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/* 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, 1988, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2004,

   2005

   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 2, 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 COPYING.  If not, write to the Free

Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.  */

/* 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)

     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)

/* ---------------------------------------------------------------------

   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)

/* SEQUENCE appears in the result of a `gen_...' function

   for a DEFINE_EXPAND that wants to make several insns.

   Its elements are the bodies of the insns that should be made.

   `emit_insn' takes the SEQUENCE apart and makes separate insns.  */

DEF_RTL_EXPR(SEQUENCE, "sequence", "E", RTX_EXTRA)

/* Refers to the address of its argument.  This is only used in alias.c.  */

DEF_RTL_EXPR(ADDRESS, "address", "e", RTX_MATCH)

/* ----------------------------------------------------------------------

   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 instruction that cannot jump.  */

DEF_RTL_EXPR(INSN, "insn", "iuuBieiee", 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", "iuuBieiee0", 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[9] ) 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", "iuuBieieee", RTX_INSN)

/* A marker that indicates that control will not flow through.  */

DEF_RTL_EXPR(BARRIER, "barrier", "iuu000000", RTX_EXTRA)

/* Holds a label that is followed by instructions.

   Operand:

   4: is used in jump.c for the use-count of the label.

   5: is used in flow.c to point to the chain of label_ref's to this label.

   6: is a number that is unique in the entire compilation.

   7: is the user-given name of the label, if any.  */

DEF_RTL_EXPR(CODE_LABEL, "code_label", "iuuB00is", RTX_EXTRA)

#ifdef USE_MAPPED_LOCATION

/* Say where in the code a source line starts, for symbol table's sake.

   Operand:

   4: unused if line number > 0, note-specific data otherwise.

   5: line number if > 0, enum note_insn otherwise.

   6: CODE_LABEL_NUMBER if line number == NOTE_INSN_DELETED_LABEL.  */

#else

/* Say where in the code a source line starts, for symbol table's sake.

   Operand:

   4: filename, if line number > 0, note-specific data otherwise.

   5: line number if > 0, enum note_insn otherwise.

   6: unique number if line number == note_insn_deleted_label.  */

#endif

DEF_RTL_EXPR(NOTE, "note", "iuuB0ni", 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", "s", RTX_EXTRA)

#ifdef USE_MAPPED_LOCATION

/* 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 the source line number.  */

DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEi", RTX_EXTRA)

#else

/* 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 the name of the containing source file.

   7th is the source line number.  */

DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEsi", RTX_EXTRA)

#endif

/* 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.)

   This can occur all by itself in a PATTERN, as a component of a PARALLEL,

   or inside an expression.  */

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)

/* 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

   compilations.  */

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.  */

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).  */

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)

/* 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)

/* Placeholder for _Unwind_Resume before we know if a function call

   or a branch is needed.  Operand 1 is the exception region from

   which control is flowing.  */

DEF_RTL_EXPR(RESX, "resx", "i", RTX_EXTRA)

/* ----------------------------------------------------------------------

   Primitive values for use in expressions.

   ---------------------------------------------------------------------- */

/* numeric integer constant */

DEF_RTL_EXPR(CONST_INT, "const_int", "w", RTX_CONST_OBJ)

/* numeric floating point constant.

   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)

/* 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_struct.  */

DEF_RTL_EXPR(VALUE, "value", "0", 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

   holds the original register number - this will be different for a

   pseudo register that got turned into a hard register.  The third

   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", "i00", RTX_OBJ)

/* A scratch register.  This represents a register used only within a

   single insn.  It will be turned into 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.  This code is

   marked as having one operand so it can be turned into a REG.  */

DEF_RTL_EXPR(SCRATCH, "scratch", "0", RTX_OBJ)

/* One word of a multi-word value.

   The first operand is the complete value; the second says which word.

   The WORDS_BIG_ENDIAN flag controls whether word number 0

   (as numbered in a SUBREG) is the most or least significant word.

   This is also used to refer to a value in a different machine mode.

   For example, it can be used to refer to a SImode value as if it were

   Qimode, or vice versa.  Then the word number is always 0.  */

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)

/* 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.

   The unprinted field 1 is used in flow.c for the LABEL_NEXTREF.  */

DEF_RTL_EXPR(LABEL_REF, "label_ref", "u0", RTX_CONST_OBJ)

/* Reference to a named label:

   Operand 0: label name

   Operand 1: flags (see SYMBOL_FLAG_* in rtl.h)

   Operand 2: 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", "s00", 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)

/* Operand 0 divided by operand 1.  */

DEF_RTL_EXPR(DIV, "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 life_analysis pass in flow.c.  */

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)

/* Absolute value */

DEF_RTL_EXPR(ABS, "abs", "e", RTX_UNARY)

/* Square root */

DEF_RTL_EXPR(SQRT, "sqrt", "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 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)

/* 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)

/* Information about the variable and its location.  */

DEF_RTL_EXPR(VAR_LOCATION, "var_location", "te", RTX_EXTRA)

/* All expressions from this point forward appear only in machine

   descriptions.  */

#ifdef GENERATOR_FILE

/* Include a secondary machine-description file at this point.  */

DEF_RTL_EXPR(INCLUDE, "include", "s", RTX_EXTRA)

/* 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).  */

DEF_RTL_EXPR(MATCH_CODE, "match_code", "s", RTX_MATCH)

/* Appears only in define_predicate/define_special_predicate

    expressions.  The argument is a C expression to be injected at this

    point in the predicate formula.  */

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').  */

DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEss", 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.  */

DEF_RTL_EXPR(DEFINE_COND_EXEC, "define_cond_exec", "Ess", 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)

/* 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")