5.4 KiB
;; Constraint definitions for IA-32 and x86-64. ;; Copyright (C) 2006 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.
;;; 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"))