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;; Constraint definitions for IA-32 and x86-64.

;; Copyright (C) 2006, 2007 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

;; .

;;; Unused letters:

;;;     B     H           TU W

;;;           h jk          vw  z

;; Integer register constraints.

;; It is not necessary to define 'r' here.

(define_register_constraint "R" "LEGACY_REGS"

 "Legacy register---the eight integer registers available on all

  i386 processors (@code{a}, @code{b}, @code{c}, @code{d},

  @code{si}, @code{di}, @code{bp}, @code{sp}).")

(define_register_constraint "q" "TARGET_64BIT ? GENERAL_REGS : Q_REGS"

 "Any register accessible as @code{@var{r}l}.  In 32-bit mode, @code{a},

  @code{b}, @code{c}, and @code{d}; in 64-bit mode, any integer register.")

(define_register_constraint "Q" "Q_REGS"

 "Any register accessible as @code{@var{r}h}: @code{a}, @code{b},

  @code{c}, and @code{d}.")

(define_register_constraint "l" "INDEX_REGS"

 "@internal Any register that can be used as the index in a base+index

  memory access: that is, any general register except the stack pointer.")

(define_register_constraint "a" "AREG"

 "The @code{a} register.")

(define_register_constraint "b" "BREG"

 "The @code{b} register.")

(define_register_constraint "c" "CREG"

 "The @code{c} register.")

(define_register_constraint "d" "DREG"

 "The @code{d} register.")

(define_register_constraint "S" "SIREG"

 "The @code{si} register.")

(define_register_constraint "D" "DIREG"

 "The @code{di} register.")

(define_register_constraint "A" "AD_REGS"

 "The @code{a} and @code{d} registers, as a pair (for instructions

  that return half the result in one and half in the other).")

;; Floating-point register constraints.

(define_register_constraint "f"

 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FLOAT_REGS : NO_REGS"

 "Any 80387 floating-point (stack) register.")

(define_register_constraint "t"

 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_TOP_REG : NO_REGS"

 "Top of 80387 floating-point stack (@code{%st(0)}).")

(define_register_constraint "u"

 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_SECOND_REG : NO_REGS"

 "Second from top of 80387 floating-point stack (@code{%st(1)}).")

;; Vector registers (also used for plain floating point nowadays).

(define_register_constraint "y" "TARGET_MMX ? MMX_REGS : NO_REGS"

 "Any MMX register.")

(define_register_constraint "x" "TARGET_SSE ? SSE_REGS : NO_REGS"

 "Any SSE register.")

(define_register_constraint "Y" "TARGET_SSE2? SSE_REGS : NO_REGS"

 "@internal Any SSE2 register.")

;; Integer constant constraints.

(define_constraint "I"

  "Integer constant in the range 0 @dots{} 31, for 32-bit shifts."

  (and (match_code "const_int")

       (match_test "ival >= 0 && ival <= 31")))

(define_constraint "J"

  "Integer constant in the range 0 @dots{} 63, for 64-bit shifts."

  (and (match_code "const_int")

       (match_test "ival >= 0 && ival <= 63")))

(define_constraint "K"

  "Signed 8-bit integer constant."

  (and (match_code "const_int")

       (match_test "ival >= -128 && ival <= 127")))

(define_constraint "L"

  "@code{0xFF} or @code{0xFFFF}, for andsi as a zero-extending move."

  (and (match_code "const_int")

       (match_test "ival == 0xFF || ival == 0xFFFF")))

(define_constraint "M"

  "0, 1, 2, or 3 (shifts for the @code{lea} instruction)."

  (and (match_code "const_int")

       (match_test "ival >= 0 && ival <= 3")))

(define_constraint "N"

  "Unsigned 8-bit integer constant (for @code{in} and @code{out}

   instructions)."

  (and (match_code "const_int")

       (match_test "ival >= 0 && ival <= 255")))

(define_constraint "O"

  "@internal Integer constant in the range 0 @dots{} 127, for 128-bit shifts."

  (and (match_code "const_int")

       (match_test "ival >= 0 && ival <= 127")))

;; Floating-point constant constraints.

;; We allow constants even if TARGET_80387 isn't set, because the

;; stack register converter may need to load 0.0 into the function

;; value register (top of stack).

(define_constraint "G"

  "Standard 80387 floating point constant."

  (and (match_code "const_double")

       (match_test "standard_80387_constant_p (op)")))

;; This can theoretically be any mode's CONST0_RTX.

(define_constraint "C"

  "Standard SSE floating point constant."

  (match_test "standard_sse_constant_p (op)"))

;; Constant-or-symbol-reference constraints.

(define_constraint "e"

  "32-bit signed integer constant, or a symbolic reference known

   to fit that range (for immediate operands in sign-extending x86-64

   instructions)."

  (match_operand 0 "x86_64_immediate_operand"))

(define_constraint "Z"

  "32-bit unsigned integer constant, or a symbolic reference known

   to fit that range (for immediate operands in zero-extending x86-64

   instructions)."

  (match_operand 0 "x86_64_zext_immediate_operand"))