blob: b1283690080a33f89706e771d69e15a78b54ac54 [file] [log] [blame]
/* Internal functions.
Copyright (C) 2011-2021 Free Software Foundation, Inc.
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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "target.h"
#include "rtl.h"
#include "tree.h"
#include "gimple.h"
#include "predict.h"
#include "stringpool.h"
#include "tree-vrp.h"
#include "tree-ssanames.h"
#include "expmed.h"
#include "memmodel.h"
#include "optabs.h"
#include "emit-rtl.h"
#include "diagnostic-core.h"
#include "fold-const.h"
#include "internal-fn.h"
#include "stor-layout.h"
#include "dojump.h"
#include "expr.h"
#include "stringpool.h"
#include "attribs.h"
#include "asan.h"
#include "ubsan.h"
#include "recog.h"
#include "builtins.h"
#include "optabs-tree.h"
#include "gimple-ssa.h"
#include "tree-phinodes.h"
#include "ssa-iterators.h"
#include "explow.h"
#include "rtl-iter.h"
#include "gimple-range.h"
/* For lang_hooks.types.type_for_mode. */
#include "langhooks.h"
/* The names of each internal function, indexed by function number. */
const char *const internal_fn_name_array[] = {
#define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) #CODE,
#include "internal-fn.def"
"<invalid-fn>"
};
/* The ECF_* flags of each internal function, indexed by function number. */
const int internal_fn_flags_array[] = {
#define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) FLAGS,
#include "internal-fn.def"
0
};
/* Return the internal function called NAME, or IFN_LAST if there's
no such function. */
internal_fn
lookup_internal_fn (const char *name)
{
typedef hash_map<nofree_string_hash, internal_fn> name_to_fn_map_type;
static name_to_fn_map_type *name_to_fn_map;
if (!name_to_fn_map)
{
name_to_fn_map = new name_to_fn_map_type (IFN_LAST);
for (unsigned int i = 0; i < IFN_LAST; ++i)
name_to_fn_map->put (internal_fn_name (internal_fn (i)),
internal_fn (i));
}
internal_fn *entry = name_to_fn_map->get (name);
return entry ? *entry : IFN_LAST;
}
/* Fnspec of each internal function, indexed by function number. */
const_tree internal_fn_fnspec_array[IFN_LAST + 1];
void
init_internal_fns ()
{
#define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) \
if (FNSPEC) internal_fn_fnspec_array[IFN_##CODE] = \
build_string ((int) sizeof (FNSPEC) - 1, FNSPEC ? FNSPEC : "");
#include "internal-fn.def"
internal_fn_fnspec_array[IFN_LAST] = 0;
}
/* Create static initializers for the information returned by
direct_internal_fn. */
#define not_direct { -2, -2, false }
#define mask_load_direct { -1, 2, false }
#define load_lanes_direct { -1, -1, false }
#define mask_load_lanes_direct { -1, -1, false }
#define gather_load_direct { 3, 1, false }
#define len_load_direct { -1, -1, false }
#define mask_store_direct { 3, 2, false }
#define store_lanes_direct { 0, 0, false }
#define mask_store_lanes_direct { 0, 0, false }
#define vec_cond_mask_direct { 1, 0, false }
#define vec_cond_direct { 2, 0, false }
#define scatter_store_direct { 3, 1, false }
#define len_store_direct { 3, 3, false }
#define vec_set_direct { 3, 3, false }
#define unary_direct { 0, 0, true }
#define binary_direct { 0, 0, true }
#define ternary_direct { 0, 0, true }
#define cond_unary_direct { 1, 1, true }
#define cond_binary_direct { 1, 1, true }
#define cond_ternary_direct { 1, 1, true }
#define while_direct { 0, 2, false }
#define fold_extract_direct { 2, 2, false }
#define fold_left_direct { 1, 1, false }
#define mask_fold_left_direct { 1, 1, false }
#define check_ptrs_direct { 0, 0, false }
const direct_internal_fn_info direct_internal_fn_array[IFN_LAST + 1] = {
#define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) not_direct,
#define DEF_INTERNAL_OPTAB_FN(CODE, FLAGS, OPTAB, TYPE) TYPE##_direct,
#define DEF_INTERNAL_SIGNED_OPTAB_FN(CODE, FLAGS, SELECTOR, SIGNED_OPTAB, \
UNSIGNED_OPTAB, TYPE) TYPE##_direct,
#include "internal-fn.def"
not_direct
};
/* ARRAY_TYPE is an array of vector modes. Return the associated insn
for load-lanes-style optab OPTAB, or CODE_FOR_nothing if none. */
static enum insn_code
get_multi_vector_move (tree array_type, convert_optab optab)
{
machine_mode imode;
machine_mode vmode;
gcc_assert (TREE_CODE (array_type) == ARRAY_TYPE);
imode = TYPE_MODE (array_type);
vmode = TYPE_MODE (TREE_TYPE (array_type));
return convert_optab_handler (optab, imode, vmode);
}
/* Expand LOAD_LANES call STMT using optab OPTAB. */
static void
expand_load_lanes_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
{
class expand_operand ops[2];
tree type, lhs, rhs;
rtx target, mem;
lhs = gimple_call_lhs (stmt);
rhs = gimple_call_arg (stmt, 0);
type = TREE_TYPE (lhs);
target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
mem = expand_normal (rhs);
gcc_assert (MEM_P (mem));
PUT_MODE (mem, TYPE_MODE (type));
create_output_operand (&ops[0], target, TYPE_MODE (type));
create_fixed_operand (&ops[1], mem);
expand_insn (get_multi_vector_move (type, optab), 2, ops);
if (!rtx_equal_p (target, ops[0].value))
emit_move_insn (target, ops[0].value);
}
/* Expand STORE_LANES call STMT using optab OPTAB. */
static void
expand_store_lanes_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
{
class expand_operand ops[2];
tree type, lhs, rhs;
rtx target, reg;
lhs = gimple_call_lhs (stmt);
rhs = gimple_call_arg (stmt, 0);
type = TREE_TYPE (rhs);
target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
reg = expand_normal (rhs);
gcc_assert (MEM_P (target));
PUT_MODE (target, TYPE_MODE (type));
create_fixed_operand (&ops[0], target);
create_input_operand (&ops[1], reg, TYPE_MODE (type));
expand_insn (get_multi_vector_move (type, optab), 2, ops);
}
static void
expand_ANNOTATE (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in omp_device_lower pass. */
static void
expand_GOMP_USE_SIMT (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in omp_device_lower pass. */
static void
expand_GOMP_SIMT_ENTER (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* Allocate per-lane storage and begin non-uniform execution region. */
static void
expand_GOMP_SIMT_ENTER_ALLOC (internal_fn, gcall *stmt)
{
rtx target;
tree lhs = gimple_call_lhs (stmt);
if (lhs)
target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
else
target = gen_reg_rtx (Pmode);
rtx size = expand_normal (gimple_call_arg (stmt, 0));
rtx align = expand_normal (gimple_call_arg (stmt, 1));
class expand_operand ops[3];
create_output_operand (&ops[0], target, Pmode);
create_input_operand (&ops[1], size, Pmode);
create_input_operand (&ops[2], align, Pmode);
gcc_assert (targetm.have_omp_simt_enter ());
expand_insn (targetm.code_for_omp_simt_enter, 3, ops);
if (!rtx_equal_p (target, ops[0].value))
emit_move_insn (target, ops[0].value);
}
/* Deallocate per-lane storage and leave non-uniform execution region. */
static void
expand_GOMP_SIMT_EXIT (internal_fn, gcall *stmt)
{
gcc_checking_assert (!gimple_call_lhs (stmt));
rtx arg = expand_normal (gimple_call_arg (stmt, 0));
class expand_operand ops[1];
create_input_operand (&ops[0], arg, Pmode);
gcc_assert (targetm.have_omp_simt_exit ());
expand_insn (targetm.code_for_omp_simt_exit, 1, ops);
}
/* Lane index on SIMT targets: thread index in the warp on NVPTX. On targets
without SIMT execution this should be expanded in omp_device_lower pass. */
static void
expand_GOMP_SIMT_LANE (internal_fn, gcall *stmt)
{
tree lhs = gimple_call_lhs (stmt);
if (!lhs)
return;
rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
gcc_assert (targetm.have_omp_simt_lane ());
emit_insn (targetm.gen_omp_simt_lane (target));
}
/* This should get expanded in omp_device_lower pass. */
static void
expand_GOMP_SIMT_VF (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* Lane index of the first SIMT lane that supplies a non-zero argument.
This is a SIMT counterpart to GOMP_SIMD_LAST_LANE, used to represent the
lane that executed the last iteration for handling OpenMP lastprivate. */
static void
expand_GOMP_SIMT_LAST_LANE (internal_fn, gcall *stmt)
{
tree lhs = gimple_call_lhs (stmt);
if (!lhs)
return;
rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
rtx cond = expand_normal (gimple_call_arg (stmt, 0));
machine_mode mode = TYPE_MODE (TREE_TYPE (lhs));
class expand_operand ops[2];
create_output_operand (&ops[0], target, mode);
create_input_operand (&ops[1], cond, mode);
gcc_assert (targetm.have_omp_simt_last_lane ());
expand_insn (targetm.code_for_omp_simt_last_lane, 2, ops);
if (!rtx_equal_p (target, ops[0].value))
emit_move_insn (target, ops[0].value);
}
/* Non-transparent predicate used in SIMT lowering of OpenMP "ordered". */
static void
expand_GOMP_SIMT_ORDERED_PRED (internal_fn, gcall *stmt)
{
tree lhs = gimple_call_lhs (stmt);
if (!lhs)
return;
rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
rtx ctr = expand_normal (gimple_call_arg (stmt, 0));
machine_mode mode = TYPE_MODE (TREE_TYPE (lhs));
class expand_operand ops[2];
create_output_operand (&ops[0], target, mode);
create_input_operand (&ops[1], ctr, mode);
gcc_assert (targetm.have_omp_simt_ordered ());
expand_insn (targetm.code_for_omp_simt_ordered, 2, ops);
if (!rtx_equal_p (target, ops[0].value))
emit_move_insn (target, ops[0].value);
}
/* "Or" boolean reduction across SIMT lanes: return non-zero in all lanes if
any lane supplies a non-zero argument. */
static void
expand_GOMP_SIMT_VOTE_ANY (internal_fn, gcall *stmt)
{
tree lhs = gimple_call_lhs (stmt);
if (!lhs)
return;
rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
rtx cond = expand_normal (gimple_call_arg (stmt, 0));
machine_mode mode = TYPE_MODE (TREE_TYPE (lhs));
class expand_operand ops[2];
create_output_operand (&ops[0], target, mode);
create_input_operand (&ops[1], cond, mode);
gcc_assert (targetm.have_omp_simt_vote_any ());
expand_insn (targetm.code_for_omp_simt_vote_any, 2, ops);
if (!rtx_equal_p (target, ops[0].value))
emit_move_insn (target, ops[0].value);
}
/* Exchange between SIMT lanes with a "butterfly" pattern: source lane index
is destination lane index XOR given offset. */
static void
expand_GOMP_SIMT_XCHG_BFLY (internal_fn, gcall *stmt)
{
tree lhs = gimple_call_lhs (stmt);
if (!lhs)
return;
rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
rtx src = expand_normal (gimple_call_arg (stmt, 0));
rtx idx = expand_normal (gimple_call_arg (stmt, 1));
machine_mode mode = TYPE_MODE (TREE_TYPE (lhs));
class expand_operand ops[3];
create_output_operand (&ops[0], target, mode);
create_input_operand (&ops[1], src, mode);
create_input_operand (&ops[2], idx, SImode);
gcc_assert (targetm.have_omp_simt_xchg_bfly ());
expand_insn (targetm.code_for_omp_simt_xchg_bfly, 3, ops);
if (!rtx_equal_p (target, ops[0].value))
emit_move_insn (target, ops[0].value);
}
/* Exchange between SIMT lanes according to given source lane index. */
static void
expand_GOMP_SIMT_XCHG_IDX (internal_fn, gcall *stmt)
{
tree lhs = gimple_call_lhs (stmt);
if (!lhs)
return;
rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
rtx src = expand_normal (gimple_call_arg (stmt, 0));
rtx idx = expand_normal (gimple_call_arg (stmt, 1));
machine_mode mode = TYPE_MODE (TREE_TYPE (lhs));
class expand_operand ops[3];
create_output_operand (&ops[0], target, mode);
create_input_operand (&ops[1], src, mode);
create_input_operand (&ops[2], idx, SImode);
gcc_assert (targetm.have_omp_simt_xchg_idx ());
expand_insn (targetm.code_for_omp_simt_xchg_idx, 3, ops);
if (!rtx_equal_p (target, ops[0].value))
emit_move_insn (target, ops[0].value);
}
/* This should get expanded in adjust_simduid_builtins. */
static void
expand_GOMP_SIMD_LANE (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in adjust_simduid_builtins. */
static void
expand_GOMP_SIMD_VF (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in adjust_simduid_builtins. */
static void
expand_GOMP_SIMD_LAST_LANE (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in adjust_simduid_builtins. */
static void
expand_GOMP_SIMD_ORDERED_START (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in adjust_simduid_builtins. */
static void
expand_GOMP_SIMD_ORDERED_END (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_UBSAN_NULL (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_UBSAN_BOUNDS (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_UBSAN_VPTR (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_UBSAN_PTR (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_UBSAN_OBJECT_SIZE (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_HWASAN_CHECK (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* For hwasan stack tagging:
Clear tags on the dynamically allocated space.
For use after an object dynamically allocated on the stack goes out of
scope. */
static void
expand_HWASAN_ALLOCA_UNPOISON (internal_fn, gcall *gc)
{
gcc_assert (Pmode == ptr_mode);
tree restored_position = gimple_call_arg (gc, 0);
rtx restored_rtx = expand_expr (restored_position, NULL_RTX, VOIDmode,
EXPAND_NORMAL);
rtx func = init_one_libfunc ("__hwasan_tag_memory");
rtx off = expand_simple_binop (Pmode, MINUS, restored_rtx,
stack_pointer_rtx, NULL_RTX, 0,
OPTAB_WIDEN);
emit_library_call_value (func, NULL_RTX, LCT_NORMAL, VOIDmode,
virtual_stack_dynamic_rtx, Pmode,
HWASAN_STACK_BACKGROUND, QImode,
off, Pmode);
}
/* For hwasan stack tagging:
Return a tag to be used for a dynamic allocation. */
static void
expand_HWASAN_CHOOSE_TAG (internal_fn, gcall *gc)
{
tree tag = gimple_call_lhs (gc);
rtx target = expand_expr (tag, NULL_RTX, VOIDmode, EXPAND_NORMAL);
machine_mode mode = GET_MODE (target);
gcc_assert (mode == QImode);
rtx base_tag = targetm.memtag.extract_tag (hwasan_frame_base (), NULL_RTX);
gcc_assert (base_tag);
rtx tag_offset = gen_int_mode (hwasan_current_frame_tag (), QImode);
rtx chosen_tag = expand_simple_binop (QImode, PLUS, base_tag, tag_offset,
target, /* unsignedp = */1,
OPTAB_WIDEN);
chosen_tag = hwasan_truncate_to_tag_size (chosen_tag, target);
/* Really need to put the tag into the `target` RTX. */
if (chosen_tag != target)
{
rtx temp = chosen_tag;
gcc_assert (GET_MODE (chosen_tag) == mode);
emit_move_insn (target, temp);
}
hwasan_increment_frame_tag ();
}
/* For hwasan stack tagging:
Tag a region of space in the shadow stack according to the base pointer of
an object on the stack. N.b. the length provided in the internal call is
required to be aligned to HWASAN_TAG_GRANULE_SIZE. */
static void
expand_HWASAN_MARK (internal_fn, gcall *gc)
{
gcc_assert (ptr_mode == Pmode);
HOST_WIDE_INT flag = tree_to_shwi (gimple_call_arg (gc, 0));
bool is_poison = ((asan_mark_flags)flag) == ASAN_MARK_POISON;
tree base = gimple_call_arg (gc, 1);
gcc_checking_assert (TREE_CODE (base) == ADDR_EXPR);
rtx base_rtx = expand_normal (base);
rtx tag = is_poison ? HWASAN_STACK_BACKGROUND
: targetm.memtag.extract_tag (base_rtx, NULL_RTX);
rtx address = targetm.memtag.untagged_pointer (base_rtx, NULL_RTX);
tree len = gimple_call_arg (gc, 2);
rtx r_len = expand_normal (len);
rtx func = init_one_libfunc ("__hwasan_tag_memory");
emit_library_call (func, LCT_NORMAL, VOIDmode, address, Pmode,
tag, QImode, r_len, Pmode);
}
/* For hwasan stack tagging:
Store a tag into a pointer. */
static void
expand_HWASAN_SET_TAG (internal_fn, gcall *gc)
{
gcc_assert (ptr_mode == Pmode);
tree g_target = gimple_call_lhs (gc);
tree g_ptr = gimple_call_arg (gc, 0);
tree g_tag = gimple_call_arg (gc, 1);
rtx ptr = expand_normal (g_ptr);
rtx tag = expand_expr (g_tag, NULL_RTX, QImode, EXPAND_NORMAL);
rtx target = expand_normal (g_target);
rtx untagged = targetm.memtag.untagged_pointer (ptr, target);
rtx tagged_value = targetm.memtag.set_tag (untagged, tag, target);
if (tagged_value != target)
emit_move_insn (target, tagged_value);
}
/* This should get expanded in the sanopt pass. */
static void
expand_ASAN_CHECK (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_ASAN_MARK (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_ASAN_POISON (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the sanopt pass. */
static void
expand_ASAN_POISON_USE (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the tsan pass. */
static void
expand_TSAN_FUNC_EXIT (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get expanded in the lower pass. */
static void
expand_FALLTHROUGH (internal_fn, gcall *call)
{
error_at (gimple_location (call),
"invalid use of attribute %<fallthrough%>");
}
/* Return minimum precision needed to represent all values
of ARG in SIGNed integral type. */
static int
get_min_precision (tree arg, signop sign)
{
int prec = TYPE_PRECISION (TREE_TYPE (arg));
int cnt = 0;
signop orig_sign = sign;
if (TREE_CODE (arg) == INTEGER_CST)
{
int p;
if (TYPE_SIGN (TREE_TYPE (arg)) != sign)
{
widest_int w = wi::to_widest (arg);
w = wi::ext (w, prec, sign);
p = wi::min_precision (w, sign);
}
else
p = wi::min_precision (wi::to_wide (arg), sign);
return MIN (p, prec);
}
while (CONVERT_EXPR_P (arg)
&& INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (arg, 0)))
&& TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg, 0))) <= prec)
{
arg = TREE_OPERAND (arg, 0);
if (TYPE_PRECISION (TREE_TYPE (arg)) < prec)
{
if (TYPE_UNSIGNED (TREE_TYPE (arg)))
sign = UNSIGNED;
else if (sign == UNSIGNED && get_range_pos_neg (arg) != 1)
return prec + (orig_sign != sign);
prec = TYPE_PRECISION (TREE_TYPE (arg));
}
if (++cnt > 30)
return prec + (orig_sign != sign);
}
if (CONVERT_EXPR_P (arg)
&& INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (arg, 0)))
&& TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg, 0))) > prec)
{
/* We have e.g. (unsigned short) y_2 where int y_2 = (int) x_1(D);
If y_2's min precision is smaller than prec, return that. */
int oprec = get_min_precision (TREE_OPERAND (arg, 0), sign);
if (oprec < prec)
return oprec + (orig_sign != sign);
}
if (TREE_CODE (arg) != SSA_NAME)
return prec + (orig_sign != sign);
value_range r;
while (!get_global_range_query ()->range_of_expr (r, arg)
|| r.kind () != VR_RANGE)
{
gimple *g = SSA_NAME_DEF_STMT (arg);
if (is_gimple_assign (g)
&& CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (g)))
{
tree t = gimple_assign_rhs1 (g);
if (INTEGRAL_TYPE_P (TREE_TYPE (t))
&& TYPE_PRECISION (TREE_TYPE (t)) <= prec)
{
arg = t;
if (TYPE_PRECISION (TREE_TYPE (arg)) < prec)
{
if (TYPE_UNSIGNED (TREE_TYPE (arg)))
sign = UNSIGNED;
else if (sign == UNSIGNED && get_range_pos_neg (arg) != 1)
return prec + (orig_sign != sign);
prec = TYPE_PRECISION (TREE_TYPE (arg));
}
if (++cnt > 30)
return prec + (orig_sign != sign);
continue;
}
}
return prec + (orig_sign != sign);
}
if (sign == TYPE_SIGN (TREE_TYPE (arg)))
{
int p1 = wi::min_precision (r.lower_bound (), sign);
int p2 = wi::min_precision (r.upper_bound (), sign);
p1 = MAX (p1, p2);
prec = MIN (prec, p1);
}
else if (sign == UNSIGNED && !wi::neg_p (r.lower_bound (), SIGNED))
{
int p = wi::min_precision (r.upper_bound (), UNSIGNED);
prec = MIN (prec, p);
}
return prec + (orig_sign != sign);
}
/* Helper for expand_*_overflow. Set the __imag__ part to true
(1 except for signed:1 type, in which case store -1). */
static void
expand_arith_set_overflow (tree lhs, rtx target)
{
if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (lhs))) == 1
&& !TYPE_UNSIGNED (TREE_TYPE (TREE_TYPE (lhs))))
write_complex_part (target, constm1_rtx, true);
else
write_complex_part (target, const1_rtx, true);
}
/* Helper for expand_*_overflow. Store RES into the __real__ part
of TARGET. If RES has larger MODE than __real__ part of TARGET,
set the __imag__ part to 1 if RES doesn't fit into it. Similarly
if LHS has smaller precision than its mode. */
static void
expand_arith_overflow_result_store (tree lhs, rtx target,
scalar_int_mode mode, rtx res)
{
scalar_int_mode tgtmode
= as_a <scalar_int_mode> (GET_MODE_INNER (GET_MODE (target)));
rtx lres = res;
if (tgtmode != mode)
{
rtx_code_label *done_label = gen_label_rtx ();
int uns = TYPE_UNSIGNED (TREE_TYPE (TREE_TYPE (lhs)));
lres = convert_modes (tgtmode, mode, res, uns);
gcc_assert (GET_MODE_PRECISION (tgtmode) < GET_MODE_PRECISION (mode));
do_compare_rtx_and_jump (res, convert_modes (mode, tgtmode, lres, uns),
EQ, true, mode, NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
expand_arith_set_overflow (lhs, target);
emit_label (done_label);
}
int prec = TYPE_PRECISION (TREE_TYPE (TREE_TYPE (lhs)));
int tgtprec = GET_MODE_PRECISION (tgtmode);
if (prec < tgtprec)
{
rtx_code_label *done_label = gen_label_rtx ();
int uns = TYPE_UNSIGNED (TREE_TYPE (TREE_TYPE (lhs)));
res = lres;
if (uns)
{
rtx mask
= immed_wide_int_const (wi::shifted_mask (0, prec, false, tgtprec),
tgtmode);
lres = expand_simple_binop (tgtmode, AND, res, mask, NULL_RTX,
true, OPTAB_LIB_WIDEN);
}
else
{
lres = expand_shift (LSHIFT_EXPR, tgtmode, res, tgtprec - prec,
NULL_RTX, 1);
lres = expand_shift (RSHIFT_EXPR, tgtmode, lres, tgtprec - prec,
NULL_RTX, 0);
}
do_compare_rtx_and_jump (res, lres,
EQ, true, tgtmode, NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
expand_arith_set_overflow (lhs, target);
emit_label (done_label);
}
write_complex_part (target, lres, false);
}
/* Helper for expand_*_overflow. Store RES into TARGET. */
static void
expand_ubsan_result_store (rtx target, rtx res)
{
if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
/* If this is a scalar in a register that is stored in a wider mode
than the declared mode, compute the result into its declared mode
and then convert to the wider mode. Our value is the computed
expression. */
convert_move (SUBREG_REG (target), res, SUBREG_PROMOTED_SIGN (target));
else
emit_move_insn (target, res);
}
/* Add sub/add overflow checking to the statement STMT.
CODE says whether the operation is +, or -. */
void
expand_addsub_overflow (location_t loc, tree_code code, tree lhs,
tree arg0, tree arg1, bool unsr_p, bool uns0_p,
bool uns1_p, bool is_ubsan, tree *datap)
{
rtx res, target = NULL_RTX;
tree fn;
rtx_code_label *done_label = gen_label_rtx ();
rtx_code_label *do_error = gen_label_rtx ();
do_pending_stack_adjust ();
rtx op0 = expand_normal (arg0);
rtx op1 = expand_normal (arg1);
scalar_int_mode mode = SCALAR_INT_TYPE_MODE (TREE_TYPE (arg0));
int prec = GET_MODE_PRECISION (mode);
rtx sgn = immed_wide_int_const (wi::min_value (prec, SIGNED), mode);
bool do_xor = false;
if (is_ubsan)
gcc_assert (!unsr_p && !uns0_p && !uns1_p);
if (lhs)
{
target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
if (!is_ubsan)
write_complex_part (target, const0_rtx, true);
}
/* We assume both operands and result have the same precision
here (GET_MODE_BITSIZE (mode)), S stands for signed type
with that precision, U for unsigned type with that precision,
sgn for unsigned most significant bit in that precision.
s1 is signed first operand, u1 is unsigned first operand,
s2 is signed second operand, u2 is unsigned second operand,
sr is signed result, ur is unsigned result and the following
rules say how to compute result (which is always result of
the operands as if both were unsigned, cast to the right
signedness) and how to compute whether operation overflowed.
s1 + s2 -> sr
res = (S) ((U) s1 + (U) s2)
ovf = s2 < 0 ? res > s1 : res < s1 (or jump on overflow)
s1 - s2 -> sr
res = (S) ((U) s1 - (U) s2)
ovf = s2 < 0 ? res < s1 : res > s2 (or jump on overflow)
u1 + u2 -> ur
res = u1 + u2
ovf = res < u1 (or jump on carry, but RTL opts will handle it)
u1 - u2 -> ur
res = u1 - u2
ovf = res > u1 (or jump on carry, but RTL opts will handle it)
s1 + u2 -> sr
res = (S) ((U) s1 + u2)
ovf = ((U) res ^ sgn) < u2
s1 + u2 -> ur
t1 = (S) (u2 ^ sgn)
t2 = s1 + t1
res = (U) t2 ^ sgn
ovf = t1 < 0 ? t2 > s1 : t2 < s1 (or jump on overflow)
s1 - u2 -> sr
res = (S) ((U) s1 - u2)
ovf = u2 > ((U) s1 ^ sgn)
s1 - u2 -> ur
res = (U) s1 - u2
ovf = s1 < 0 || u2 > (U) s1
u1 - s2 -> sr
res = u1 - (U) s2
ovf = u1 >= ((U) s2 ^ sgn)
u1 - s2 -> ur
t1 = u1 ^ sgn
t2 = t1 - (U) s2
res = t2 ^ sgn
ovf = s2 < 0 ? (S) t2 < (S) t1 : (S) t2 > (S) t1 (or jump on overflow)
s1 + s2 -> ur
res = (U) s1 + (U) s2
ovf = s2 < 0 ? (s1 | (S) res) < 0) : (s1 & (S) res) < 0)
u1 + u2 -> sr
res = (S) (u1 + u2)
ovf = (U) res < u2 || res < 0
u1 - u2 -> sr
res = (S) (u1 - u2)
ovf = u1 >= u2 ? res < 0 : res >= 0
s1 - s2 -> ur
res = (U) s1 - (U) s2
ovf = s2 >= 0 ? ((s1 | (S) res) < 0) : ((s1 & (S) res) < 0) */
if (code == PLUS_EXPR && uns0_p && !uns1_p)
{
/* PLUS_EXPR is commutative, if operand signedness differs,
canonicalize to the first operand being signed and second
unsigned to simplify following code. */
std::swap (op0, op1);
std::swap (arg0, arg1);
uns0_p = false;
uns1_p = true;
}
/* u1 +- u2 -> ur */
if (uns0_p && uns1_p && unsr_p)
{
insn_code icode = optab_handler (code == PLUS_EXPR ? uaddv4_optab
: usubv4_optab, mode);
if (icode != CODE_FOR_nothing)
{
class expand_operand ops[4];
rtx_insn *last = get_last_insn ();
res = gen_reg_rtx (mode);
create_output_operand (&ops[0], res, mode);
create_input_operand (&ops[1], op0, mode);
create_input_operand (&ops[2], op1, mode);
create_fixed_operand (&ops[3], do_error);
if (maybe_expand_insn (icode, 4, ops))
{
last = get_last_insn ();
if (profile_status_for_fn (cfun) != PROFILE_ABSENT
&& JUMP_P (last)
&& any_condjump_p (last)
&& !find_reg_note (last, REG_BR_PROB, 0))
add_reg_br_prob_note (last,
profile_probability::very_unlikely ());
emit_jump (done_label);
goto do_error_label;
}
delete_insns_since (last);
}
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_binop (mode, code == PLUS_EXPR ? add_optab : sub_optab,
op0, op1, NULL_RTX, false, OPTAB_LIB_WIDEN);
rtx tem = op0;
/* For PLUS_EXPR, the operation is commutative, so we can pick
operand to compare against. For prec <= BITS_PER_WORD, I think
preferring REG operand is better over CONST_INT, because
the CONST_INT might enlarge the instruction or CSE would need
to figure out we'd already loaded it into a register before.
For prec > BITS_PER_WORD, I think CONST_INT might be more beneficial,
as then the multi-word comparison can be perhaps simplified. */
if (code == PLUS_EXPR
&& (prec <= BITS_PER_WORD
? (CONST_SCALAR_INT_P (op0) && REG_P (op1))
: CONST_SCALAR_INT_P (op1)))
tem = op1;
do_compare_rtx_and_jump (res, tem, code == PLUS_EXPR ? GEU : LEU,
true, mode, NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
goto do_error_label;
}
/* s1 +- u2 -> sr */
if (!uns0_p && uns1_p && !unsr_p)
{
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_binop (mode, code == PLUS_EXPR ? add_optab : sub_optab,
op0, op1, NULL_RTX, false, OPTAB_LIB_WIDEN);
rtx tem = expand_binop (mode, add_optab,
code == PLUS_EXPR ? res : op0, sgn,
NULL_RTX, false, OPTAB_LIB_WIDEN);
do_compare_rtx_and_jump (tem, op1, GEU, true, mode, NULL_RTX, NULL,
done_label, profile_probability::very_likely ());
goto do_error_label;
}
/* s1 + u2 -> ur */
if (code == PLUS_EXPR && !uns0_p && uns1_p && unsr_p)
{
op1 = expand_binop (mode, add_optab, op1, sgn, NULL_RTX, false,
OPTAB_LIB_WIDEN);
/* As we've changed op1, we have to avoid using the value range
for the original argument. */
arg1 = error_mark_node;
do_xor = true;
goto do_signed;
}
/* u1 - s2 -> ur */
if (code == MINUS_EXPR && uns0_p && !uns1_p && unsr_p)
{
op0 = expand_binop (mode, add_optab, op0, sgn, NULL_RTX, false,
OPTAB_LIB_WIDEN);
/* As we've changed op0, we have to avoid using the value range
for the original argument. */
arg0 = error_mark_node;
do_xor = true;
goto do_signed;
}
/* s1 - u2 -> ur */
if (code == MINUS_EXPR && !uns0_p && uns1_p && unsr_p)
{
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_binop (mode, sub_optab, op0, op1, NULL_RTX, false,
OPTAB_LIB_WIDEN);
int pos_neg = get_range_pos_neg (arg0);
if (pos_neg == 2)
/* If ARG0 is known to be always negative, this is always overflow. */
emit_jump (do_error);
else if (pos_neg == 3)
/* If ARG0 is not known to be always positive, check at runtime. */
do_compare_rtx_and_jump (op0, const0_rtx, LT, false, mode, NULL_RTX,
NULL, do_error, profile_probability::very_unlikely ());
do_compare_rtx_and_jump (op1, op0, LEU, true, mode, NULL_RTX, NULL,
done_label, profile_probability::very_likely ());
goto do_error_label;
}
/* u1 - s2 -> sr */
if (code == MINUS_EXPR && uns0_p && !uns1_p && !unsr_p)
{
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_binop (mode, sub_optab, op0, op1, NULL_RTX, false,
OPTAB_LIB_WIDEN);
rtx tem = expand_binop (mode, add_optab, op1, sgn, NULL_RTX, false,
OPTAB_LIB_WIDEN);
do_compare_rtx_and_jump (op0, tem, LTU, true, mode, NULL_RTX, NULL,
done_label, profile_probability::very_likely ());
goto do_error_label;
}
/* u1 + u2 -> sr */
if (code == PLUS_EXPR && uns0_p && uns1_p && !unsr_p)
{
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_binop (mode, add_optab, op0, op1, NULL_RTX, false,
OPTAB_LIB_WIDEN);
do_compare_rtx_and_jump (res, const0_rtx, LT, false, mode, NULL_RTX,
NULL, do_error, profile_probability::very_unlikely ());
rtx tem = op1;
/* The operation is commutative, so we can pick operand to compare
against. For prec <= BITS_PER_WORD, I think preferring REG operand
is better over CONST_INT, because the CONST_INT might enlarge the
instruction or CSE would need to figure out we'd already loaded it
into a register before. For prec > BITS_PER_WORD, I think CONST_INT
might be more beneficial, as then the multi-word comparison can be
perhaps simplified. */
if (prec <= BITS_PER_WORD
? (CONST_SCALAR_INT_P (op1) && REG_P (op0))
: CONST_SCALAR_INT_P (op0))
tem = op0;
do_compare_rtx_and_jump (res, tem, GEU, true, mode, NULL_RTX, NULL,
done_label, profile_probability::very_likely ());
goto do_error_label;
}
/* s1 +- s2 -> ur */
if (!uns0_p && !uns1_p && unsr_p)
{
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_binop (mode, code == PLUS_EXPR ? add_optab : sub_optab,
op0, op1, NULL_RTX, false, OPTAB_LIB_WIDEN);
int pos_neg = get_range_pos_neg (arg1);
if (code == PLUS_EXPR)
{
int pos_neg0 = get_range_pos_neg (arg0);
if (pos_neg0 != 3 && pos_neg == 3)
{
std::swap (op0, op1);
pos_neg = pos_neg0;
}
}
rtx tem;
if (pos_neg != 3)
{
tem = expand_binop (mode, ((pos_neg == 1) ^ (code == MINUS_EXPR))
? and_optab : ior_optab,
op0, res, NULL_RTX, false, OPTAB_LIB_WIDEN);
do_compare_rtx_and_jump (tem, const0_rtx, GE, false, mode, NULL,
NULL, done_label, profile_probability::very_likely ());
}
else
{
rtx_code_label *do_ior_label = gen_label_rtx ();
do_compare_rtx_and_jump (op1, const0_rtx,
code == MINUS_EXPR ? GE : LT, false, mode,
NULL_RTX, NULL, do_ior_label,
profile_probability::even ());
tem = expand_binop (mode, and_optab, op0, res, NULL_RTX, false,
OPTAB_LIB_WIDEN);
do_compare_rtx_and_jump (tem, const0_rtx, GE, false, mode, NULL_RTX,
NULL, done_label, profile_probability::very_likely ());
emit_jump (do_error);
emit_label (do_ior_label);
tem = expand_binop (mode, ior_optab, op0, res, NULL_RTX, false,
OPTAB_LIB_WIDEN);
do_compare_rtx_and_jump (tem, const0_rtx, GE, false, mode, NULL_RTX,
NULL, done_label, profile_probability::very_likely ());
}
goto do_error_label;
}
/* u1 - u2 -> sr */
if (code == MINUS_EXPR && uns0_p && uns1_p && !unsr_p)
{
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_binop (mode, sub_optab, op0, op1, NULL_RTX, false,
OPTAB_LIB_WIDEN);
rtx_code_label *op0_geu_op1 = gen_label_rtx ();
do_compare_rtx_and_jump (op0, op1, GEU, true, mode, NULL_RTX, NULL,
op0_geu_op1, profile_probability::even ());
do_compare_rtx_and_jump (res, const0_rtx, LT, false, mode, NULL_RTX,
NULL, done_label, profile_probability::very_likely ());
emit_jump (do_error);
emit_label (op0_geu_op1);
do_compare_rtx_and_jump (res, const0_rtx, GE, false, mode, NULL_RTX,
NULL, done_label, profile_probability::very_likely ());
goto do_error_label;
}
gcc_assert (!uns0_p && !uns1_p && !unsr_p);
/* s1 +- s2 -> sr */
do_signed:
{
insn_code icode = optab_handler (code == PLUS_EXPR ? addv4_optab
: subv4_optab, mode);
if (icode != CODE_FOR_nothing)
{
class expand_operand ops[4];
rtx_insn *last = get_last_insn ();
res = gen_reg_rtx (mode);
create_output_operand (&ops[0], res, mode);
create_input_operand (&ops[1], op0, mode);
create_input_operand (&ops[2], op1, mode);
create_fixed_operand (&ops[3], do_error);
if (maybe_expand_insn (icode, 4, ops))
{
last = get_last_insn ();
if (profile_status_for_fn (cfun) != PROFILE_ABSENT
&& JUMP_P (last)
&& any_condjump_p (last)
&& !find_reg_note (last, REG_BR_PROB, 0))
add_reg_br_prob_note (last,
profile_probability::very_unlikely ());
emit_jump (done_label);
goto do_error_label;
}
delete_insns_since (last);
}
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_binop (mode, code == PLUS_EXPR ? add_optab : sub_optab,
op0, op1, NULL_RTX, false, OPTAB_LIB_WIDEN);
/* If we can prove that one of the arguments (for MINUS_EXPR only
the second operand, as subtraction is not commutative) is always
non-negative or always negative, we can do just one comparison
and conditional jump. */
int pos_neg = get_range_pos_neg (arg1);
if (code == PLUS_EXPR)
{
int pos_neg0 = get_range_pos_neg (arg0);
if (pos_neg0 != 3 && pos_neg == 3)
{
std::swap (op0, op1);
pos_neg = pos_neg0;
}
}
/* Addition overflows if and only if the two operands have the same sign,
and the result has the opposite sign. Subtraction overflows if and
only if the two operands have opposite sign, and the subtrahend has
the same sign as the result. Here 0 is counted as positive. */
if (pos_neg == 3)
{
/* Compute op0 ^ op1 (operands have opposite sign). */
rtx op_xor = expand_binop (mode, xor_optab, op0, op1, NULL_RTX, false,
OPTAB_LIB_WIDEN);
/* Compute res ^ op1 (result and 2nd operand have opposite sign). */
rtx res_xor = expand_binop (mode, xor_optab, res, op1, NULL_RTX, false,
OPTAB_LIB_WIDEN);
rtx tem;
if (code == PLUS_EXPR)
{
/* Compute (res ^ op1) & ~(op0 ^ op1). */
tem = expand_unop (mode, one_cmpl_optab, op_xor, NULL_RTX, false);
tem = expand_binop (mode, and_optab, res_xor, tem, NULL_RTX, false,
OPTAB_LIB_WIDEN);
}
else
{
/* Compute (op0 ^ op1) & ~(res ^ op1). */
tem = expand_unop (mode, one_cmpl_optab, res_xor, NULL_RTX, false);
tem = expand_binop (mode, and_optab, op_xor, tem, NULL_RTX, false,
OPTAB_LIB_WIDEN);
}
/* No overflow if the result has bit sign cleared. */
do_compare_rtx_and_jump (tem, const0_rtx, GE, false, mode, NULL_RTX,
NULL, done_label, profile_probability::very_likely ());
}
/* Compare the result of the operation with the first operand.
No overflow for addition if second operand is positive and result
is larger or second operand is negative and result is smaller.
Likewise for subtraction with sign of second operand flipped. */
else
do_compare_rtx_and_jump (res, op0,
(pos_neg == 1) ^ (code == MINUS_EXPR) ? GE : LE,
false, mode, NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
}
do_error_label:
emit_label (do_error);
if (is_ubsan)
{
/* Expand the ubsan builtin call. */
push_temp_slots ();
fn = ubsan_build_overflow_builtin (code, loc, TREE_TYPE (arg0),
arg0, arg1, datap);
expand_normal (fn);
pop_temp_slots ();
do_pending_stack_adjust ();
}
else if (lhs)
expand_arith_set_overflow (lhs, target);
/* We're done. */
emit_label (done_label);
if (lhs)
{
if (is_ubsan)
expand_ubsan_result_store (target, res);
else
{
if (do_xor)
res = expand_binop (mode, add_optab, res, sgn, NULL_RTX, false,
OPTAB_LIB_WIDEN);
expand_arith_overflow_result_store (lhs, target, mode, res);
}
}
}
/* Add negate overflow checking to the statement STMT. */
static void
expand_neg_overflow (location_t loc, tree lhs, tree arg1, bool is_ubsan,
tree *datap)
{
rtx res, op1;
tree fn;
rtx_code_label *done_label, *do_error;
rtx target = NULL_RTX;
done_label = gen_label_rtx ();
do_error = gen_label_rtx ();
do_pending_stack_adjust ();
op1 = expand_normal (arg1);
scalar_int_mode mode = SCALAR_INT_TYPE_MODE (TREE_TYPE (arg1));
if (lhs)
{
target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
if (!is_ubsan)
write_complex_part (target, const0_rtx, true);
}
enum insn_code icode = optab_handler (negv3_optab, mode);
if (icode != CODE_FOR_nothing)
{
class expand_operand ops[3];
rtx_insn *last = get_last_insn ();
res = gen_reg_rtx (mode);
create_output_operand (&ops[0], res, mode);
create_input_operand (&ops[1], op1, mode);
create_fixed_operand (&ops[2], do_error);
if (maybe_expand_insn (icode, 3, ops))
{
last = get_last_insn ();
if (profile_status_for_fn (cfun) != PROFILE_ABSENT
&& JUMP_P (last)
&& any_condjump_p (last)
&& !find_reg_note (last, REG_BR_PROB, 0))
add_reg_br_prob_note (last,
profile_probability::very_unlikely ());
emit_jump (done_label);
}
else
{
delete_insns_since (last);
icode = CODE_FOR_nothing;
}
}
if (icode == CODE_FOR_nothing)
{
/* Compute the operation. On RTL level, the addition is always
unsigned. */
res = expand_unop (mode, neg_optab, op1, NULL_RTX, false);
/* Compare the operand with the most negative value. */
rtx minv = expand_normal (TYPE_MIN_VALUE (TREE_TYPE (arg1)));
do_compare_rtx_and_jump (op1, minv, NE, true, mode, NULL_RTX, NULL,
done_label, profile_probability::very_likely ());
}
emit_label (do_error);
if (is_ubsan)
{
/* Expand the ubsan builtin call. */
push_temp_slots ();
fn = ubsan_build_overflow_builtin (NEGATE_EXPR, loc, TREE_TYPE (arg1),
arg1, NULL_TREE, datap);
expand_normal (fn);
pop_temp_slots ();
do_pending_stack_adjust ();
}
else if (lhs)
expand_arith_set_overflow (lhs, target);
/* We're done. */
emit_label (done_label);
if (lhs)
{
if (is_ubsan)
expand_ubsan_result_store (target, res);
else
expand_arith_overflow_result_store (lhs, target, mode, res);
}
}
/* Return true if UNS WIDEN_MULT_EXPR with result mode WMODE and operand
mode MODE can be expanded without using a libcall. */
static bool
can_widen_mult_without_libcall (scalar_int_mode wmode, scalar_int_mode mode,
rtx op0, rtx op1, bool uns)
{
if (find_widening_optab_handler (umul_widen_optab, wmode, mode)
!= CODE_FOR_nothing)
return true;
if (find_widening_optab_handler (smul_widen_optab, wmode, mode)
!= CODE_FOR_nothing)
return true;
rtx_insn *last = get_last_insn ();
if (CONSTANT_P (op0))
op0 = convert_modes (wmode, mode, op0, uns);
else
op0 = gen_raw_REG (wmode, LAST_VIRTUAL_REGISTER + 1);
if (CONSTANT_P (op1))
op1 = convert_modes (wmode, mode, op1, uns);
else
op1 = gen_raw_REG (wmode, LAST_VIRTUAL_REGISTER + 2);
rtx ret = expand_mult (wmode, op0, op1, NULL_RTX, uns, true);
delete_insns_since (last);
return ret != NULL_RTX;
}
/* Add mul overflow checking to the statement STMT. */
static void
expand_mul_overflow (location_t loc, tree lhs, tree arg0, tree arg1,
bool unsr_p, bool uns0_p, bool uns1_p, bool is_ubsan,
tree *datap)
{
rtx res, op0, op1;
tree fn, type;
rtx_code_label *done_label, *do_error;
rtx target = NULL_RTX;
signop sign;
enum insn_code icode;
done_label = gen_label_rtx ();
do_error = gen_label_rtx ();
do_pending_stack_adjust ();
op0 = expand_normal (arg0);
op1 = expand_normal (arg1);
scalar_int_mode mode = SCALAR_INT_TYPE_MODE (TREE_TYPE (arg0));
bool uns = unsr_p;
if (lhs)
{
target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
if (!is_ubsan)
write_complex_part (target, const0_rtx, true);
}
if (is_ubsan)
gcc_assert (!unsr_p && !uns0_p && !uns1_p);
/* We assume both operands and result have the same precision
here (GET_MODE_BITSIZE (mode)), S stands for signed type
with that precision, U for unsigned type with that precision,
sgn for unsigned most significant bit in that precision.
s1 is signed first operand, u1 is unsigned first operand,
s2 is signed second operand, u2 is unsigned second operand,
sr is signed result, ur is unsigned result and the following
rules say how to compute result (which is always result of
the operands as if both were unsigned, cast to the right
signedness) and how to compute whether operation overflowed.
main_ovf (false) stands for jump on signed multiplication
overflow or the main algorithm with uns == false.
main_ovf (true) stands for jump on unsigned multiplication
overflow or the main algorithm with uns == true.
s1 * s2 -> sr
res = (S) ((U) s1 * (U) s2)
ovf = main_ovf (false)
u1 * u2 -> ur
res = u1 * u2
ovf = main_ovf (true)
s1 * u2 -> ur
res = (U) s1 * u2
ovf = (s1 < 0 && u2) || main_ovf (true)
u1 * u2 -> sr
res = (S) (u1 * u2)
ovf = res < 0 || main_ovf (true)
s1 * u2 -> sr
res = (S) ((U) s1 * u2)
ovf = (S) u2 >= 0 ? main_ovf (false)
: (s1 != 0 && (s1 != -1 || u2 != (U) res))
s1 * s2 -> ur
t1 = (s1 & s2) < 0 ? (-(U) s1) : ((U) s1)
t2 = (s1 & s2) < 0 ? (-(U) s2) : ((U) s2)
res = t1 * t2
ovf = (s1 ^ s2) < 0 ? (s1 && s2) : main_ovf (true) */
if (uns0_p && !uns1_p)
{
/* Multiplication is commutative, if operand signedness differs,
canonicalize to the first operand being signed and second
unsigned to simplify following code. */
std::swap (op0, op1);
std::swap (arg0, arg1);
uns0_p = false;
uns1_p = true;
}
int pos_neg0 = get_range_pos_neg (arg0);
int pos_neg1 = get_range_pos_neg (arg1);
/* s1 * u2 -> ur */
if (!uns0_p && uns1_p && unsr_p)
{
switch (pos_neg0)
{
case 1:
/* If s1 is non-negative, just perform normal u1 * u2 -> ur. */
goto do_main;
case 2:
/* If s1 is negative, avoid the main code, just multiply and
signal overflow if op1 is not 0. */
struct separate_ops ops;
ops.code = MULT_EXPR;
ops.type = TREE_TYPE (arg1);
ops.op0 = make_tree (ops.type, op0);
ops.op1 = make_tree (ops.type, op1);
ops.op2 = NULL_TREE;
ops.location = loc;
res = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
do_compare_rtx_and_jump (op1, const0_rtx, EQ, true, mode, NULL_RTX,
NULL, done_label, profile_probability::very_likely ());
goto do_error_label;
case 3:
if (get_min_precision (arg1, UNSIGNED)
+ get_min_precision (arg0, SIGNED) <= GET_MODE_PRECISION (mode))
{
/* If the first operand is sign extended from narrower type, the
second operand is zero extended from narrower type and
the sum of the two precisions is smaller or equal to the
result precision: if the first argument is at runtime
non-negative, maximum result will be 0x7e81 or 0x7f..fe80..01
and there will be no overflow, if the first argument is
negative and the second argument zero, the result will be
0 and there will be no overflow, if the first argument is
negative and the second argument positive, the result when
treated as signed will be negative (minimum -0x7f80 or
-0x7f..f80..0) there there will be always overflow. So, do
res = (U) (s1 * u2)
ovf = (S) res < 0 */
struct separate_ops ops;
ops.code = MULT_EXPR;
ops.type
= build_nonstandard_integer_type (GET_MODE_PRECISION (mode),
1);
ops.op0 = make_tree (ops.type, op0);
ops.op1 = make_tree (ops.type, op1);
ops.op2 = NULL_TREE;
ops.location = loc;
res = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
do_compare_rtx_and_jump (res, const0_rtx, GE, false,
mode, NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
goto do_error_label;
}
rtx_code_label *do_main_label;
do_main_label = gen_label_rtx ();
do_compare_rtx_and_jump (op0, const0_rtx, GE, false, mode, NULL_RTX,
NULL, do_main_label, profile_probability::very_likely ());
do_compare_rtx_and_jump (op1, const0_rtx, EQ, true, mode, NULL_RTX,
NULL, do_main_label, profile_probability::very_likely ());
expand_arith_set_overflow (lhs, target);
emit_label (do_main_label);
goto do_main;
default:
gcc_unreachable ();
}
}
/* u1 * u2 -> sr */
if (uns0_p && uns1_p && !unsr_p)
{
if ((pos_neg0 | pos_neg1) == 1)
{
/* If both arguments are zero extended from narrower types,
the MSB will be clear on both and so we can pretend it is
a normal s1 * s2 -> sr multiplication. */
uns0_p = false;
uns1_p = false;
}
else
uns = true;
/* Rest of handling of this case after res is computed. */
goto do_main;
}
/* s1 * u2 -> sr */
if (!uns0_p && uns1_p && !unsr_p)
{
switch (pos_neg1)
{
case 1:
goto do_main;
case 2:
/* If (S) u2 is negative (i.e. u2 is larger than maximum of S,
avoid the main code, just multiply and signal overflow
unless 0 * u2 or -1 * ((U) Smin). */
struct separate_ops ops;
ops.code = MULT_EXPR;
ops.type = TREE_TYPE (arg1);
ops.op0 = make_tree (ops.type, op0);
ops.op1 = make_tree (ops.type, op1);
ops.op2 = NULL_TREE;
ops.location = loc;
res = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
do_compare_rtx_and_jump (op0, const0_rtx, EQ, true, mode, NULL_RTX,
NULL, done_label, profile_probability::very_likely ());
do_compare_rtx_and_jump (op0, constm1_rtx, NE, true, mode, NULL_RTX,
NULL, do_error, profile_probability::very_unlikely ());
int prec;
prec = GET_MODE_PRECISION (mode);
rtx sgn;
sgn = immed_wide_int_const (wi::min_value (prec, SIGNED), mode);
do_compare_rtx_and_jump (op1, sgn, EQ, true, mode, NULL_RTX,
NULL, done_label, profile_probability::very_likely ());
goto do_error_label;
case 3:
/* Rest of handling of this case after res is computed. */
goto do_main;
default:
gcc_unreachable ();
}
}
/* s1 * s2 -> ur */
if (!uns0_p && !uns1_p && unsr_p)
{
rtx tem;
switch (pos_neg0 | pos_neg1)
{
case 1: /* Both operands known to be non-negative. */
goto do_main;
case 2: /* Both operands known to be negative. */
op0 = expand_unop (mode, neg_optab, op0, NULL_RTX, false);
op1 = expand_unop (mode, neg_optab, op1, NULL_RTX, false);
/* Avoid looking at arg0/arg1 ranges, as we've changed
the arguments. */
arg0 = error_mark_node;
arg1 = error_mark_node;
goto do_main;
case 3:
if ((pos_neg0 ^ pos_neg1) == 3)
{
/* If one operand is known to be negative and the other
non-negative, this overflows always, unless the non-negative
one is 0. Just do normal multiply and set overflow
unless one of the operands is 0. */
struct separate_ops ops;
ops.code = MULT_EXPR;
ops.type
= build_nonstandard_integer_type (GET_MODE_PRECISION (mode),
1);
ops.op0 = make_tree (ops.type, op0);
ops.op1 = make_tree (ops.type, op1);
ops.op2 = NULL_TREE;
ops.location = loc;
res = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
do_compare_rtx_and_jump (pos_neg0 == 1 ? op0 : op1, const0_rtx, EQ,
true, mode, NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
goto do_error_label;
}
if (get_min_precision (arg0, SIGNED)
+ get_min_precision (arg1, SIGNED) <= GET_MODE_PRECISION (mode))
{
/* If both operands are sign extended from narrower types and
the sum of the two precisions is smaller or equal to the
result precision: if both arguments are at runtime
non-negative, maximum result will be 0x3f01 or 0x3f..f0..01
and there will be no overflow, if both arguments are negative,
maximum result will be 0x40..00 and there will be no overflow
either, if one argument is positive and the other argument
negative, the result when treated as signed will be negative
and there will be always overflow, and if one argument is
zero and the other negative the result will be zero and no
overflow. So, do
res = (U) (s1 * s2)
ovf = (S) res < 0 */
struct separate_ops ops;
ops.code = MULT_EXPR;
ops.type
= build_nonstandard_integer_type (GET_MODE_PRECISION (mode),
1);
ops.op0 = make_tree (ops.type, op0);
ops.op1 = make_tree (ops.type, op1);
ops.op2 = NULL_TREE;
ops.location = loc;
res = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
do_compare_rtx_and_jump (res, const0_rtx, GE, false,
mode, NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
goto do_error_label;
}
/* The general case, do all the needed comparisons at runtime. */
rtx_code_label *do_main_label, *after_negate_label;
rtx rop0, rop1;
rop0 = gen_reg_rtx (mode);
rop1 = gen_reg_rtx (mode);
emit_move_insn (rop0, op0);
emit_move_insn (rop1, op1);
op0 = rop0;
op1 = rop1;
do_main_label = gen_label_rtx ();
after_negate_label = gen_label_rtx ();
tem = expand_binop (mode, and_optab, op0, op1, NULL_RTX, false,
OPTAB_LIB_WIDEN);
do_compare_rtx_and_jump (tem, const0_rtx, GE, false, mode, NULL_RTX,
NULL, after_negate_label, profile_probability::very_likely ());
/* Both arguments negative here, negate them and continue with
normal unsigned overflow checking multiplication. */
emit_move_insn (op0, expand_unop (mode, neg_optab, op0,
NULL_RTX, false));
emit_move_insn (op1, expand_unop (mode, neg_optab, op1,
NULL_RTX, false));
/* Avoid looking at arg0/arg1 ranges, as we might have changed
the arguments. */
arg0 = error_mark_node;
arg1 = error_mark_node;
emit_jump (do_main_label);
emit_label (after_negate_label);
tem = expand_binop (mode, xor_optab, op0, op1, NULL_RTX, false,
OPTAB_LIB_WIDEN);
do_compare_rtx_and_jump (tem, const0_rtx, GE, false, mode, NULL_RTX,
NULL, do_main_label,
profile_probability::very_likely ());
/* One argument is negative here, the other positive. This
overflows always, unless one of the arguments is 0. But
if e.g. s2 is 0, (U) s1 * 0 doesn't overflow, whatever s1
is, thus we can keep do_main code oring in overflow as is. */
if (pos_neg0 != 2)
do_compare_rtx_and_jump (op0, const0_rtx, EQ, true, mode, NULL_RTX,
NULL, do_main_label,
profile_probability::very_unlikely ());
if (pos_neg1 != 2)
do_compare_rtx_and_jump (op1, const0_rtx, EQ, true, mode, NULL_RTX,
NULL, do_main_label,
profile_probability::very_unlikely ());
expand_arith_set_overflow (lhs, target);
emit_label (do_main_label);
goto do_main;
default:
gcc_unreachable ();
}
}
do_main:
type = build_nonstandard_integer_type (GET_MODE_PRECISION (mode), uns);
sign = uns ? UNSIGNED : SIGNED;
icode = optab_handler (uns ? umulv4_optab : mulv4_optab, mode);
if (uns
&& (integer_pow2p (arg0) || integer_pow2p (arg1))
&& (optimize_insn_for_speed_p () || icode == CODE_FOR_nothing))
{
/* Optimize unsigned multiplication by power of 2 constant
using 2 shifts, one for result, one to extract the shifted
out bits to see if they are all zero.
Don't do this if optimizing for size and we have umulv4_optab,
in that case assume multiplication will be shorter.
This is heuristics based on the single target that provides
umulv4 right now (i?86/x86_64), if further targets add it, this
might need to be revisited.
Cases where both operands are constant should be folded already
during GIMPLE, and cases where one operand is constant but not
power of 2 are questionable, either the WIDEN_MULT_EXPR case
below can be done without multiplication, just by shifts and adds,
or we'd need to divide the result (and hope it actually doesn't
really divide nor multiply) and compare the result of the division
with the original operand. */
rtx opn0 = op0;
rtx opn1 = op1;
tree argn0 = arg0;
tree argn1 = arg1;
if (integer_pow2p (arg0))
{
std::swap (opn0, opn1);
std::swap (argn0, argn1);
}
int cnt = tree_log2 (argn1);
if (cnt >= 0 && cnt < GET_MODE_PRECISION (mode))
{
rtx upper = const0_rtx;
res = expand_shift (LSHIFT_EXPR, mode, opn0, cnt, NULL_RTX, uns);
if (cnt != 0)
upper = expand_shift (RSHIFT_EXPR, mode, opn0,
GET_MODE_PRECISION (mode) - cnt,
NULL_RTX, uns);
do_compare_rtx_and_jump (upper, const0_rtx, EQ, true, mode,
NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
goto do_error_label;
}
}
if (icode != CODE_FOR_nothing)
{
class expand_operand ops[4];
rtx_insn *last = get_last_insn ();
res = gen_reg_rtx (mode);
create_output_operand (&ops[0], res, mode);
create_input_operand (&ops[1], op0, mode);
create_input_operand (&ops[2], op1, mode);
create_fixed_operand (&ops[3], do_error);
if (maybe_expand_insn (icode, 4, ops))
{
last = get_last_insn ();
if (profile_status_for_fn (cfun) != PROFILE_ABSENT
&& JUMP_P (last)
&& any_condjump_p (last)
&& !find_reg_note (last, REG_BR_PROB, 0))
add_reg_br_prob_note (last,
profile_probability::very_unlikely ());
emit_jump (done_label);
}
else
{
delete_insns_since (last);
icode = CODE_FOR_nothing;
}
}
if (icode == CODE_FOR_nothing)
{
struct separate_ops ops;
int prec = GET_MODE_PRECISION (mode);
scalar_int_mode hmode, wmode;
ops.op0 = make_tree (type, op0);
ops.op1 = make_tree (type, op1);
ops.op2 = NULL_TREE;
ops.location = loc;
/* Optimize unsigned overflow check where we don't use the
multiplication result, just whether overflow happened.
If we can do MULT_HIGHPART_EXPR, that followed by
comparison of the result against zero is cheapest.
We'll still compute res, but it should be DCEd later. */
use_operand_p use;
gimple *use_stmt;
if (!is_ubsan
&& lhs
&& uns
&& !(uns0_p && uns1_p && !unsr_p)
&& can_mult_highpart_p (mode, uns) == 1
&& single_imm_use (lhs, &use, &use_stmt)
&& is_gimple_assign (use_stmt)
&& gimple_assign_rhs_code (use_stmt) == IMAGPART_EXPR)
goto highpart;
if (GET_MODE_2XWIDER_MODE (mode).exists (&wmode)
&& targetm.scalar_mode_supported_p (wmode)
&& can_widen_mult_without_libcall (wmode, mode, op0, op1, uns))
{
twoxwider:
ops.code = WIDEN_MULT_EXPR;
ops.type
= build_nonstandard_integer_type (GET_MODE_PRECISION (wmode), uns);
res = expand_expr_real_2 (&ops, NULL_RTX, wmode, EXPAND_NORMAL);
rtx hipart = expand_shift (RSHIFT_EXPR, wmode, res, prec,
NULL_RTX, uns);
hipart = convert_modes (mode, wmode, hipart, uns);
res = convert_modes (mode, wmode, res, uns);
if (uns)
/* For the unsigned multiplication, there was overflow if
HIPART is non-zero. */
do_compare_rtx_and_jump (hipart, const0_rtx, EQ, true, mode,
NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
else
{
/* RES is used more than once, place it in a pseudo. */
res = force_reg (mode, res);
rtx signbit = expand_shift (RSHIFT_EXPR, mode, res, prec - 1,
NULL_RTX, 0);
/* RES is low half of the double width result, HIPART
the high half. There was overflow if
HIPART is different from RES < 0 ? -1 : 0. */
do_compare_rtx_and_jump (signbit, hipart, EQ, true, mode,
NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
}
}
else if (can_mult_highpart_p (mode, uns) == 1)
{
highpart:
ops.code = MULT_HIGHPART_EXPR;
ops.type = type;
rtx hipart = expand_expr_real_2 (&ops, NULL_RTX, mode,
EXPAND_NORMAL);
ops.code = MULT_EXPR;
res = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
if (uns)
/* For the unsigned multiplication, there was overflow if
HIPART is non-zero. */
do_compare_rtx_and_jump (hipart, const0_rtx, EQ, true, mode,
NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
else
{
rtx signbit = expand_shift (RSHIFT_EXPR, mode, res, prec - 1,
NULL_RTX, 0);
/* RES is low half of the double width result, HIPART
the high half. There was overflow if
HIPART is different from RES < 0 ? -1 : 0. */
do_compare_rtx_and_jump (signbit, hipart, EQ, true, mode,
NULL_RTX, NULL, done_label,
profile_probability::very_likely ());
}
}
else if (int_mode_for_size (prec / 2, 1).exists (&hmode)
&& 2 * GET_MODE_PRECISION (hmode) == prec)
{
rtx_code_label *large_op0 = gen_label_rtx ();
rtx_code_label *small_op0_large_op1 = gen_label_rtx ();
rtx_code_label *one_small_one_large = gen_label_rtx ();
rtx_code_label *both_ops_large = gen_label_rtx ();
rtx_code_label *after_hipart_neg = uns ? NULL : gen_label_rtx ();
rtx_code_label *after_lopart_neg = uns ? NULL : gen_label_rtx ();
rtx_code_label *do_overflow = gen_label_rtx ();
rtx_code_label *hipart_different = uns ? NULL : gen_label_rtx ();
unsigned int hprec = GET_MODE_PRECISION (hmode);
rtx hipart0 = expand_shift (RSHIFT_EXPR, mode, op0, hprec,
NULL_RTX, uns);
hipart0 = convert_modes (hmode, mode, hipart0, uns);
rtx lopart0 = convert_modes (hmode, mode, op0, uns);
rtx signbit0 = const0_rtx;
if (!uns)
signbit0 = expand_shift (RSHIFT_EXPR, hmode, lopart0, hprec - 1,
NULL_RTX, 0);
rtx hipart1 = expand_shift (RSHIFT_EXPR, mode, op1, hprec,
NULL_RTX, uns);
hipart1 = convert_modes (hmode, mode, hipart1, uns);
rtx lopart1 = convert_modes (hmode, mode, op1, uns);
rtx signbit1 = const0_rtx;
if (!uns)
signbit1 = expand_shift (RSHIFT_EXPR, hmode, lopart1, hprec - 1,
NULL_RTX, 0);
res = gen_reg_rtx (mode);
/* True if op0 resp. op1 are known to be in the range of
halfstype. */
bool op0_small_p = false;
bool op1_small_p = false;
/* True if op0 resp. op1 are known to have all zeros or all ones
in the upper half of bits, but are not known to be
op{0,1}_small_p. */
bool op0_medium_p = false;
bool op1_medium_p = false;
/* -1 if op{0,1} is known to be negative, 0 if it is known to be
nonnegative, 1 if unknown. */
int op0_sign = 1;
int op1_sign = 1;
if (pos_neg0 == 1)
op0_sign = 0;
else if (pos_neg0 == 2)
op0_sign = -1;
if (pos_neg1 == 1)
op1_sign = 0;
else if (pos_neg1 == 2)
op1_sign = -1;
unsigned int mprec0 = prec;
if (arg0 != error_mark_node)
mprec0 = get_min_precision (arg0, sign);
if (mprec0 <= hprec)
op0_small_p = true;
else if (!uns && mprec0 <= hprec + 1)
op0_medium_p = true;
unsigned int mprec1 = prec;
if (arg1 != error_mark_node)
mprec1 = get_min_precision (arg1, sign);
if (mprec1 <= hprec)
op1_small_p = true;
else if (!uns && mprec1 <= hprec + 1)
op1_medium_p = true;
int smaller_sign = 1;
int larger_sign = 1;
if (op0_small_p)
{
smaller_sign = op0_sign;
larger_sign = op1_sign;
}
else if (op1_small_p)
{
smaller_sign = op1_sign;
larger_sign = op0_sign;
}
else if (op0_sign == op1_sign)
{
smaller_sign = op0_sign;
larger_sign = op0_sign;
}
if (!op0_small_p)
do_compare_rtx_and_jump (signbit0, hipart0, NE, true, hmode,
NULL_RTX, NULL, large_op0,
profile_probability::unlikely ());
if (!op1_small_p)
do_compare_rtx_and_jump (signbit1, hipart1, NE, true, hmode,
NULL_RTX, NULL, small_op0_large_op1,
profile_probability::unlikely ());
/* If both op0 and op1 are sign (!uns) or zero (uns) extended from
hmode to mode, the multiplication will never overflow. We can
do just one hmode x hmode => mode widening multiplication. */
tree halfstype = build_nonstandard_integer_type (hprec, uns);
ops.op0 = make_tree (halfstype, lopart0);
ops.op1 = make_tree (halfstype, lopart1);
ops.code = WIDEN_MULT_EXPR;
ops.type = type;
rtx thisres
= expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
emit_move_insn (res, thisres);
emit_jump (done_label);
emit_label (small_op0_large_op1);
/* If op0 is sign (!uns) or zero (uns) extended from hmode to mode,
but op1 is not, just swap the arguments and handle it as op1
sign/zero extended, op0 not. */
rtx larger = gen_reg_rtx (mode);
rtx hipart = gen_reg_rtx (hmode);
rtx lopart = gen_reg_rtx (hmode);
emit_move_insn (larger, op1);
emit_move_insn (hipart, hipart1);
emit_move_insn (lopart, lopart0);
emit_jump (one_small_one_large);
emit_label (large_op0);
if (!op1_small_p)
do_compare_rtx_and_jump (signbit1, hipart1, NE, true, hmode,
NULL_RTX, NULL, both_ops_large,
profile_probability::unlikely ());
/* If op1 is sign (!uns) or zero (uns) extended from hmode to mode,
but op0 is not, prepare larger, hipart and lopart pseudos and
handle it together with small_op0_large_op1. */
emit_move_insn (larger, op0);
emit_move_insn (hipart, hipart0);
emit_move_insn (lopart, lopart1);
emit_label (one_small_one_large);
/* lopart is the low part of the operand that is sign extended
to mode, larger is the other operand, hipart is the
high part of larger and lopart0 and lopart1 are the low parts
of both operands.
We perform lopart0 * lopart1 and lopart * hipart widening
multiplications. */
tree halfutype = build_nonstandard_integer_type (hprec, 1);
ops.op0 = make_tree (halfutype, lopart0);
ops.op1 = make_tree (halfutype, lopart1);
rtx lo0xlo1
= expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
ops.op0 = make_tree (halfutype, lopart);
ops.op1 = make_tree (halfutype, hipart);
rtx loxhi = gen_reg_rtx (mode);
rtx tem = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
emit_move_insn (loxhi, tem);
if (!uns)
{
/* if (hipart < 0) loxhi -= lopart << (bitsize / 2); */
if (larger_sign == 0)
emit_jump (after_hipart_neg);
else if (larger_sign != -1)
do_compare_rtx_and_jump (hipart, const0_rtx, GE, false, hmode,
NULL_RTX, NULL, after_hipart_neg,
profile_probability::even ());
tem = convert_modes (mode, hmode, lopart, 1);
tem = expand_shift (LSHIFT_EXPR, mode, tem, hprec, NULL_RTX, 1);
tem = expand_simple_binop (mode, MINUS, loxhi, tem, NULL_RTX,
1, OPTAB_WIDEN);
emit_move_insn (loxhi, tem);
emit_label (after_hipart_neg);
/* if (lopart < 0) loxhi -= larger; */
if (smaller_sign == 0)
emit_jump (after_lopart_neg);
else if (smaller_sign != -1)
do_compare_rtx_and_jump (lopart, const0_rtx, GE, false, hmode,
NULL_RTX, NULL, after_lopart_neg,
profile_probability::even ());
tem = expand_simple_binop (mode, MINUS, loxhi, larger, NULL_RTX,
1, OPTAB_WIDEN);
emit_move_insn (loxhi, tem);
emit_label (after_lopart_neg);
}
/* loxhi += (uns) lo0xlo1 >> (bitsize / 2); */
tem = expand_shift (RSHIFT_EXPR, mode, lo0xlo1, hprec, NULL_RTX, 1);
tem = expand_simple_binop (mode, PLUS, loxhi, tem, NULL_RTX,
1, OPTAB_WIDEN);
emit_move_insn (loxhi, tem);
/* if (loxhi >> (bitsize / 2)
== (hmode) loxhi >> (bitsize / 2 - 1)) (if !uns)
if (loxhi >> (bitsize / 2) == 0 (if uns). */
rtx hipartloxhi = expand_shift (RSHIFT_EXPR, mode, loxhi, hprec,
NULL_RTX, 0);
hipartloxhi = convert_modes (hmode, mode, hipartloxhi, 0);
rtx signbitloxhi = const0_rtx;
if (!uns)
signbitloxhi = expand_shift (RSHIFT_EXPR, hmode,
convert_modes (hmode, mode,
loxhi, 0),
hprec - 1, NULL_RTX, 0);
do_compare_rtx_and_jump (signbitloxhi, hipartloxhi, NE, true, hmode,
NULL_RTX, NULL, do_overflow,
profile_probability::very_unlikely ());
/* res = (loxhi << (bitsize / 2)) | (hmode) lo0xlo1; */
rtx loxhishifted = expand_shift (LSHIFT_EXPR, mode, loxhi, hprec,
NULL_RTX, 1);
tem = convert_modes (mode, hmode,
convert_modes (hmode, mode, lo0xlo1, 1), 1);
tem = expand_simple_binop (mode, IOR, loxhishifted, tem, res,
1, OPTAB_WIDEN);
if (tem != res)
emit_move_insn (res, tem);
emit_jump (done_label);
emit_label (both_ops_large);
/* If both operands are large (not sign (!uns) or zero (uns)
extended from hmode), then perform the full multiplication
which will be the result of the operation.
The only cases which don't overflow are for signed multiplication
some cases where both hipart0 and highpart1 are 0 or -1.
For unsigned multiplication when high parts are both non-zero
this overflows always. */
ops.code = MULT_EXPR;
ops.op0 = make_tree (type, op0);
ops.op1 = make_tree (type, op1);
tem = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
emit_move_insn (res, tem);
if (!uns)
{
if (!op0_medium_p)
{
tem = expand_simple_binop (hmode, PLUS, hipart0, const1_rtx,
NULL_RTX, 1, OPTAB_WIDEN);
do_compare_rtx_and_jump (tem, const1_rtx, GTU, true, hmode,
NULL_RTX, NULL, do_error,
profile_probability::very_unlikely ());
}
if (!op1_medium_p)
{
tem = expand_simple_binop (hmode, PLUS, hipart1, const1_rtx,
NULL_RTX, 1, OPTAB_WIDEN);
do_compare_rtx_and_jump (tem, const1_rtx, GTU, true, hmode,
NULL_RTX, NULL, do_error,
profile_probability::very_unlikely ());
}
/* At this point hipart{0,1} are both in [-1, 0]. If they are
the same, overflow happened if res is non-positive, if they
are different, overflow happened if res is positive. */
if (op0_sign != 1 && op1_sign != 1 && op0_sign != op1_sign)
emit_jump (hipart_different);
else if (op0_sign == 1 || op1_sign == 1)
do_compare_rtx_and_jump (hipart0, hipart1, NE, true, hmode,
NULL_RTX, NULL, hipart_different,
profile_probability::even ());
do_compare_rtx_and_jump (res, const0_rtx, LE, false, mode,
NULL_RTX, NULL, do_error,
profile_probability::very_unlikely ());
emit_jump (done_label);
emit_label (hipart_different);
do_compare_rtx_and_jump (res, const0_rtx, GE, false, mode,
NULL_RTX, NULL, do_error,
profile_probability::very_unlikely ());
emit_jump (done_label);
}
emit_label (do_overflow);
/* Overflow, do full multiplication and fallthru into do_error. */
ops.op0 = make_tree (type, op0);
ops.op1 = make_tree (type, op1);
tem = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
emit_move_insn (res, tem);
}
else if (GET_MODE_2XWIDER_MODE (mode).exists (&wmode)
&& targetm.scalar_mode_supported_p (wmode))
/* Even emitting a libcall is better than not detecting overflow
at all. */
goto twoxwider;
else
{
gcc_assert (!is_ubsan);
ops.code = MULT_EXPR;
ops.type = type;
res = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
emit_jump (done_label);
}
}
do_error_label:
emit_label (do_error);
if (is_ubsan)
{
/* Expand the ubsan builtin call. */
push_temp_slots ();
fn = ubsan_build_overflow_builtin (MULT_EXPR, loc, TREE_TYPE (arg0),
arg0, arg1, datap);
expand_normal (fn);
pop_temp_slots ();
do_pending_stack_adjust ();
}
else if (lhs)
expand_arith_set_overflow (lhs, target);
/* We're done. */
emit_label (done_label);
/* u1 * u2 -> sr */
if (uns0_p && uns1_p && !unsr_p)
{
rtx_code_label *all_done_label = gen_label_rtx ();
do_compare_rtx_and_jump (res, const0_rtx, GE, false, mode, NULL_RTX,
NULL, all_done_label, profile_probability::very_likely ());
expand_arith_set_overflow (lhs, target);
emit_label (all_done_label);
}
/* s1 * u2 -> sr */
if (!uns0_p && uns1_p && !unsr_p && pos_neg1 == 3)
{
rtx_code_label *all_done_label = gen_label_rtx ();
rtx_code_label *set_noovf = gen_label_rtx ();
do_compare_rtx_and_jump (op1, const0_rtx, GE, false, mode, NULL_RTX,
NULL, all_done_label, profile_probability::very_likely ());
expand_arith_set_overflow (lhs, target);
do_compare_rtx_and_jump (op0, const0_rtx, EQ, true, mode, NULL_RTX,
NULL, set_noovf, profile_probability::very_likely ());
do_compare_rtx_and_jump (op0, constm1_rtx, NE, true, mode, NULL_RTX,
NULL, all_done_label, profile_probability::very_unlikely ());
do_compare_rtx_and_jump (op1, res, NE, true, mode, NULL_RTX, NULL,
all_done_label, profile_probability::very_unlikely ());
emit_label (set_noovf);
write_complex_part (target, const0_rtx, true);
emit_label (all_done_label);
}
if (lhs)
{
if (is_ubsan)
expand_ubsan_result_store (target, res);
else
expand_arith_overflow_result_store (lhs, target, mode, res);
}
}
/* Expand UBSAN_CHECK_* internal function if it has vector operands. */
static void
expand_vector_ubsan_overflow (location_t loc, enum tree_code code, tree lhs,
tree arg0, tree arg1)
{
poly_uint64 cnt = TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0));
rtx_code_label *loop_lab = NULL;
rtx cntvar = NULL_RTX;
tree cntv = NULL_TREE;
tree eltype = TREE_TYPE (TREE_TYPE (arg0));
tree sz = TYPE_SIZE (eltype);
tree data = NULL_TREE;
tree resv = NULL_TREE;
rtx lhsr = NULL_RTX;
rtx resvr = NULL_RTX;
unsigned HOST_WIDE_INT const_cnt = 0;
bool use_loop_p = (!cnt.is_constant (&const_cnt) || const_cnt > 4);
if (lhs)
{
optab op;
lhsr = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
if (!VECTOR_MODE_P (GET_MODE (lhsr))
|| (op = optab_for_tree_code (code, TREE_TYPE (arg0),
optab_default)) == unknown_optab
|| (optab_handler (op, TYPE_MODE (TREE_TYPE (arg0)))
== CODE_FOR_nothing))
{
if (MEM_P (lhsr))
resv = make_tree (TREE_TYPE (lhs), lhsr);
else
{
resvr = assign_temp (TREE_TYPE (lhs), 1, 1);
resv = make_tree (TREE_TYPE (lhs), resvr);
}
}
}
if (use_loop_p)
{
do_pending_stack_adjust ();
loop_lab = gen_label_rtx ();
cntvar = gen_reg_rtx (TYPE_MODE (sizetype));
cntv = make_tree (sizetype, cntvar);
emit_move_insn (cntvar, const0_rtx);
emit_label (loop_lab);
}
if (TREE_CODE (arg0) != VECTOR_CST)
{
rtx arg0r = expand_normal (arg0);
arg0 = make_tree (TREE_TYPE (arg0), arg0r);
}
if (TREE_CODE (arg1) != VECTOR_CST)
{
rtx arg1r = expand_normal (arg1);
arg1 = make_tree (TREE_TYPE (arg1), arg1r);
}
for (unsigned int i = 0; i < (use_loop_p ? 1 : const_cnt); i++)
{
tree op0, op1, res = NULL_TREE;
if (use_loop_p)
{
tree atype = build_array_type_nelts (eltype, cnt);
op0 = uniform_vector_p (arg0);
if (op0 == NULL_TREE)
{
op0 = fold_build1_loc (loc, VIEW_CONVERT_EXPR, atype, arg0);
op0 = build4_loc (loc, ARRAY_REF, eltype, op0, cntv,
NULL_TREE, NULL_TREE);
}
op1 = uniform_vector_p (arg1);
if (op1 == NULL_TREE)
{
op1 = fold_build1_loc (loc, VIEW_CONVERT_EXPR, atype, arg1);
op1 = build4_loc (loc, ARRAY_REF, eltype, op1, cntv,
NULL_TREE, NULL_TREE);
}
if (resv)
{
res = fold_build1_loc (loc, VIEW_CONVERT_EXPR, atype, resv);
res = build4_loc (loc, ARRAY_REF, eltype, res, cntv,
NULL_TREE, NULL_TREE);
}
}
else
{
tree bitpos = bitsize_int (tree_to_uhwi (sz) * i);
op0 = fold_build3_loc (loc, BIT_FIELD_REF, eltype, arg0, sz, bitpos);
op1 = fold_build3_loc (loc, BIT_FIELD_REF, eltype, arg1, sz, bitpos);
if (resv)
res = fold_build3_loc (loc, BIT_FIELD_REF, eltype, resv, sz,
bitpos);
}
switch (code)
{
case PLUS_EXPR:
expand_addsub_overflow (loc, PLUS_EXPR, res, op0, op1,
false, false, false, true, &data);
break;
case MINUS_EXPR:
if (use_loop_p ? integer_zerop (arg0) : integer_zerop (op0))
expand_neg_overflow (loc, res, op1, true, &data);
else
expand_addsub_overflow (loc, MINUS_EXPR, res, op0, op1,
false, false, false, true, &data);
break;
case MULT_EXPR:
expand_mul_overflow (loc, res, op0, op1, false, false, false,
true, &data);
break;
default:
gcc_unreachable ();
}
}
if (use_loop_p)
{
struct separate_ops ops;
ops.code = PLUS_EXPR;
ops.type = TREE_TYPE (cntv);
ops.op0 = cntv;
ops.op1 = build_int_cst (TREE_TYPE (cntv), 1);
ops.op2 = NULL_TREE;
ops.location = loc;
rtx ret = expand_expr_real_2 (&ops, cntvar, TYPE_MODE (sizetype),
EXPAND_NORMAL);
if (ret != cntvar)
emit_move_insn (cntvar, ret);
rtx cntrtx = gen_int_mode (cnt, TYPE_MODE (sizetype));
do_compare_rtx_and_jump (cntvar, cntrtx, NE, false,
TYPE_MODE (sizetype), NULL_RTX, NULL, loop_lab,
profile_probability::very_likely ());
}
if (lhs && resv == NULL_TREE)
{
struct separate_ops ops;
ops.code = code;
ops.type = TREE_TYPE (arg0);
ops.op0 = arg0;
ops.op1 = arg1;
ops.op2 = NULL_TREE;
ops.location = loc;
rtx ret = expand_expr_real_2 (&ops, lhsr, TYPE_MODE (TREE_TYPE (arg0)),
EXPAND_NORMAL);
if (ret != lhsr)
emit_move_insn (lhsr, ret);
}
else if (resvr)
emit_move_insn (lhsr, resvr);
}
/* Expand UBSAN_CHECK_ADD call STMT. */
static void
expand_UBSAN_CHECK_ADD (internal_fn, gcall *stmt)
{
location_t loc = gimple_location (stmt);
tree lhs = gimple_call_lhs (stmt);
tree arg0 = gimple_call_arg (stmt, 0);
tree arg1 = gimple_call_arg (stmt, 1);
if (VECTOR_TYPE_P (TREE_TYPE (arg0)))
expand_vector_ubsan_overflow (loc, PLUS_EXPR, lhs, arg0, arg1);
else
expand_addsub_overflow (loc, PLUS_EXPR, lhs, arg0, arg1,
false, false, false, true, NULL);
}
/* Expand UBSAN_CHECK_SUB call STMT. */
static void
expand_UBSAN_CHECK_SUB (internal_fn, gcall *stmt)
{
location_t loc = gimple_location (stmt);
tree lhs = gimple_call_lhs (stmt);
tree arg0 = gimple_call_arg (stmt, 0);
tree arg1 = gimple_call_arg (stmt, 1);
if (VECTOR_TYPE_P (TREE_TYPE (arg0)))
expand_vector_ubsan_overflow (loc, MINUS_EXPR, lhs, arg0, arg1);
else if (integer_zerop (arg0))
expand_neg_overflow (loc, lhs, arg1, true, NULL);
else
expand_addsub_overflow (loc, MINUS_EXPR, lhs, arg0, arg1,
false, false, false, true, NULL);
}
/* Expand UBSAN_CHECK_MUL call STMT. */
static void
expand_UBSAN_CHECK_MUL (internal_fn, gcall *stmt)
{
location_t loc = gimple_location (stmt);
tree lhs = gimple_call_lhs (stmt);
tree arg0 = gimple_call_arg (stmt, 0);
tree arg1 = gimple_call_arg (stmt, 1);
if (VECTOR_TYPE_P (TREE_TYPE (arg0)))
expand_vector_ubsan_overflow (loc, MULT_EXPR, lhs, arg0, arg1);
else
expand_mul_overflow (loc, lhs, arg0, arg1, false, false, false, true,
NULL);
}
/* Helper function for {ADD,SUB,MUL}_OVERFLOW call stmt expansion. */
static void
expand_arith_overflow (enum tree_code code, gimple *stmt)
{
tree lhs = gimple_call_lhs (stmt);
if (lhs == NULL_TREE)
return;
tree arg0 = gimple_call_arg (stmt, 0);
tree arg1 = gimple_call_arg (stmt, 1);
tree type = TREE_TYPE (TREE_TYPE (lhs));
int uns0_p = TYPE_UNSIGNED (TREE_TYPE (arg0));
int uns1_p = TYPE_UNSIGNED (TREE_TYPE (arg1));
int unsr_p = TYPE_UNSIGNED (type);
int prec0 = TYPE_PRECISION (TREE_TYPE (arg0));
int prec1 = TYPE_PRECISION (TREE_TYPE (arg1));
int precres = TYPE_PRECISION (type);
location_t loc = gimple_location (stmt);
if (!uns0_p && get_range_pos_neg (arg0) == 1)
uns0_p = true;
if (!uns1_p && get_range_pos_neg (arg1) == 1)
uns1_p = true;
int pr = get_min_precision (arg0, uns0_p ? UNSIGNED : SIGNED);
prec0 = MIN (prec0, pr);
pr = get_min_precision (arg1, uns1_p ? UNSIGNED : SIGNED);
prec1 = MIN (prec1, pr);
/* If uns0_p && uns1_p, precop is minimum needed precision
of unsigned type to hold the exact result, otherwise
precop is minimum needed precision of signed type to
hold the exact result. */
int precop;
if (code == MULT_EXPR)
precop = prec0 + prec1 + (uns0_p != uns1_p);
else
{
if (uns0_p == uns1_p)
precop = MAX (prec0, prec1) + 1;
else if (uns0_p)
precop = MAX (prec0 + 1, prec1) + 1;
else
precop = MAX (prec0, prec1 + 1) + 1;
}
int orig_precres = precres;
do
{
if ((uns0_p && uns1_p)
? ((precop + !unsr_p) <= precres
/* u1 - u2 -> ur can overflow, no matter what precision
the result has. */
&& (code != MINUS_EXPR || !unsr_p))
: (!unsr_p && precop <= precres))
{
/* The infinity precision result will always fit into result. */
rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
write_complex_part (target, const0_rtx, true);
scalar_int_mode mode = SCALAR_INT_TYPE_MODE (type);
struct separate_ops ops;
ops.code = code;
ops.type = type;
ops.op0 = fold_convert_loc (loc, type, arg0);
ops.op1 = fold_convert_loc (loc, type, arg1);
ops.op2 = NULL_TREE;
ops.location = loc;
rtx tem = expand_expr_real_2 (&ops, NULL_RTX, mode, EXPAND_NORMAL);
expand_arith_overflow_result_store (lhs, target, mode, tem);
return;
}
/* For operations with low precision, if target doesn't have them, start
with precres widening right away, otherwise do it only if the most
simple cases can't be used. */
const int min_precision = targetm.min_arithmetic_precision ();
if (orig_precres == precres && precres < min_precision)
;
else if ((uns0_p && uns1_p && unsr_p && prec0 <= precres
&& prec1 <= precres)
|| ((!uns0_p || !uns1_p) && !unsr_p
&& prec0 + uns0_p <= precres
&& prec1 + uns1_p <= precres))
{
arg0 = fold_convert_loc (loc, type, arg0);
arg1 = fold_convert_loc (loc, type, arg1);
switch (code)
{
case MINUS_EXPR:
if (integer_zerop (arg0) && !unsr_p)
{
expand_neg_overflow (loc, lhs, arg1, false, NULL);
return;
}
/* FALLTHRU */
case PLUS_EXPR:
expand_addsub_overflow (loc, code, lhs, arg0, arg1, unsr_p,
unsr_p, unsr_p, false, NULL);
return;
case MULT_EXPR:
expand_mul_overflow (loc, lhs, arg0, arg1, unsr_p,
unsr_p, unsr_p, false, NULL);
return;
default:
gcc_unreachable ();
}
}
/* For sub-word operations, retry with a wider type first. */
if (orig_precres == precres && precop <= BITS_PER_WORD)
{
int p = MAX (min_precision, precop);
scalar_int_mode m = smallest_int_mode_for_size (p);
tree optype = build_nonstandard_integer_type (GET_MODE_PRECISION (m),
uns0_p && uns1_p
&& unsr_p);
p = TYPE_PRECISION (optype);
if (p > precres)
{
precres = p;
unsr_p = TYPE_UNSIGNED (optype);
type = optype;
continue;
}
}
if (prec0 <= precres && prec1 <= precres)
{
tree types[2];
if (unsr_p)
{
types[0] = build_nonstandard_integer_type (precres, 0);
types[1] = type;
}
else
{
types[0] = type;
types[1] = build_nonstandard_integer_type (precres, 1);
}
arg0 = fold_convert_loc (loc, types[uns0_p], arg0);
arg1 = fold_convert_loc (loc, types[uns1_p], arg1);
if (code != MULT_EXPR)
expand_addsub_overflow (loc, code, lhs, arg0, arg1, unsr_p,
uns0_p, uns1_p, false, NULL);
else
expand_mul_overflow (loc, lhs, arg0, arg1, unsr_p,
uns0_p, uns1_p, false, NULL);
return;
}
/* Retry with a wider type. */
if (orig_precres == precres)
{
int p = MAX (prec0, prec1);
scalar_int_mode m = smallest_int_mode_for_size (p);
tree optype = build_nonstandard_integer_type (GET_MODE_PRECISION (m),
uns0_p && uns1_p
&& unsr_p);
p = TYPE_PRECISION (optype);
if (p > precres)
{
precres = p;
unsr_p = TYPE_UNSIGNED (optype);
type = optype;
continue;
}
}
gcc_unreachable ();
}
while (1);
}
/* Expand ADD_OVERFLOW STMT. */
static void
expand_ADD_OVERFLOW (internal_fn, gcall *stmt)
{
expand_arith_overflow (PLUS_EXPR, stmt);
}
/* Expand SUB_OVERFLOW STMT. */
static void
expand_SUB_OVERFLOW (internal_fn, gcall *stmt)
{
expand_arith_overflow (MINUS_EXPR, stmt);
}
/* Expand MUL_OVERFLOW STMT. */
static void
expand_MUL_OVERFLOW (internal_fn, gcall *stmt)
{
expand_arith_overflow (MULT_EXPR, stmt);
}
/* This should get folded in tree-vectorizer.c. */
static void
expand_LOOP_VECTORIZED (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* This should get folded in tree-vectorizer.c. */
static void
expand_LOOP_DIST_ALIAS (internal_fn, gcall *)
{
gcc_unreachable ();
}
/* Return a memory reference of type TYPE for argument INDEX of STMT.
Use argument INDEX + 1 to derive the second (TBAA) operand. */
static tree
expand_call_mem_ref (tree type, gcall *stmt, int index)
{
tree addr = gimple_call_arg (stmt, index);
tree alias_ptr_type = TREE_TYPE (gimple_call_arg (stmt, index + 1));
unsigned int align = tree_to_shwi (gimple_call_arg (stmt, index + 1));
if (TYPE_ALIGN (type) != align)
type = build_aligned_type (type, align);
tree tmp = addr;
if (TREE_CODE (tmp) == SSA_NAME)
{
gimple *def = SSA_NAME_DEF_STMT (tmp);
if (gimple_assign_single_p (def))
tmp = gimple_assign_rhs1 (def);
}
if (TREE_CODE (tmp) == ADDR_EXPR)
{
tree mem = TREE_OPERAND (tmp, 0);
if (TREE_CODE (mem) == TARGET_MEM_REF
&& types_compatible_p (TREE_TYPE (mem), type))
{
tree offset = TMR_OFFSET (mem);
if (type != TREE_TYPE (mem)
|| alias_ptr_type != TREE_TYPE (offset)
|| !integer_zerop (offset))
{
mem = copy_node (mem);
TMR_OFFSET (mem) = wide_int_to_tree (alias_ptr_type,
wi::to_poly_wide (offset));
TREE_TYPE (mem) = type;
}
return mem;
}
}
return fold_build2 (MEM_REF, type, addr, build_int_cst (alias_ptr_type, 0));
}
/* Expand MASK_LOAD{,_LANES} or LEN_LOAD call STMT using optab OPTAB. */
static void
expand_partial_load_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
{
class expand_operand ops[3];
tree type, lhs, rhs, maskt;
rtx mem, target, mask;
insn_code icode;
maskt = gimple_call_arg (stmt, 2);
lhs = gimple_call_lhs (stmt);
if (lhs == NULL_TREE)
return;
type = TREE_TYPE