MAX --> x == XXX_MAX. */
(simplify
(bit_and:c (ge:c @0 @1) (eq@2 @0 max_value))
@2)
/* x > y || x != XXX_MIN --> x != XXX_MIN. */
(simplify
(bit_ior:c (gt:c @0 @1) (ne@2 @0 min_value))
@2)
/* x <= y || x != XXX_MIN --> true. */
(simplify
(bit_ior:c (le:c @0 @1) (ne @0 min_value))
{ constant_boolean_node (true, type); })
/* x <= y || x == XXX_MIN --> x <= y. */
(simplify
(bit_ior:c (le:c@2 @0 @1) (eq @0 min_value))
@2)
/* x < y || x != XXX_MAX --> x != XXX_MAX. */
(simplify
(bit_ior:c (lt:c @0 @1) (ne@2 @0 max_value))
@2)
/* x >= y || x != XXX_MAX --> true
x >= y || x == XXX_MAX --> x >= y. */
(for eqne (eq ne)
(simplify
(bit_ior:c (ge:c@2 @0 @1) (eqne @0 max_value))
(switch
(if (eqne == EQ_EXPR)
@2)
(if (eqne == NE_EXPR)
{ constant_boolean_node (true, type); }))))
/* y == XXX_MIN || x < y --> x <= y - 1 */
(simplify
(bit_ior:c (eq:s @1 min_value) (lt:s @0 @1))
(if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
&& TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
(le @0 (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))
/* y != XXX_MIN && x >= y --> x > y - 1 */
(simplify
(bit_and:c (ne:s @1 min_value) (ge:s @0 @1))
(if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
&& TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
(gt @0 (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))
/* Convert (X == CST1) && (X OP2 CST2) to a known value
based on CST1 OP2 CST2. Similarly for (X != CST1). */
(for code1 (eq ne)
(for code2 (eq ne lt gt le ge)
(simplify
(bit_and:c (code1@3 @0 INTEGER_CST@1) (code2@4 @0 INTEGER_CST@2))
(with
{
int cmp = tree_int_cst_compare (@1, @2);
bool val;
switch (code2)
{
case EQ_EXPR: val = (cmp == 0); break;
case NE_EXPR: val = (cmp != 0); break;
case LT_EXPR: val = (cmp < 0); break;
case GT_EXPR: val = (cmp > 0); break;
case LE_EXPR: val = (cmp <= 0); break;
case GE_EXPR: val = (cmp >= 0); break;
default: gcc_unreachable ();
}
}
(switch
(if (code1 == EQ_EXPR && val) @3)
(if (code1 == EQ_EXPR && !val) { constant_boolean_node (false, type); })
(if (code1 == NE_EXPR && !val) @4))))))
/* Convert (X OP1 CST1) && (X OP2 CST2). */
(for code1 (lt le gt ge)
(for code2 (lt le gt ge)
(simplify
(bit_and (code1:c@3 @0 INTEGER_CST@1) (code2:c@4 @0 INTEGER_CST@2))
(with
{
int cmp = tree_int_cst_compare (@1, @2);
}
(switch
/* Choose the more restrictive of two < or <= comparisons. */
(if ((code1 == LT_EXPR || code1 == LE_EXPR)
&& (code2 == LT_EXPR || code2 == LE_EXPR))
(if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR))
@3
@4))
/* Likewise chose the more restrictive of two > or >= comparisons. */
(if ((code1 == GT_EXPR || code1 == GE_EXPR)
&& (code2 == GT_EXPR || code2 == GE_EXPR))
(if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR))
@3
@4))
/* Check for singleton ranges. */
(if (cmp == 0
&& ((code1 == LE_EXPR && code2 == GE_EXPR)
|| (code1 == GE_EXPR && code2 == LE_EXPR)))
(eq @0 @1))
/* Check for disjoint ranges. */
(if (cmp <= 0
&& (code1 == LT_EXPR || code1 == LE_EXPR)
&& (code2 == GT_EXPR || code2 == GE_EXPR))
{ constant_boolean_node (false, type); })
(if (cmp >= 0
&& (code1 == GT_EXPR || code1 == GE_EXPR)
&& (code2 == LT_EXPR || code2 == LE_EXPR))
{ constant_boolean_node (false, type); })
)))))
/* Convert (X == CST1) || (X OP2 CST2) to a known value
based on CST1 OP2 CST2. Similarly for (X != CST1). */
(for code1 (eq ne)
(for code2 (eq ne lt gt le ge)
(simplify
(bit_ior:c (code1@3 @0 INTEGER_CST@1) (code2@4 @0 INTEGER_CST@2))
(with
{
int cmp = tree_int_cst_compare (@1, @2);
bool val;
switch (code2)
{
case EQ_EXPR: val = (cmp == 0); break;
case NE_EXPR: val = (cmp != 0); break;
case LT_EXPR: val = (cmp < 0); break;
case GT_EXPR: val = (cmp > 0); break;
case LE_EXPR: val = (cmp <= 0); break;
case GE_EXPR: val = (cmp >= 0); break;
default: gcc_unreachable ();
}
}
(switch
(if (code1 == EQ_EXPR && val) @4)
(if (code1 == NE_EXPR && val) { constant_boolean_node (true, type); })
(if (code1 == NE_EXPR && !val) @3))))))
/* Convert (X OP1 CST1) || (X OP2 CST2). */
(for code1 (lt le gt ge)
(for code2 (lt le gt ge)
(simplify
(bit_ior (code1@3 @0 INTEGER_CST@1) (code2@4 @0 INTEGER_CST@2))
(with
{
int cmp = tree_int_cst_compare (@1, @2);
}
(switch
/* Choose the more restrictive of two < or <= comparisons. */
(if ((code1 == LT_EXPR || code1 == LE_EXPR)
&& (code2 == LT_EXPR || code2 == LE_EXPR))
(if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR))
@4
@3))
/* Likewise chose the more restrictive of two > or >= comparisons. */
(if ((code1 == GT_EXPR || code1 == GE_EXPR)
&& (code2 == GT_EXPR || code2 == GE_EXPR))
(if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR))
@4
@3))
/* Check for singleton ranges. */
(if (cmp == 0
&& ((code1 == LT_EXPR && code2 == GT_EXPR)
|| (code1 == GT_EXPR && code2 == LT_EXPR)))
(ne @0 @2))
/* Check for disjoint ranges. */
(if (cmp >= 0
&& (code1 == LT_EXPR || code1 == LE_EXPR)
&& (code2 == GT_EXPR || code2 == GE_EXPR))
{ constant_boolean_node (true, type); })
(if (cmp <= 0
&& (code1 == GT_EXPR || code1 == GE_EXPR)
&& (code2 == LT_EXPR || code2 == LE_EXPR))
{ constant_boolean_node (true, type); })
)))))
/* We can't reassociate at all for saturating types. */
(if (!TYPE_SATURATING (type))
/* Contract negates. */
/* A + (-B) -> A - B */
(simplify
(plus:c @0 (convert? (negate @1)))
/* Apply STRIP_NOPS on the negate. */
(if (tree_nop_conversion_p (type, TREE_TYPE (@1))
&& !TYPE_OVERFLOW_SANITIZED (type))
(with
{
tree t1 = type;
if (INTEGRAL_TYPE_P (type)
&& TYPE_OVERFLOW_WRAPS (type) != TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
t1 = TYPE_OVERFLOW_WRAPS (type) ? type : TREE_TYPE (@1);
}
(convert (minus (convert:t1 @0) (convert:t1 @1))))))
/* A - (-B) -> A + B */
(simplify
(minus @0 (convert? (negate @1)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@1))
&& !TYPE_OVERFLOW_SANITIZED (type))
(with
{
tree t1 = type;
if (INTEGRAL_TYPE_P (type)
&& TYPE_OVERFLOW_WRAPS (type) != TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
t1 = TYPE_OVERFLOW_WRAPS (type) ? type : TREE_TYPE (@1);
}
(convert (plus (convert:t1 @0) (convert:t1 @1))))))
/* -(T)(-A) -> (T)A
Sign-extension is ok except for INT_MIN, which thankfully cannot
happen without overflow. */
(simplify
(negate (convert (negate @1)))
(if (INTEGRAL_TYPE_P (type)
&& (TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@1))
|| (!TYPE_UNSIGNED (TREE_TYPE (@1))
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@1))))
&& !TYPE_OVERFLOW_SANITIZED (type)
&& !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@1)))
(convert @1)))
(simplify
(negate (convert negate_expr_p@1))
(if (SCALAR_FLOAT_TYPE_P (type)
&& ((DECIMAL_FLOAT_TYPE_P (type)
== DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@1))
&& TYPE_PRECISION (type) >= TYPE_PRECISION (TREE_TYPE (@1)))
|| !HONOR_SIGN_DEPENDENT_ROUNDING (type)))
(convert (negate @1))))
(simplify
(negate (nop_convert? (negate @1)))
(if (!TYPE_OVERFLOW_SANITIZED (type)
&& !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@1)))
(view_convert @1)))
/* We can't reassociate floating-point unless -fassociative-math
or fixed-point plus or minus because of saturation to +-Inf. */
(if ((!FLOAT_TYPE_P (type) || flag_associative_math)
&& !FIXED_POINT_TYPE_P (type))
/* Match patterns that allow contracting a plus-minus pair
irrespective of overflow issues. */
/* (A +- B) - A -> +- B */
/* (A +- B) -+ B -> A */
/* A - (A +- B) -> -+ B */
/* A +- (B -+ A) -> +- B */
(simplify
(minus (nop_convert1? (plus:c (nop_convert2? @0) @1)) @0)
(view_convert @1))
(simplify
(minus (nop_convert1? (minus (nop_convert2? @0) @1)) @0)
(if (!ANY_INTEGRAL_TYPE_P (type)
|| TYPE_OVERFLOW_WRAPS (type))
(negate (view_convert @1))
(view_convert (negate @1))))
(simplify
(plus:c (nop_convert1? (minus @0 (nop_convert2? @1))) @1)
(view_convert @0))
(simplify
(minus @0 (nop_convert1? (plus:c (nop_convert2? @0) @1)))
(if (!ANY_INTEGRAL_TYPE_P (type)
|| TYPE_OVERFLOW_WRAPS (type))
(negate (view_convert @1))
(view_convert (negate @1))))
(simplify
(minus @0 (nop_convert1? (minus (nop_convert2? @0) @1)))
(view_convert @1))
/* (A +- B) + (C - A) -> C +- B */
/* (A + B) - (A - C) -> B + C */
/* More cases are handled with comparisons. */
(simplify
(plus:c (plus:c @0 @1) (minus @2 @0))
(plus @2 @1))
(simplify
(plus:c (minus @0 @1) (minus @2 @0))
(minus @2 @1))
(simplify
(plus:c (pointer_diff @0 @1) (pointer_diff @2 @0))
(if (TYPE_OVERFLOW_UNDEFINED (type)
&& !TYPE_OVERFLOW_SANITIZED (TREE_TYPE (@0)))
(pointer_diff @2 @1)))
(simplify
(minus (plus:c @0 @1) (minus @0 @2))
(plus @1 @2))
/* (A +- CST1) +- CST2 -> A + CST3
Use view_convert because it is safe for vectors and equivalent for
scalars. */
(for outer_op (plus minus)
(for inner_op (plus minus)
neg_inner_op (minus plus)
(simplify
(outer_op (nop_convert? (inner_op @0 CONSTANT_CLASS_P@1))
CONSTANT_CLASS_P@2)
/* If one of the types wraps, use that one. */
(if (!ANY_INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_WRAPS (type))
/* If all 3 captures are CONSTANT_CLASS_P, punt, as we might recurse
forever if something doesn't simplify into a constant. */
(if (!CONSTANT_CLASS_P (@0))
(if (outer_op == PLUS_EXPR)
(plus (view_convert @0) (inner_op @2 (view_convert @1)))
(minus (view_convert @0) (neg_inner_op @2 (view_convert @1)))))
(if (!ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
|| TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
(if (outer_op == PLUS_EXPR)
(view_convert (plus @0 (inner_op (view_convert @2) @1)))
(view_convert (minus @0 (neg_inner_op (view_convert @2) @1))))
/* If the constant operation overflows we cannot do the transform
directly as we would introduce undefined overflow, for example
with (a - 1) + INT_MIN. */
(if (types_match (type, @0))
(with { tree cst = const_binop (outer_op == inner_op
? PLUS_EXPR : MINUS_EXPR,
type, @1, @2); }
(if (cst && !TREE_OVERFLOW (cst))
(inner_op @0 { cst; } )
/* X+INT_MAX+1 is X-INT_MIN. */
(if (INTEGRAL_TYPE_P (type) && cst
&& wi::to_wide (cst) == wi::min_value (type))
(neg_inner_op @0 { wide_int_to_tree (type, wi::to_wide (cst)); })
/* Last resort, use some unsigned type. */
(with { tree utype = unsigned_type_for (type); }
(if (utype)
(view_convert (inner_op