| /* This file contains the definitions and documentation for the |
| Register Transfer Expressions (rtx's) that make up the |
| Register Transfer Language (rtl) used in the Back End of the GNU compiler. |
| Copyright (C) 1987-2015 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/>. */ |
| |
| |
| /* Expression definitions and descriptions for all targets are in this file. |
| Some will not be used for some targets. |
| |
| The fields in the cpp macro call "DEF_RTL_EXPR()" |
| are used to create declarations in the C source of the compiler. |
| |
| The fields are: |
| |
| 1. The internal name of the rtx used in the C source. |
| It is a tag in the enumeration "enum rtx_code" defined in "rtl.h". |
| By convention these are in UPPER_CASE. |
| |
| 2. The name of the rtx in the external ASCII format read by |
| read_rtx(), and printed by print_rtx(). |
| These names are stored in rtx_name[]. |
| By convention these are the internal (field 1) names in lower_case. |
| |
| 3. The print format, and type of each rtx->u.fld[] (field) in this rtx. |
| These formats are stored in rtx_format[]. |
| The meaning of the formats is documented in front of this array in rtl.c |
| |
| 4. The class of the rtx. These are stored in rtx_class and are accessed |
| via the GET_RTX_CLASS macro. They are defined as follows: |
| |
| RTX_CONST_OBJ |
| an rtx code that can be used to represent a constant object |
| (e.g, CONST_INT) |
| RTX_OBJ |
| an rtx code that can be used to represent an object (e.g, REG, MEM) |
| RTX_COMPARE |
| an rtx code for a comparison (e.g, LT, GT) |
| RTX_COMM_COMPARE |
| an rtx code for a commutative comparison (e.g, EQ, NE, ORDERED) |
| RTX_UNARY |
| an rtx code for a unary arithmetic expression (e.g, NEG, NOT) |
| RTX_COMM_ARITH |
| an rtx code for a commutative binary operation (e.g,, PLUS, MULT) |
| RTX_TERNARY |
| an rtx code for a non-bitfield three input operation (IF_THEN_ELSE) |
| RTX_BIN_ARITH |
| an rtx code for a non-commutative binary operation (e.g., MINUS, DIV) |
| RTX_BITFIELD_OPS |
| an rtx code for a bit-field operation (ZERO_EXTRACT, SIGN_EXTRACT) |
| RTX_INSN |
| an rtx code for a machine insn (INSN, JUMP_INSN, CALL_INSN) or |
| data that will be output as assembly pseudo-ops (DEBUG_INSN) |
| RTX_MATCH |
| an rtx code for something that matches in insns (e.g, MATCH_DUP) |
| RTX_AUTOINC |
| an rtx code for autoincrement addressing modes (e.g. POST_DEC) |
| RTX_EXTRA |
| everything else |
| |
| All of the expressions that appear only in machine descriptions, |
| not in RTL used by the compiler itself, are at the end of the file. */ |
| |
| /* Unknown, or no such operation; the enumeration constant should have |
| value zero. */ |
| DEF_RTL_EXPR(UNKNOWN, "UnKnown", "*", RTX_EXTRA) |
| |
| /* Used in the cselib routines to describe a value. Objects of this |
| kind are only allocated in cselib.c, in an alloc pool instead of in |
| GC memory. The only operand of a VALUE is a cselib_val. |
| var-tracking requires this to have a distinct integral value from |
| DECL codes in trees. */ |
| DEF_RTL_EXPR(VALUE, "value", "0", RTX_OBJ) |
| |
| /* The RTL generated for a DEBUG_EXPR_DECL. It links back to the |
| DEBUG_EXPR_DECL in the first operand. */ |
| DEF_RTL_EXPR(DEBUG_EXPR, "debug_expr", "0", RTX_OBJ) |
| |
| /* --------------------------------------------------------------------- |
| Expressions used in constructing lists. |
| --------------------------------------------------------------------- */ |
| |
| /* A linked list of expressions. */ |
| DEF_RTL_EXPR(EXPR_LIST, "expr_list", "ee", RTX_EXTRA) |
| |
| /* A linked list of instructions. |
| The insns are represented in print by their uids. */ |
| DEF_RTL_EXPR(INSN_LIST, "insn_list", "ue", RTX_EXTRA) |
| |
| /* A linked list of integers. */ |
| DEF_RTL_EXPR(INT_LIST, "int_list", "ie", RTX_EXTRA) |
| |
| /* SEQUENCE is used in late passes of the compiler to group insns for |
| one reason or another. |
| |
| For example, after delay slot filling, branch instructions with filled |
| delay slots are represented as a SEQUENCE of length 1 + n_delay_slots, |
| with the branch instruction in XEXPVEC(seq, 0, 0) and the instructions |
| occupying the delay slots in the remaining XEXPVEC slots. |
| |
| Another place where a SEQUENCE may appear, is in REG_FRAME_RELATED_EXPR |
| notes, to express complex operations that are not obvious from the insn |
| to which the REG_FRAME_RELATED_EXPR note is attached. In this usage of |
| SEQUENCE, the sequence vector slots do not hold real instructions but |
| only pseudo-instructions that can be translated to DWARF CFA expressions. |
| |
| Some back ends also use SEQUENCE to group insns in bundles. |
| |
| Much of the compiler infrastructure is not prepared to handle SEQUENCE |
| objects. Only passes after pass_free_cfg are expected to handle them. */ |
| DEF_RTL_EXPR(SEQUENCE, "sequence", "E", RTX_EXTRA) |
| |
| /* Represents a non-global base address. This is only used in alias.c. */ |
| DEF_RTL_EXPR(ADDRESS, "address", "i", RTX_EXTRA) |
| |
| /* ---------------------------------------------------------------------- |
| Expression types used for things in the instruction chain. |
| |
| All formats must start with "iuu" to handle the chain. |
| Each insn expression holds an rtl instruction and its semantics |
| during back-end processing. |
| See macros's in "rtl.h" for the meaning of each rtx->u.fld[]. |
| |
| ---------------------------------------------------------------------- */ |
| |
| /* An annotation for variable assignment tracking. */ |
| DEF_RTL_EXPR(DEBUG_INSN, "debug_insn", "uuBeiie", RTX_INSN) |
| |
| /* An instruction that cannot jump. */ |
| DEF_RTL_EXPR(INSN, "insn", "uuBeiie", RTX_INSN) |
| |
| /* An instruction that can possibly jump. |
| Fields ( rtx->u.fld[] ) have exact same meaning as INSN's. */ |
| DEF_RTL_EXPR(JUMP_INSN, "jump_insn", "uuBeiie0", RTX_INSN) |
| |
| /* An instruction that can possibly call a subroutine |
| but which will not change which instruction comes next |
| in the current function. |
| Field ( rtx->u.fld[8] ) is CALL_INSN_FUNCTION_USAGE. |
| All other fields ( rtx->u.fld[] ) have exact same meaning as INSN's. */ |
| DEF_RTL_EXPR(CALL_INSN, "call_insn", "uuBeiiee", RTX_INSN) |
| |
| /* Placeholder for tablejump JUMP_INSNs. The pattern of this kind |
| of rtx is always either an ADDR_VEC or an ADDR_DIFF_VEC. These |
| placeholders do not appear as real instructions inside a basic |
| block, but are considered active_insn_p instructions for historical |
| reasons, when jump table data was represented with JUMP_INSNs. */ |
| DEF_RTL_EXPR(JUMP_TABLE_DATA, "jump_table_data", "uuBe0000", RTX_INSN) |
| |
| /* A marker that indicates that control will not flow through. */ |
| DEF_RTL_EXPR(BARRIER, "barrier", "uu00000", RTX_EXTRA) |
| |
| /* Holds a label that is followed by instructions. |
| Operand: |
| 3: is used in jump.c for the use-count of the label. |
| 4: is used in the sh backend. |
| 5: is a number that is unique in the entire compilation. |
| 6: is the user-given name of the label, if any. */ |
| DEF_RTL_EXPR(CODE_LABEL, "code_label", "uuB00is", RTX_EXTRA) |
| |
| /* Say where in the code a source line starts, for symbol table's sake. |
| Operand: |
| 3: note-specific data |
| 4: enum insn_note |
| 5: unique number if insn_note == note_insn_deleted_label. */ |
| DEF_RTL_EXPR(NOTE, "note", "uuB0ni", RTX_EXTRA) |
| |
| /* ---------------------------------------------------------------------- |
| Top level constituents of INSN, JUMP_INSN and CALL_INSN. |
| ---------------------------------------------------------------------- */ |
| |
| /* Conditionally execute code. |
| Operand 0 is the condition that if true, the code is executed. |
| Operand 1 is the code to be executed (typically a SET). |
| |
| Semantics are that there are no side effects if the condition |
| is false. This pattern is created automatically by the if_convert |
| pass run after reload or by target-specific splitters. */ |
| DEF_RTL_EXPR(COND_EXEC, "cond_exec", "ee", RTX_EXTRA) |
| |
| /* Several operations to be done in parallel (perhaps under COND_EXEC). */ |
| DEF_RTL_EXPR(PARALLEL, "parallel", "E", RTX_EXTRA) |
| |
| /* A string that is passed through to the assembler as input. |
| One can obviously pass comments through by using the |
| assembler comment syntax. |
| These occur in an insn all by themselves as the PATTERN. |
| They also appear inside an ASM_OPERANDS |
| as a convenient way to hold a string. */ |
| DEF_RTL_EXPR(ASM_INPUT, "asm_input", "si", RTX_EXTRA) |
| |
| /* An assembler instruction with operands. |
| 1st operand is the instruction template. |
| 2nd operand is the constraint for the output. |
| 3rd operand is the number of the output this expression refers to. |
| When an insn stores more than one value, a separate ASM_OPERANDS |
| is made for each output; this integer distinguishes them. |
| 4th is a vector of values of input operands. |
| 5th is a vector of modes and constraints for the input operands. |
| Each element is an ASM_INPUT containing a constraint string |
| and whose mode indicates the mode of the input operand. |
| 6th is a vector of labels that may be branched to by the asm. |
| 7th is the source line number. */ |
| DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEEi", RTX_EXTRA) |
| |
| /* A machine-specific operation. |
| 1st operand is a vector of operands being used by the operation so that |
| any needed reloads can be done. |
| 2nd operand is a unique value saying which of a number of machine-specific |
| operations is to be performed. |
| (Note that the vector must be the first operand because of the way that |
| genrecog.c record positions within an insn.) |
| |
| UNSPEC can occur all by itself in a PATTERN, as a component of a PARALLEL, |
| or inside an expression. |
| UNSPEC by itself or as a component of a PARALLEL |
| is currently considered not deletable. |
| |
| FIXME: Replace all uses of UNSPEC that appears by itself or as a component |
| of a PARALLEL with USE. |
| */ |
| DEF_RTL_EXPR(UNSPEC, "unspec", "Ei", RTX_EXTRA) |
| |
| /* Similar, but a volatile operation and one which may trap. */ |
| DEF_RTL_EXPR(UNSPEC_VOLATILE, "unspec_volatile", "Ei", RTX_EXTRA) |
| |
| /* ---------------------------------------------------------------------- |
| Table jump addresses. |
| ---------------------------------------------------------------------- */ |
| |
| /* Vector of addresses, stored as full words. |
| Each element is a LABEL_REF to a CODE_LABEL whose address we want. */ |
| DEF_RTL_EXPR(ADDR_VEC, "addr_vec", "E", RTX_EXTRA) |
| |
| /* Vector of address differences X0 - BASE, X1 - BASE, ... |
| First operand is BASE; the vector contains the X's. |
| The machine mode of this rtx says how much space to leave |
| for each difference and is adjusted by branch shortening if |
| CASE_VECTOR_SHORTEN_MODE is defined. |
| The third and fourth operands store the target labels with the |
| minimum and maximum addresses respectively. |
| The fifth operand stores flags for use by branch shortening. |
| Set at the start of shorten_branches: |
| min_align: the minimum alignment for any of the target labels. |
| base_after_vec: true iff BASE is after the ADDR_DIFF_VEC. |
| min_after_vec: true iff minimum addr target label is after the ADDR_DIFF_VEC. |
| max_after_vec: true iff maximum addr target label is after the ADDR_DIFF_VEC. |
| min_after_base: true iff minimum address target label is after BASE. |
| max_after_base: true iff maximum address target label is after BASE. |
| Set by the actual branch shortening process: |
| offset_unsigned: true iff offsets have to be treated as unsigned. |
| scale: scaling that is necessary to make offsets fit into the mode. |
| |
| The third, fourth and fifth operands are only valid when |
| CASE_VECTOR_SHORTEN_MODE is defined, and only in an optimizing |
| compilation. */ |
| DEF_RTL_EXPR(ADDR_DIFF_VEC, "addr_diff_vec", "eEee0", RTX_EXTRA) |
| |
| /* Memory prefetch, with attributes supported on some targets. |
| Operand 1 is the address of the memory to fetch. |
| Operand 2 is 1 for a write access, 0 otherwise. |
| Operand 3 is the level of temporal locality; 0 means there is no |
| temporal locality and 1, 2, and 3 are for increasing levels of temporal |
| locality. |
| |
| The attributes specified by operands 2 and 3 are ignored for targets |
| whose prefetch instructions do not support them. */ |
| DEF_RTL_EXPR(PREFETCH, "prefetch", "eee", RTX_EXTRA) |
| |
| /* ---------------------------------------------------------------------- |
| At the top level of an instruction (perhaps under PARALLEL). |
| ---------------------------------------------------------------------- */ |
| |
| /* Assignment. |
| Operand 1 is the location (REG, MEM, PC, CC0 or whatever) assigned to. |
| Operand 2 is the value stored there. |
| ALL assignment must use SET. |
| Instructions that do multiple assignments must use multiple SET, |
| under PARALLEL. */ |
| DEF_RTL_EXPR(SET, "set", "ee", RTX_EXTRA) |
| |
| /* Indicate something is used in a way that we don't want to explain. |
| For example, subroutine calls will use the register |
| in which the static chain is passed. |
| |
| USE can not appear as an operand of other rtx except for PARALLEL. |
| USE is not deletable, as it indicates that the operand |
| is used in some unknown way. */ |
| DEF_RTL_EXPR(USE, "use", "e", RTX_EXTRA) |
| |
| /* Indicate something is clobbered in a way that we don't want to explain. |
| For example, subroutine calls will clobber some physical registers |
| (the ones that are by convention not saved). |
| |
| CLOBBER can not appear as an operand of other rtx except for PARALLEL. |
| CLOBBER of a hard register appearing by itself (not within PARALLEL) |
| is considered undeletable before reload. */ |
| DEF_RTL_EXPR(CLOBBER, "clobber", "e", RTX_EXTRA) |
| |
| /* Call a subroutine. |
| Operand 1 is the address to call. |
| Operand 2 is the number of arguments. */ |
| |
| DEF_RTL_EXPR(CALL, "call", "ee", RTX_EXTRA) |
| |
| /* Return from a subroutine. */ |
| |
| DEF_RTL_EXPR(RETURN, "return", "", RTX_EXTRA) |
| |
| /* Like RETURN, but truly represents only a function return, while |
| RETURN may represent an insn that also performs other functions |
| of the function epilogue. Like RETURN, this may also occur in |
| conditional jumps. */ |
| DEF_RTL_EXPR(SIMPLE_RETURN, "simple_return", "", RTX_EXTRA) |
| |
| /* Special for EH return from subroutine. */ |
| |
| DEF_RTL_EXPR(EH_RETURN, "eh_return", "", RTX_EXTRA) |
| |
| /* Conditional trap. |
| Operand 1 is the condition. |
| Operand 2 is the trap code. |
| For an unconditional trap, make the condition (const_int 1). */ |
| DEF_RTL_EXPR(TRAP_IF, "trap_if", "ee", RTX_EXTRA) |
| |
| /* ---------------------------------------------------------------------- |
| Primitive values for use in expressions. |
| ---------------------------------------------------------------------- */ |
| |
| /* numeric integer constant */ |
| DEF_RTL_EXPR(CONST_INT, "const_int", "w", RTX_CONST_OBJ) |
| |
| /* numeric integer constant */ |
| DEF_RTL_EXPR(CONST_WIDE_INT, "const_wide_int", "", RTX_CONST_OBJ) |
| |
| /* fixed-point constant */ |
| DEF_RTL_EXPR(CONST_FIXED, "const_fixed", "www", RTX_CONST_OBJ) |
| |
| /* numeric floating point or integer constant. If the mode is |
| VOIDmode it is an int otherwise it has a floating point mode and a |
| floating point value. Operands hold the value. They are all 'w' |
| and there may be from 2 to 6; see real.h. */ |
| DEF_RTL_EXPR(CONST_DOUBLE, "const_double", CONST_DOUBLE_FORMAT, RTX_CONST_OBJ) |
| |
| /* Describes a vector constant. */ |
| DEF_RTL_EXPR(CONST_VECTOR, "const_vector", "E", RTX_CONST_OBJ) |
| |
| /* String constant. Used for attributes in machine descriptions and |
| for special cases in DWARF2 debug output. NOT used for source- |
| language string constants. */ |
| DEF_RTL_EXPR(CONST_STRING, "const_string", "s", RTX_OBJ) |
| |
| /* This is used to encapsulate an expression whose value is constant |
| (such as the sum of a SYMBOL_REF and a CONST_INT) so that it will be |
| recognized as a constant operand rather than by arithmetic instructions. */ |
| |
| DEF_RTL_EXPR(CONST, "const", "e", RTX_CONST_OBJ) |
| |
| /* program counter. Ordinary jumps are represented |
| by a SET whose first operand is (PC). */ |
| DEF_RTL_EXPR(PC, "pc", "", RTX_OBJ) |
| |
| /* A register. The "operand" is the register number, accessed with |
| the REGNO macro. If this number is less than FIRST_PSEUDO_REGISTER |
| than a hardware register is being referred to. The second operand |
| points to a reg_attrs structure. |
| This rtx needs to have as many (or more) fields as a MEM, since we |
| can change REG rtx's into MEMs during reload. */ |
| DEF_RTL_EXPR(REG, "reg", "i0", RTX_OBJ) |
| |
| /* A scratch register. This represents a register used only within a |
| single insn. It will be replaced by a REG during register allocation |
| or reload unless the constraint indicates that the register won't be |
| needed, in which case it can remain a SCRATCH. */ |
| DEF_RTL_EXPR(SCRATCH, "scratch", "", RTX_OBJ) |
| |
| /* A reference to a part of another value. The first operand is the |
| complete value and the second is the byte offset of the selected part. */ |
| DEF_RTL_EXPR(SUBREG, "subreg", "ei", RTX_EXTRA) |
| |
| /* This one-argument rtx is used for move instructions |
| that are guaranteed to alter only the low part of a destination. |
| Thus, (SET (SUBREG:HI (REG...)) (MEM:HI ...)) |
| has an unspecified effect on the high part of REG, |
| but (SET (STRICT_LOW_PART (SUBREG:HI (REG...))) (MEM:HI ...)) |
| is guaranteed to alter only the bits of REG that are in HImode. |
| |
| The actual instruction used is probably the same in both cases, |
| but the register constraints may be tighter when STRICT_LOW_PART |
| is in use. */ |
| |
| DEF_RTL_EXPR(STRICT_LOW_PART, "strict_low_part", "e", RTX_EXTRA) |
| |
| /* (CONCAT a b) represents the virtual concatenation of a and b |
| to make a value that has as many bits as a and b put together. |
| This is used for complex values. Normally it appears only |
| in DECL_RTLs and during RTL generation, but not in the insn chain. */ |
| DEF_RTL_EXPR(CONCAT, "concat", "ee", RTX_OBJ) |
| |
| /* (CONCATN [a1 a2 ... an]) represents the virtual concatenation of |
| all An to make a value. This is an extension of CONCAT to larger |
| number of components. Like CONCAT, it should not appear in the |
| insn chain. Every element of the CONCATN is the same size. */ |
| DEF_RTL_EXPR(CONCATN, "concatn", "E", RTX_OBJ) |
| |
| /* A memory location; operand is the address. The second operand is the |
| alias set to which this MEM belongs. We use `0' instead of `w' for this |
| field so that the field need not be specified in machine descriptions. */ |
| DEF_RTL_EXPR(MEM, "mem", "e0", RTX_OBJ) |
| |
| /* Reference to an assembler label in the code for this function. |
| The operand is a CODE_LABEL found in the insn chain. */ |
| DEF_RTL_EXPR(LABEL_REF, "label_ref", "u", RTX_CONST_OBJ) |
| |
| /* Reference to a named label: |
| Operand 0: label name |
| Operand 1: tree from which this symbol is derived, or null. |
| This is either a DECL node, or some kind of constant. */ |
| DEF_RTL_EXPR(SYMBOL_REF, "symbol_ref", "s0", RTX_CONST_OBJ) |
| |
| /* The condition code register is represented, in our imagination, |
| as a register holding a value that can be compared to zero. |
| In fact, the machine has already compared them and recorded the |
| results; but instructions that look at the condition code |
| pretend to be looking at the entire value and comparing it. */ |
| DEF_RTL_EXPR(CC0, "cc0", "", RTX_OBJ) |
| |
| /* ---------------------------------------------------------------------- |
| Expressions for operators in an rtl pattern |
| ---------------------------------------------------------------------- */ |
| |
| /* if_then_else. This is used in representing ordinary |
| conditional jump instructions. |
| Operand: |
| 0: condition |
| 1: then expr |
| 2: else expr */ |
| DEF_RTL_EXPR(IF_THEN_ELSE, "if_then_else", "eee", RTX_TERNARY) |
| |
| /* Comparison, produces a condition code result. */ |
| DEF_RTL_EXPR(COMPARE, "compare", "ee", RTX_BIN_ARITH) |
| |
| /* plus */ |
| DEF_RTL_EXPR(PLUS, "plus", "ee", RTX_COMM_ARITH) |
| |
| /* Operand 0 minus operand 1. */ |
| DEF_RTL_EXPR(MINUS, "minus", "ee", RTX_BIN_ARITH) |
| |
| /* Minus operand 0. */ |
| DEF_RTL_EXPR(NEG, "neg", "e", RTX_UNARY) |
| |
| DEF_RTL_EXPR(MULT, "mult", "ee", RTX_COMM_ARITH) |
| |
| /* Multiplication with signed saturation */ |
| DEF_RTL_EXPR(SS_MULT, "ss_mult", "ee", RTX_COMM_ARITH) |
| /* Multiplication with unsigned saturation */ |
| DEF_RTL_EXPR(US_MULT, "us_mult", "ee", RTX_COMM_ARITH) |
| |
| /* Operand 0 divided by operand 1. */ |
| DEF_RTL_EXPR(DIV, "div", "ee", RTX_BIN_ARITH) |
| /* Division with signed saturation */ |
| DEF_RTL_EXPR(SS_DIV, "ss_div", "ee", RTX_BIN_ARITH) |
| /* Division with unsigned saturation */ |
| DEF_RTL_EXPR(US_DIV, "us_div", "ee", RTX_BIN_ARITH) |
| |
| /* Remainder of operand 0 divided by operand 1. */ |
| DEF_RTL_EXPR(MOD, "mod", "ee", RTX_BIN_ARITH) |
| |
| /* Unsigned divide and remainder. */ |
| DEF_RTL_EXPR(UDIV, "udiv", "ee", RTX_BIN_ARITH) |
| DEF_RTL_EXPR(UMOD, "umod", "ee", RTX_BIN_ARITH) |
| |
| /* Bitwise operations. */ |
| DEF_RTL_EXPR(AND, "and", "ee", RTX_COMM_ARITH) |
| DEF_RTL_EXPR(IOR, "ior", "ee", RTX_COMM_ARITH) |
| DEF_RTL_EXPR(XOR, "xor", "ee", RTX_COMM_ARITH) |
| DEF_RTL_EXPR(NOT, "not", "e", RTX_UNARY) |
| |
| /* Operand: |
| 0: value to be shifted. |
| 1: number of bits. */ |
| DEF_RTL_EXPR(ASHIFT, "ashift", "ee", RTX_BIN_ARITH) /* shift left */ |
| DEF_RTL_EXPR(ROTATE, "rotate", "ee", RTX_BIN_ARITH) /* rotate left */ |
| DEF_RTL_EXPR(ASHIFTRT, "ashiftrt", "ee", RTX_BIN_ARITH) /* arithmetic shift right */ |
| DEF_RTL_EXPR(LSHIFTRT, "lshiftrt", "ee", RTX_BIN_ARITH) /* logical shift right */ |
| DEF_RTL_EXPR(ROTATERT, "rotatert", "ee", RTX_BIN_ARITH) /* rotate right */ |
| |
| /* Minimum and maximum values of two operands. We need both signed and |
| unsigned forms. (We cannot use MIN for SMIN because it conflicts |
| with a macro of the same name.) The signed variants should be used |
| with floating point. Further, if both operands are zeros, or if either |
| operand is NaN, then it is unspecified which of the two operands is |
| returned as the result. */ |
| |
| DEF_RTL_EXPR(SMIN, "smin", "ee", RTX_COMM_ARITH) |
| DEF_RTL_EXPR(SMAX, "smax", "ee", RTX_COMM_ARITH) |
| DEF_RTL_EXPR(UMIN, "umin", "ee", RTX_COMM_ARITH) |
| DEF_RTL_EXPR(UMAX, "umax", "ee", RTX_COMM_ARITH) |
| |
| /* These unary operations are used to represent incrementation |
| and decrementation as they occur in memory addresses. |
| The amount of increment or decrement are not represented |
| because they can be understood from the machine-mode of the |
| containing MEM. These operations exist in only two cases: |
| 1. pushes onto the stack. |
| 2. created automatically by the auto-inc-dec pass. */ |
| DEF_RTL_EXPR(PRE_DEC, "pre_dec", "e", RTX_AUTOINC) |
| DEF_RTL_EXPR(PRE_INC, "pre_inc", "e", RTX_AUTOINC) |
| DEF_RTL_EXPR(POST_DEC, "post_dec", "e", RTX_AUTOINC) |
| DEF_RTL_EXPR(POST_INC, "post_inc", "e", RTX_AUTOINC) |
| |
| /* These binary operations are used to represent generic address |
| side-effects in memory addresses, except for simple incrementation |
| or decrementation which use the above operations. They are |
| created automatically by the life_analysis pass in flow.c. |
| The first operand is a REG which is used as the address. |
| The second operand is an expression that is assigned to the |
| register, either before (PRE_MODIFY) or after (POST_MODIFY) |
| evaluating the address. |
| Currently, the compiler can only handle second operands of the |
| form (plus (reg) (reg)) and (plus (reg) (const_int)), where |
| the first operand of the PLUS has to be the same register as |
| the first operand of the *_MODIFY. */ |
| DEF_RTL_EXPR(PRE_MODIFY, "pre_modify", "ee", RTX_AUTOINC) |
| DEF_RTL_EXPR(POST_MODIFY, "post_modify", "ee", RTX_AUTOINC) |
| |
| /* Comparison operations. The ordered comparisons exist in two |
| flavors, signed and unsigned. */ |
| DEF_RTL_EXPR(NE, "ne", "ee", RTX_COMM_COMPARE) |
| DEF_RTL_EXPR(EQ, "eq", "ee", RTX_COMM_COMPARE) |
| DEF_RTL_EXPR(GE, "ge", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(GT, "gt", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(LE, "le", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(LT, "lt", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(GEU, "geu", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(GTU, "gtu", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(LEU, "leu", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(LTU, "ltu", "ee", RTX_COMPARE) |
| |
| /* Additional floating point unordered comparison flavors. */ |
| DEF_RTL_EXPR(UNORDERED, "unordered", "ee", RTX_COMM_COMPARE) |
| DEF_RTL_EXPR(ORDERED, "ordered", "ee", RTX_COMM_COMPARE) |
| |
| /* These are equivalent to unordered or ... */ |
| DEF_RTL_EXPR(UNEQ, "uneq", "ee", RTX_COMM_COMPARE) |
| DEF_RTL_EXPR(UNGE, "unge", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(UNGT, "ungt", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(UNLE, "unle", "ee", RTX_COMPARE) |
| DEF_RTL_EXPR(UNLT, "unlt", "ee", RTX_COMPARE) |
| |
| /* This is an ordered NE, ie !UNEQ, ie false for NaN. */ |
| DEF_RTL_EXPR(LTGT, "ltgt", "ee", RTX_COMM_COMPARE) |
| |
| /* Represents the result of sign-extending the sole operand. |
| The machine modes of the operand and of the SIGN_EXTEND expression |
| determine how much sign-extension is going on. */ |
| DEF_RTL_EXPR(SIGN_EXTEND, "sign_extend", "e", RTX_UNARY) |
| |
| /* Similar for zero-extension (such as unsigned short to int). */ |
| DEF_RTL_EXPR(ZERO_EXTEND, "zero_extend", "e", RTX_UNARY) |
| |
| /* Similar but here the operand has a wider mode. */ |
| DEF_RTL_EXPR(TRUNCATE, "truncate", "e", RTX_UNARY) |
| |
| /* Similar for extending floating-point values (such as SFmode to DFmode). */ |
| DEF_RTL_EXPR(FLOAT_EXTEND, "float_extend", "e", RTX_UNARY) |
| DEF_RTL_EXPR(FLOAT_TRUNCATE, "float_truncate", "e", RTX_UNARY) |
| |
| /* Conversion of fixed point operand to floating point value. */ |
| DEF_RTL_EXPR(FLOAT, "float", "e", RTX_UNARY) |
| |
| /* With fixed-point machine mode: |
| Conversion of floating point operand to fixed point value. |
| Value is defined only when the operand's value is an integer. |
| With floating-point machine mode (and operand with same mode): |
| Operand is rounded toward zero to produce an integer value |
| represented in floating point. */ |
| DEF_RTL_EXPR(FIX, "fix", "e", RTX_UNARY) |
| |
| /* Conversion of unsigned fixed point operand to floating point value. */ |
| DEF_RTL_EXPR(UNSIGNED_FLOAT, "unsigned_float", "e", RTX_UNARY) |
| |
| /* With fixed-point machine mode: |
| Conversion of floating point operand to *unsigned* fixed point value. |
| Value is defined only when the operand's value is an integer. */ |
| DEF_RTL_EXPR(UNSIGNED_FIX, "unsigned_fix", "e", RTX_UNARY) |
| |
| /* Conversions involving fractional fixed-point types without saturation, |
| including: |
| fractional to fractional (of different precision), |
| signed integer to fractional, |
| fractional to signed integer, |
| floating point to fractional, |
| fractional to floating point. |
| NOTE: fractional can be either signed or unsigned for conversions. */ |
| DEF_RTL_EXPR(FRACT_CONVERT, "fract_convert", "e", RTX_UNARY) |
| |
| /* Conversions involving fractional fixed-point types and unsigned integer |
| without saturation, including: |
| unsigned integer to fractional, |
| fractional to unsigned integer. |
| NOTE: fractional can be either signed or unsigned for conversions. */ |
| DEF_RTL_EXPR(UNSIGNED_FRACT_CONVERT, "unsigned_fract_convert", "e", RTX_UNARY) |
| |
| /* Conversions involving fractional fixed-point types with saturation, |
| including: |
| fractional to fractional (of different precision), |
| signed integer to fractional, |
| floating point to fractional. |
| NOTE: fractional can be either signed or unsigned for conversions. */ |
| DEF_RTL_EXPR(SAT_FRACT, "sat_fract", "e", RTX_UNARY) |
| |
| /* Conversions involving fractional fixed-point types and unsigned integer |
| with saturation, including: |
| unsigned integer to fractional. |
| NOTE: fractional can be either signed or unsigned for conversions. */ |
| DEF_RTL_EXPR(UNSIGNED_SAT_FRACT, "unsigned_sat_fract", "e", RTX_UNARY) |
| |
| /* Absolute value */ |
| DEF_RTL_EXPR(ABS, "abs", "e", RTX_UNARY) |
| |
| /* Square root */ |
| DEF_RTL_EXPR(SQRT, "sqrt", "e", RTX_UNARY) |
| |
| /* Swap bytes. */ |
| DEF_RTL_EXPR(BSWAP, "bswap", "e", RTX_UNARY) |
| |
| /* Find first bit that is set. |
| Value is 1 + number of trailing zeros in the arg., |
| or 0 if arg is 0. */ |
| DEF_RTL_EXPR(FFS, "ffs", "e", RTX_UNARY) |
| |
| /* Count number of leading redundant sign bits (number of leading |
| sign bits minus one). */ |
| DEF_RTL_EXPR(CLRSB, "clrsb", "e", RTX_UNARY) |
| |
| /* Count leading zeros. */ |
| DEF_RTL_EXPR(CLZ, "clz", "e", RTX_UNARY) |
| |
| /* Count trailing zeros. */ |
| DEF_RTL_EXPR(CTZ, "ctz", "e", RTX_UNARY) |
| |
| /* Population count (number of 1 bits). */ |
| DEF_RTL_EXPR(POPCOUNT, "popcount", "e", RTX_UNARY) |
| |
| /* Population parity (number of 1 bits modulo 2). */ |
| DEF_RTL_EXPR(PARITY, "parity", "e", RTX_UNARY) |
| |
| /* Reference to a signed bit-field of specified size and position. |
| Operand 0 is the memory unit (usually SImode or QImode) which |
| contains the field's first bit. Operand 1 is the width, in bits. |
| Operand 2 is the number of bits in the memory unit before the |
| first bit of this field. |
| If BITS_BIG_ENDIAN is defined, the first bit is the msb and |
| operand 2 counts from the msb of the memory unit. |
| Otherwise, the first bit is the lsb and operand 2 counts from |
| the lsb of the memory unit. |
| This kind of expression can not appear as an lvalue in RTL. */ |
| DEF_RTL_EXPR(SIGN_EXTRACT, "sign_extract", "eee", RTX_BITFIELD_OPS) |
| |
| /* Similar for unsigned bit-field. |
| But note! This kind of expression _can_ appear as an lvalue. */ |
| DEF_RTL_EXPR(ZERO_EXTRACT, "zero_extract", "eee", RTX_BITFIELD_OPS) |
| |
| /* For RISC machines. These save memory when splitting insns. */ |
| |
| /* HIGH are the high-order bits of a constant expression. */ |
| DEF_RTL_EXPR(HIGH, "high", "e", RTX_CONST_OBJ) |
| |
| /* LO_SUM is the sum of a register and the low-order bits |
| of a constant expression. */ |
| DEF_RTL_EXPR(LO_SUM, "lo_sum", "ee", RTX_OBJ) |
| |
| /* Describes a merge operation between two vector values. |
| Operands 0 and 1 are the vectors to be merged, operand 2 is a bitmask |
| that specifies where the parts of the result are taken from. Set bits |
| indicate operand 0, clear bits indicate operand 1. The parts are defined |
| by the mode of the vectors. */ |
| DEF_RTL_EXPR(VEC_MERGE, "vec_merge", "eee", RTX_TERNARY) |
| |
| /* Describes an operation that selects parts of a vector. |
| Operands 0 is the source vector, operand 1 is a PARALLEL that contains |
| a CONST_INT for each of the subparts of the result vector, giving the |
| number of the source subpart that should be stored into it. */ |
| DEF_RTL_EXPR(VEC_SELECT, "vec_select", "ee", RTX_BIN_ARITH) |
| |
| /* Describes a vector concat operation. Operands 0 and 1 are the source |
| vectors, the result is a vector that is as long as operands 0 and 1 |
| combined and is the concatenation of the two source vectors. */ |
| DEF_RTL_EXPR(VEC_CONCAT, "vec_concat", "ee", RTX_BIN_ARITH) |
| |
| /* Describes an operation that converts a small vector into a larger one by |
| duplicating the input values. The output vector mode must have the same |
| submodes as the input vector mode, and the number of output parts must be |
| an integer multiple of the number of input parts. */ |
| DEF_RTL_EXPR(VEC_DUPLICATE, "vec_duplicate", "e", RTX_UNARY) |
| |
| /* Addition with signed saturation */ |
| DEF_RTL_EXPR(SS_PLUS, "ss_plus", "ee", RTX_COMM_ARITH) |
| |
| /* Addition with unsigned saturation */ |
| DEF_RTL_EXPR(US_PLUS, "us_plus", "ee", RTX_COMM_ARITH) |
| |
| /* Operand 0 minus operand 1, with signed saturation. */ |
| DEF_RTL_EXPR(SS_MINUS, "ss_minus", "ee", RTX_BIN_ARITH) |
| |
| /* Negation with signed saturation. */ |
| DEF_RTL_EXPR(SS_NEG, "ss_neg", "e", RTX_UNARY) |
| /* Negation with unsigned saturation. */ |
| DEF_RTL_EXPR(US_NEG, "us_neg", "e", RTX_UNARY) |
| |
| /* Absolute value with signed saturation. */ |
| DEF_RTL_EXPR(SS_ABS, "ss_abs", "e", RTX_UNARY) |
| |
| /* Shift left with signed saturation. */ |
| DEF_RTL_EXPR(SS_ASHIFT, "ss_ashift", "ee", RTX_BIN_ARITH) |
| |
| /* Shift left with unsigned saturation. */ |
| DEF_RTL_EXPR(US_ASHIFT, "us_ashift", "ee", RTX_BIN_ARITH) |
| |
| /* Operand 0 minus operand 1, with unsigned saturation. */ |
| DEF_RTL_EXPR(US_MINUS, "us_minus", "ee", RTX_BIN_ARITH) |
| |
| /* Signed saturating truncate. */ |
| DEF_RTL_EXPR(SS_TRUNCATE, "ss_truncate", "e", RTX_UNARY) |
| |
| /* Unsigned saturating truncate. */ |
| DEF_RTL_EXPR(US_TRUNCATE, "us_truncate", "e", RTX_UNARY) |
| |
| /* Floating point multiply/add combined instruction. */ |
| DEF_RTL_EXPR(FMA, "fma", "eee", RTX_TERNARY) |
| |
| /* Information about the variable and its location. */ |
| DEF_RTL_EXPR(VAR_LOCATION, "var_location", "te", RTX_EXTRA) |
| |
| /* Used in VAR_LOCATION for a pointer to a decl that is no longer |
| addressable. */ |
| DEF_RTL_EXPR(DEBUG_IMPLICIT_PTR, "debug_implicit_ptr", "t", RTX_OBJ) |
| |
| /* Represents value that argument had on function entry. The |
| single argument is the DECL_INCOMING_RTL of the corresponding |
| parameter. */ |
| DEF_RTL_EXPR(ENTRY_VALUE, "entry_value", "0", RTX_OBJ) |
| |
| /* Used in VAR_LOCATION for a reference to a parameter that has |
| been optimized away completely. */ |
| DEF_RTL_EXPR(DEBUG_PARAMETER_REF, "debug_parameter_ref", "t", RTX_OBJ) |
| |
| /* All expressions from this point forward appear only in machine |
| descriptions. */ |
| #ifdef GENERATOR_FILE |
| |
| /* Pattern-matching operators: */ |
| |
| /* Use the function named by the second arg (the string) |
| as a predicate; if matched, store the structure that was matched |
| in the operand table at index specified by the first arg (the integer). |
| If the second arg is the null string, the structure is just stored. |
| |
| A third string argument indicates to the register allocator restrictions |
| on where the operand can be allocated. |
| |
| If the target needs no restriction on any instruction this field should |
| be the null string. |
| |
| The string is prepended by: |
| '=' to indicate the operand is only written to. |
| '+' to indicate the operand is both read and written to. |
| |
| Each character in the string represents an allocable class for an operand. |
| 'g' indicates the operand can be any valid class. |
| 'i' indicates the operand can be immediate (in the instruction) data. |
| 'r' indicates the operand can be in a register. |
| 'm' indicates the operand can be in memory. |
| 'o' a subset of the 'm' class. Those memory addressing modes that |
| can be offset at compile time (have a constant added to them). |
| |
| Other characters indicate target dependent operand classes and |
| are described in each target's machine description. |
| |
| For instructions with more than one operand, sets of classes can be |
| separated by a comma to indicate the appropriate multi-operand constraints. |
| There must be a 1 to 1 correspondence between these sets of classes in |
| all operands for an instruction. |
| */ |
| DEF_RTL_EXPR(MATCH_OPERAND, "match_operand", "iss", RTX_MATCH) |
| |
| /* Match a SCRATCH or a register. When used to generate rtl, a |
| SCRATCH is generated. As for MATCH_OPERAND, the mode specifies |
| the desired mode and the first argument is the operand number. |
| The second argument is the constraint. */ |
| DEF_RTL_EXPR(MATCH_SCRATCH, "match_scratch", "is", RTX_MATCH) |
| |
| /* Apply a predicate, AND match recursively the operands of the rtx. |
| Operand 0 is the operand-number, as in match_operand. |
| Operand 1 is a predicate to apply (as a string, a function name). |
| Operand 2 is a vector of expressions, each of which must match |
| one subexpression of the rtx this construct is matching. */ |
| DEF_RTL_EXPR(MATCH_OPERATOR, "match_operator", "isE", RTX_MATCH) |
| |
| /* Match a PARALLEL of arbitrary length. The predicate is applied |
| to the PARALLEL and the initial expressions in the PARALLEL are matched. |
| Operand 0 is the operand-number, as in match_operand. |
| Operand 1 is a predicate to apply to the PARALLEL. |
| Operand 2 is a vector of expressions, each of which must match the |
| corresponding element in the PARALLEL. */ |
| DEF_RTL_EXPR(MATCH_PARALLEL, "match_parallel", "isE", RTX_MATCH) |
| |
| /* Match only something equal to what is stored in the operand table |
| at the index specified by the argument. Use with MATCH_OPERAND. */ |
| DEF_RTL_EXPR(MATCH_DUP, "match_dup", "i", RTX_MATCH) |
| |
| /* Match only something equal to what is stored in the operand table |
| at the index specified by the argument. Use with MATCH_OPERATOR. */ |
| DEF_RTL_EXPR(MATCH_OP_DUP, "match_op_dup", "iE", RTX_MATCH) |
| |
| /* Match only something equal to what is stored in the operand table |
| at the index specified by the argument. Use with MATCH_PARALLEL. */ |
| DEF_RTL_EXPR(MATCH_PAR_DUP, "match_par_dup", "iE", RTX_MATCH) |
| |
| /* Appears only in define_predicate/define_special_predicate |
| expressions. Evaluates true only if the operand has an RTX code |
| from the set given by the argument (a comma-separated list). If the |
| second argument is present and nonempty, it is a sequence of digits |
| and/or letters which indicates the subexpression to test, using the |
| same syntax as genextract/genrecog's location strings: 0-9 for |
| XEXP (op, n), a-z for XVECEXP (op, 0, n); each character applies to |
| the result of the one before it. */ |
| DEF_RTL_EXPR(MATCH_CODE, "match_code", "ss", RTX_MATCH) |
| |
| /* Used to inject a C conditional expression into an .md file. It can |
| appear in a predicate definition or an attribute expression. */ |
| DEF_RTL_EXPR(MATCH_TEST, "match_test", "s", RTX_MATCH) |
| |
| /* Insn (and related) definitions. */ |
| |
| /* Definition of the pattern for one kind of instruction. |
| Operand: |
| 0: names this instruction. |
| If the name is the null string, the instruction is in the |
| machine description just to be recognized, and will never be emitted by |
| the tree to rtl expander. |
| 1: is the pattern. |
| 2: is a string which is a C expression |
| giving an additional condition for recognizing this pattern. |
| A null string means no extra condition. |
| 3: is the action to execute if this pattern is matched. |
| If this assembler code template starts with a * then it is a fragment of |
| C code to run to decide on a template to use. Otherwise, it is the |
| template to use. |
| 4: optionally, a vector of attributes for this insn. |
| */ |
| DEF_RTL_EXPR(DEFINE_INSN, "define_insn", "sEsTV", RTX_EXTRA) |
| |
| /* Definition of a peephole optimization. |
| 1st operand: vector of insn patterns to match |
| 2nd operand: C expression that must be true |
| 3rd operand: template or C code to produce assembler output. |
| 4: optionally, a vector of attributes for this insn. |
| |
| This form is deprecated; use define_peephole2 instead. */ |
| DEF_RTL_EXPR(DEFINE_PEEPHOLE, "define_peephole", "EsTV", RTX_EXTRA) |
| |
| /* Definition of a split operation. |
| 1st operand: insn pattern to match |
| 2nd operand: C expression that must be true |
| 3rd operand: vector of insn patterns to place into a SEQUENCE |
| 4th operand: optionally, some C code to execute before generating the |
| insns. This might, for example, create some RTX's and store them in |
| elements of `recog_data.operand' for use by the vector of |
| insn-patterns. |
| (`operands' is an alias here for `recog_data.operand'). */ |
| DEF_RTL_EXPR(DEFINE_SPLIT, "define_split", "EsES", RTX_EXTRA) |
| |
| /* Definition of an insn and associated split. |
| This is the concatenation, with a few modifications, of a define_insn |
| and a define_split which share the same pattern. |
| Operand: |
| 0: names this instruction. |
| If the name is the null string, the instruction is in the |
| machine description just to be recognized, and will never be emitted by |
| the tree to rtl expander. |
| 1: is the pattern. |
| 2: is a string which is a C expression |
| giving an additional condition for recognizing this pattern. |
| A null string means no extra condition. |
| 3: is the action to execute if this pattern is matched. |
| If this assembler code template starts with a * then it is a fragment of |
| C code to run to decide on a template to use. Otherwise, it is the |
| template to use. |
| 4: C expression that must be true for split. This may start with "&&" |
| in which case the split condition is the logical and of the insn |
| condition and what follows the "&&" of this operand. |
| 5: vector of insn patterns to place into a SEQUENCE |
| 6: optionally, some C code to execute before generating the |
| insns. This might, for example, create some RTX's and store them in |
| elements of `recog_data.operand' for use by the vector of |
| insn-patterns. |
| (`operands' is an alias here for `recog_data.operand'). |
| 7: optionally, a vector of attributes for this insn. */ |
| DEF_RTL_EXPR(DEFINE_INSN_AND_SPLIT, "define_insn_and_split", "sEsTsESV", RTX_EXTRA) |
| |
| /* Definition of an RTL peephole operation. |
| Follows the same arguments as define_split. */ |
| DEF_RTL_EXPR(DEFINE_PEEPHOLE2, "define_peephole2", "EsES", RTX_EXTRA) |
| |
| /* Define how to generate multiple insns for a standard insn name. |
| 1st operand: the insn name. |
| 2nd operand: vector of insn-patterns. |
| Use match_operand to substitute an element of `recog_data.operand'. |
| 3rd operand: C expression that must be true for this to be available. |
| This may not test any operands. |
| 4th operand: Extra C code to execute before generating the insns. |
| This might, for example, create some RTX's and store them in |
| elements of `recog_data.operand' for use by the vector of |
| insn-patterns. |
| (`operands' is an alias here for `recog_data.operand'). |
| 5th: optionally, a vector of attributes for this expand. */ |
| DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEssV", RTX_EXTRA) |
| |
| /* Define a requirement for delay slots. |
| 1st operand: Condition involving insn attributes that, if true, |
| indicates that the insn requires the number of delay slots |
| shown. |
| 2nd operand: Vector whose length is the three times the number of delay |
| slots required. |
| Each entry gives three conditions, each involving attributes. |
| The first must be true for an insn to occupy that delay slot |
| location. The second is true for all insns that can be |
| annulled if the branch is true and the third is true for all |
| insns that can be annulled if the branch is false. |
| |
| Multiple DEFINE_DELAYs may be present. They indicate differing |
| requirements for delay slots. */ |
| DEF_RTL_EXPR(DEFINE_DELAY, "define_delay", "eE", RTX_EXTRA) |
| |
| /* Define attribute computation for `asm' instructions. */ |
| DEF_RTL_EXPR(DEFINE_ASM_ATTRIBUTES, "define_asm_attributes", "V", RTX_EXTRA) |
| |
| /* Definition of a conditional execution meta operation. Automatically |
| generates new instances of DEFINE_INSN, selected by having attribute |
| "predicable" true. The new pattern will contain a COND_EXEC and the |
| predicate at top-level. |
| |
| Operand: |
| 0: The predicate pattern. The top-level form should match a |
| relational operator. Operands should have only one alternative. |
| 1: A C expression giving an additional condition for recognizing |
| the generated pattern. |
| 2: A template or C code to produce assembler output. |
| 3: A vector of attributes to append to the resulting cond_exec insn. */ |
| DEF_RTL_EXPR(DEFINE_COND_EXEC, "define_cond_exec", "EssV", RTX_EXTRA) |
| |
| /* Definition of an operand predicate. The difference between |
| DEFINE_PREDICATE and DEFINE_SPECIAL_PREDICATE is that genrecog will |
| not warn about a match_operand with no mode if it has a predicate |
| defined with DEFINE_SPECIAL_PREDICATE. |
| |
| Operand: |
| 0: The name of the predicate. |
| 1: A boolean expression which computes whether or not the predicate |
| matches. This expression can use IOR, AND, NOT, MATCH_OPERAND, |
| MATCH_CODE, and MATCH_TEST. It must be specific enough that genrecog |
| can calculate the set of RTX codes that can possibly match. |
| 2: A C function body which must return true for the predicate to match. |
| Optional. Use this when the test is too complicated to fit into a |
| match_test expression. */ |
| DEF_RTL_EXPR(DEFINE_PREDICATE, "define_predicate", "ses", RTX_EXTRA) |
| DEF_RTL_EXPR(DEFINE_SPECIAL_PREDICATE, "define_special_predicate", "ses", RTX_EXTRA) |
| |
| /* Definition of a register operand constraint. This simply maps the |
| constraint string to a register class. |
| |
| Operand: |
| 0: The name of the constraint (often, but not always, a single letter). |
| 1: A C expression which evaluates to the appropriate register class for |
| this constraint. If this is not just a constant, it should look only |
| at -m switches and the like. |
| 2: A docstring for this constraint, in Texinfo syntax; not currently |
| used, in future will be incorporated into the manual's list of |
| machine-specific operand constraints. */ |
| DEF_RTL_EXPR(DEFINE_REGISTER_CONSTRAINT, "define_register_constraint", "sss", RTX_EXTRA) |
| |
| /* Definition of a non-register operand constraint. These look at the |
| operand and decide whether it fits the constraint. |
| |
| DEFINE_CONSTRAINT gets no special treatment if it fails to match. |
| It is appropriate for constant-only constraints, and most others. |
| |
| DEFINE_MEMORY_CONSTRAINT tells reload that this constraint can be made |
| to match, if it doesn't already, by converting the operand to the form |
| (mem (reg X)) where X is a base register. It is suitable for constraints |
| that describe a subset of all memory references. |
| |
| DEFINE_ADDRESS_CONSTRAINT tells reload that this constraint can be made |
| to match, if it doesn't already, by converting the operand to the form |
| (reg X) where X is a base register. It is suitable for constraints that |
| describe a subset of all address references. |
| |
| When in doubt, use plain DEFINE_CONSTRAINT. |
| |
| Operand: |
| 0: The name of the constraint (often, but not always, a single letter). |
| 1: A docstring for this constraint, in Texinfo syntax; not currently |
| used, in future will be incorporated into the manual's list of |
| machine-specific operand constraints. |
| 2: A boolean expression which computes whether or not the constraint |
| matches. It should follow the same rules as a define_predicate |
| expression, including the bit about specifying the set of RTX codes |
| that could possibly match. MATCH_TEST subexpressions may make use of |
| these variables: |
| `op' - the RTL object defining the operand. |
| `mode' - the mode of `op'. |
| `ival' - INTVAL(op), if op is a CONST_INT. |
| `hval' - CONST_DOUBLE_HIGH(op), if op is an integer CONST_DOUBLE. |
| `lval' - CONST_DOUBLE_LOW(op), if op is an integer CONST_DOUBLE. |
| `rval' - CONST_DOUBLE_REAL_VALUE(op), if op is a floating-point |
| CONST_DOUBLE. |
| Do not use ival/hval/lval/rval if op is not the appropriate kind of |
| RTL object. */ |
| DEF_RTL_EXPR(DEFINE_CONSTRAINT, "define_constraint", "sse", RTX_EXTRA) |
| DEF_RTL_EXPR(DEFINE_MEMORY_CONSTRAINT, "define_memory_constraint", "sse", RTX_EXTRA) |
| DEF_RTL_EXPR(DEFINE_ADDRESS_CONSTRAINT, "define_address_constraint", "sse", RTX_EXTRA) |
| |
| |
| /* Constructions for CPU pipeline description described by NDFAs. */ |
| |
| /* (define_cpu_unit string [string]) describes cpu functional |
| units (separated by comma). |
| |
| 1st operand: Names of cpu functional units. |
| 2nd operand: Name of automaton (see comments for DEFINE_AUTOMATON). |
| |
| All define_reservations, define_cpu_units, and |
| define_query_cpu_units should have unique names which may not be |
| "nothing". */ |
| DEF_RTL_EXPR(DEFINE_CPU_UNIT, "define_cpu_unit", "sS", RTX_EXTRA) |
| |
| /* (define_query_cpu_unit string [string]) describes cpu functional |
| units analogously to define_cpu_unit. The reservation of such |
| units can be queried for automaton state. */ |
| DEF_RTL_EXPR(DEFINE_QUERY_CPU_UNIT, "define_query_cpu_unit", "sS", RTX_EXTRA) |
| |
| /* (exclusion_set string string) means that each CPU functional unit |
| in the first string can not be reserved simultaneously with any |
| unit whose name is in the second string and vise versa. CPU units |
| in the string are separated by commas. For example, it is useful |
| for description CPU with fully pipelined floating point functional |
| unit which can execute simultaneously only single floating point |
| insns or only double floating point insns. All CPU functional |
| units in a set should belong to the same automaton. */ |
| DEF_RTL_EXPR(EXCLUSION_SET, "exclusion_set", "ss", RTX_EXTRA) |
| |
| /* (presence_set string string) means that each CPU functional unit in |
| the first string can not be reserved unless at least one of pattern |
| of units whose names are in the second string is reserved. This is |
| an asymmetric relation. CPU units or unit patterns in the strings |
| are separated by commas. Pattern is one unit name or unit names |
| separated by white-spaces. |
| |
| For example, it is useful for description that slot1 is reserved |
| after slot0 reservation for a VLIW processor. We could describe it |
| by the following construction |
| |
| (presence_set "slot1" "slot0") |
| |
| Or slot1 is reserved only after slot0 and unit b0 reservation. In |
| this case we could write |
| |
| (presence_set "slot1" "slot0 b0") |
| |
| All CPU functional units in a set should belong to the same |
| automaton. */ |
| DEF_RTL_EXPR(PRESENCE_SET, "presence_set", "ss", RTX_EXTRA) |
| |
| /* (final_presence_set string string) is analogous to `presence_set'. |
| The difference between them is when checking is done. When an |
| instruction is issued in given automaton state reflecting all |
| current and planned unit reservations, the automaton state is |
| changed. The first state is a source state, the second one is a |
| result state. Checking for `presence_set' is done on the source |
| state reservation, checking for `final_presence_set' is done on the |
| result reservation. This construction is useful to describe a |
| reservation which is actually two subsequent reservations. For |
| example, if we use |
| |
| (presence_set "slot1" "slot0") |
| |
| the following insn will be never issued (because slot1 requires |
| slot0 which is absent in the source state). |
| |
| (define_reservation "insn_and_nop" "slot0 + slot1") |
| |
| but it can be issued if we use analogous `final_presence_set'. */ |
| DEF_RTL_EXPR(FINAL_PRESENCE_SET, "final_presence_set", "ss", RTX_EXTRA) |
| |
| /* (absence_set string string) means that each CPU functional unit in |
| the first string can be reserved only if each pattern of units |
| whose names are in the second string is not reserved. This is an |
| asymmetric relation (actually exclusion set is analogous to this |
| one but it is symmetric). CPU units or unit patterns in the string |
| are separated by commas. Pattern is one unit name or unit names |
| separated by white-spaces. |
| |
| For example, it is useful for description that slot0 can not be |
| reserved after slot1 or slot2 reservation for a VLIW processor. We |
| could describe it by the following construction |
| |
| (absence_set "slot2" "slot0, slot1") |
| |
| Or slot2 can not be reserved if slot0 and unit b0 are reserved or |
| slot1 and unit b1 are reserved . In this case we could write |
| |
| (absence_set "slot2" "slot0 b0, slot1 b1") |
| |
| All CPU functional units in a set should to belong the same |
| automaton. */ |
| DEF_RTL_EXPR(ABSENCE_SET, "absence_set", "ss", RTX_EXTRA) |
| |
| /* (final_absence_set string string) is analogous to `absence_set' but |
| checking is done on the result (state) reservation. See comments |
| for `final_presence_set'. */ |
| DEF_RTL_EXPR(FINAL_ABSENCE_SET, "final_absence_set", "ss", RTX_EXTRA) |
| |
| /* (define_bypass number out_insn_names in_insn_names) names bypass |
| with given latency (the first number) from insns given by the first |
| string (see define_insn_reservation) into insns given by the second |
| string. Insn names in the strings are separated by commas. The |
| third operand is optional name of function which is additional |
| guard for the bypass. The function will get the two insns as |
| parameters. If the function returns zero the bypass will be |
| ignored for this case. Additional guard is necessary to recognize |
| complicated bypasses, e.g. when consumer is load address. If there |
| are more one bypass with the same output and input insns, the |
| chosen bypass is the first bypass with a guard in description whose |
| guard function returns nonzero. If there is no such bypass, then |
| bypass without the guard function is chosen. */ |
| DEF_RTL_EXPR(DEFINE_BYPASS, "define_bypass", "issS", RTX_EXTRA) |
| |
| /* (define_automaton string) describes names of automata generated and |
| used for pipeline hazards recognition. The names are separated by |
| comma. Actually it is possibly to generate the single automaton |
| but unfortunately it can be very large. If we use more one |
| automata, the summary size of the automata usually is less than the |
| single one. The automaton name is used in define_cpu_unit and |
| define_query_cpu_unit. All automata should have unique names. */ |
| DEF_RTL_EXPR(DEFINE_AUTOMATON, "define_automaton", "s", RTX_EXTRA) |
| |
| /* (automata_option string) describes option for generation of |
| automata. Currently there are the following options: |
| |
| o "no-minimization" which makes no minimization of automata. This |
| is only worth to do when we are debugging the description and |
| need to look more accurately at reservations of states. |
| |
| o "time" which means printing additional time statistics about |
| generation of automata. |
| |
| o "v" which means generation of file describing the result |
| automata. The file has suffix `.dfa' and can be used for the |
| description verification and debugging. |
| |
| o "w" which means generation of warning instead of error for |
| non-critical errors. |
| |
| o "ndfa" which makes nondeterministic finite state automata. |
| |
| o "progress" which means output of a progress bar showing how many |
| states were generated so far for automaton being processed. */ |
| DEF_RTL_EXPR(AUTOMATA_OPTION, "automata_option", "s", RTX_EXTRA) |
| |
| /* (define_reservation string string) names reservation (the first |
| string) of cpu functional units (the 2nd string). Sometimes unit |
| reservations for different insns contain common parts. In such |
| case, you can describe common part and use its name (the 1st |
| parameter) in regular expression in define_insn_reservation. All |
| define_reservations, define_cpu_units, and define_query_cpu_units |
| should have unique names which may not be "nothing". */ |
| DEF_RTL_EXPR(DEFINE_RESERVATION, "define_reservation", "ss", RTX_EXTRA) |
| |
| /* (define_insn_reservation name default_latency condition regexpr) |
| describes reservation of cpu functional units (the 3nd operand) for |
| instruction which is selected by the condition (the 2nd parameter). |
| The first parameter is used for output of debugging information. |
| The reservations are described by a regular expression according |
| the following syntax: |
| |
| regexp = regexp "," oneof |
| | oneof |
| |
| oneof = oneof "|" allof |
| | allof |
| |
| allof = allof "+" repeat |
| | repeat |
| |
| repeat = element "*" number |
| | element |
| |
| element = cpu_function_unit_name |
| | reservation_name |
| | result_name |
| | "nothing" |
| | "(" regexp ")" |
| |
| 1. "," is used for describing start of the next cycle in |
| reservation. |
| |
| 2. "|" is used for describing the reservation described by the |
| first regular expression *or* the reservation described by the |
| second regular expression *or* etc. |
| |
| 3. "+" is used for describing the reservation described by the |
| first regular expression *and* the reservation described by the |
| second regular expression *and* etc. |
| |
| 4. "*" is used for convenience and simply means sequence in |
| which the regular expression are repeated NUMBER times with |
| cycle advancing (see ","). |
| |
| 5. cpu functional unit name which means its reservation. |
| |
| 6. reservation name -- see define_reservation. |
| |
| 7. string "nothing" means no units reservation. */ |
| |
| DEF_RTL_EXPR(DEFINE_INSN_RESERVATION, "define_insn_reservation", "sies", RTX_EXTRA) |
| |
| /* Expressions used for insn attributes. */ |
| |
| /* Definition of an insn attribute. |
| 1st operand: name of the attribute |
| 2nd operand: comma-separated list of possible attribute values |
| 3rd operand: expression for the default value of the attribute. */ |
| DEF_RTL_EXPR(DEFINE_ATTR, "define_attr", "sse", RTX_EXTRA) |
| |
| /* Definition of an insn attribute that uses an existing enumerated type. |
| 1st operand: name of the attribute |
| 2nd operand: the name of the enumerated type |
| 3rd operand: expression for the default value of the attribute. */ |
| DEF_RTL_EXPR(DEFINE_ENUM_ATTR, "define_enum_attr", "sse", RTX_EXTRA) |
| |
| /* Marker for the name of an attribute. */ |
| DEF_RTL_EXPR(ATTR, "attr", "s", RTX_EXTRA) |
| |
| /* For use in the last (optional) operand of DEFINE_INSN or DEFINE_PEEPHOLE and |
| in DEFINE_ASM_INSN to specify an attribute to assign to insns matching that |
| pattern. |
| |
| (set_attr "name" "value") is equivalent to |
| (set (attr "name") (const_string "value")) */ |
| DEF_RTL_EXPR(SET_ATTR, "set_attr", "ss", RTX_EXTRA) |
| |
| /* In the last operand of DEFINE_INSN and DEFINE_PEEPHOLE, this can be used to |
| specify that attribute values are to be assigned according to the |
| alternative matched. |
| |
| The following three expressions are equivalent: |
| |
| (set (attr "att") (cond [(eq_attrq "alternative" "1") (const_string "a1") |
| (eq_attrq "alternative" "2") (const_string "a2")] |
| (const_string "a3"))) |
| (set_attr_alternative "att" [(const_string "a1") (const_string "a2") |
| (const_string "a3")]) |
| (set_attr "att" "a1,a2,a3") |
| */ |
| DEF_RTL_EXPR(SET_ATTR_ALTERNATIVE, "set_attr_alternative", "sE", RTX_EXTRA) |
| |
| /* A conditional expression true if the value of the specified attribute of |
| the current insn equals the specified value. The first operand is the |
| attribute name and the second is the comparison value. */ |
| DEF_RTL_EXPR(EQ_ATTR, "eq_attr", "ss", RTX_EXTRA) |
| |
| /* A special case of the above representing a set of alternatives. The first |
| operand is bitmap of the set, the second one is the default value. */ |
| DEF_RTL_EXPR(EQ_ATTR_ALT, "eq_attr_alt", "ii", RTX_EXTRA) |
| |
| /* A conditional expression which is true if the specified flag is |
| true for the insn being scheduled in reorg. |
| |
| genattr.c defines the following flags which can be tested by |
| (attr_flag "foo") expressions in eligible_for_delay: forward, backward. */ |
| |
| DEF_RTL_EXPR (ATTR_FLAG, "attr_flag", "s", RTX_EXTRA) |
| |
| /* General conditional. The first operand is a vector composed of pairs of |
| expressions. The first element of each pair is evaluated, in turn. |
| The value of the conditional is the second expression of the first pair |
| whose first expression evaluates nonzero. If none of the expressions is |
| true, the second operand will be used as the value of the conditional. */ |
| DEF_RTL_EXPR(COND, "cond", "Ee", RTX_EXTRA) |
| |
| /* Definition of a pattern substitution meta operation on a DEFINE_EXPAND |
| or a DEFINE_INSN. Automatically generates new instances of DEFINE_INSNs |
| that match the substitution pattern. |
| |
| Operand: |
| 0: The name of the substitition template. |
| 1: Input template to match to see if a substitution is applicable. |
| 2: A C expression giving an additional condition for the generated |
| new define_expand or define_insn. |
| 3: Output tempalate to generate via substitution. |
| |
| Within a DEFINE_SUBST template, the meaning of some RTL expressions is |
| different from their usual interpretation: a MATCH_OPERAND matches any |
| expression tree with matching machine mode or with VOIDmode. Likewise, |
| MATCH_OP_DUP and MATCH_DUP match more liberally in a DEFINE_SUBST than |
| in other RTL expressions. MATCH_OPERATOR matches all common operators |
| but also UNSPEC, UNSPEC_VOLATILE, and MATCH_OPERATORS from the input |
| DEFINE_EXPAND or DEFINE_INSN. */ |
| DEF_RTL_EXPR(DEFINE_SUBST, "define_subst", "sEsE", RTX_EXTRA) |
| |
| /* Substitution attribute to apply a DEFINE_SUBST to a pattern. |
| |
| Operand: |
| 0: The name of the subst-attribute. |
| 1: The name of the DEFINE_SUBST to be applied for this attribute. |
| 2: String to substitute for the subst-attribute name in the pattern |
| name, for the case that the DEFINE_SUBST is not applied (i.e. the |
| unmodified version of the pattern). |
| 3: String to substitute for the subst-attribute name in the pattern |
| name, for the case that the DEFINE_SUBST is applied to the patten. |
| |
| The use of DEFINE_SUBST and DEFINE_SUBST_ATTR is explained in the |
| GCC internals manual, under "RTL Templates Transformations". */ |
| DEF_RTL_EXPR(DEFINE_SUBST_ATTR, "define_subst_attr", "ssss", RTX_EXTRA) |
| |
| #endif /* GENERATOR_FILE */ |
| |
| /* |
| Local variables: |
| mode:c |
| End: |
| */ |