constraints.md revision 169689
1190688Sweongyo;; Constraint definitions for IA-32 and x86-64. 2190688Sweongyo;; Copyright (C) 2006 Free Software Foundation, Inc. 3190688Sweongyo;; 4190688Sweongyo;; This file is part of GCC. 5190688Sweongyo;; 6190688Sweongyo;; GCC is free software; you can redistribute it and/or modify 7190688Sweongyo;; it under the terms of the GNU General Public License as published by 8190688Sweongyo;; the Free Software Foundation; either version 2, or (at your option) 9190688Sweongyo;; any later version. 10190688Sweongyo;; 11190688Sweongyo;; GCC is distributed in the hope that it will be useful, 12190688Sweongyo;; but WITHOUT ANY WARRANTY; without even the implied warranty of 13190688Sweongyo;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14190688Sweongyo;; GNU General Public License for more details. 15190688Sweongyo;; 16190688Sweongyo;; You should have received a copy of the GNU General Public License 17190688Sweongyo;; along with GCC; see the file COPYING. If not, write to 18190688Sweongyo;; the Free Software Foundation, 51 Franklin Street, Fifth Floor, 19190688Sweongyo;; Boston, MA 02110-1301, USA. 20190688Sweongyo 21190688Sweongyo;;; Unused letters: 22190688Sweongyo;;; B H TU W 23190688Sweongyo;;; h jk vw z 24190688Sweongyo 25190688Sweongyo;; Integer register constraints. 26190688Sweongyo;; It is not necessary to define 'r' here. 27190688Sweongyo(define_register_constraint "R" "LEGACY_REGS" 28190688Sweongyo "Legacy register---the eight integer registers available on all 29190688Sweongyo i386 processors (@code{a}, @code{b}, @code{c}, @code{d}, 30190688Sweongyo @code{si}, @code{di}, @code{bp}, @code{sp}).") 31190688Sweongyo 32190688Sweongyo(define_register_constraint "q" "TARGET_64BIT ? GENERAL_REGS : Q_REGS" 33190688Sweongyo "Any register accessible as @code{@var{r}l}. In 32-bit mode, @code{a}, 34190688Sweongyo @code{b}, @code{c}, and @code{d}; in 64-bit mode, any integer register.") 35190688Sweongyo 36190688Sweongyo(define_register_constraint "Q" "Q_REGS" 37190688Sweongyo "Any register accessible as @code{@var{r}h}: @code{a}, @code{b}, 38190688Sweongyo @code{c}, and @code{d}.") 39190688Sweongyo 40190688Sweongyo(define_register_constraint "l" "INDEX_REGS" 41190688Sweongyo "@internal Any register that can be used as the index in a base+index 42190688Sweongyo memory access: that is, any general register except the stack pointer.") 43190688Sweongyo 44190688Sweongyo(define_register_constraint "a" "AREG" 45190688Sweongyo "The @code{a} register.") 46190688Sweongyo 47190688Sweongyo(define_register_constraint "b" "BREG" 48190688Sweongyo "The @code{b} register.") 49190688Sweongyo 50190688Sweongyo(define_register_constraint "c" "CREG" 51190688Sweongyo "The @code{c} register.") 52190688Sweongyo 53190688Sweongyo(define_register_constraint "d" "DREG" 54190688Sweongyo "The @code{d} register.") 55190688Sweongyo 56190688Sweongyo(define_register_constraint "S" "SIREG" 57190688Sweongyo "The @code{si} register.") 58190688Sweongyo 59190688Sweongyo(define_register_constraint "D" "DIREG" 60190688Sweongyo "The @code{di} register.") 61190688Sweongyo 62190688Sweongyo(define_register_constraint "A" "AD_REGS" 63190688Sweongyo "The @code{a} and @code{d} registers, as a pair (for instructions 64190688Sweongyo that return half the result in one and half in the other).") 65190688Sweongyo 66190688Sweongyo;; Floating-point register constraints. 67190688Sweongyo(define_register_constraint "f" 68190688Sweongyo "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FLOAT_REGS : NO_REGS" 69190688Sweongyo "Any 80387 floating-point (stack) register.") 70190688Sweongyo 71190688Sweongyo(define_register_constraint "t" 72190688Sweongyo "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_TOP_REG : NO_REGS" 73190688Sweongyo "Top of 80387 floating-point stack (@code{%st(0)}).") 74190688Sweongyo 75190688Sweongyo(define_register_constraint "u" 76190688Sweongyo "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_SECOND_REG : NO_REGS" 77190688Sweongyo "Second from top of 80387 floating-point stack (@code{%st(1)}).") 78190688Sweongyo 79190688Sweongyo;; Vector registers (also used for plain floating point nowadays). 80190688Sweongyo(define_register_constraint "y" "TARGET_MMX ? MMX_REGS : NO_REGS" 81190688Sweongyo "Any MMX register.") 82190688Sweongyo 83190688Sweongyo(define_register_constraint "x" "TARGET_SSE ? SSE_REGS : NO_REGS" 84190688Sweongyo "Any SSE register.") 85190688Sweongyo 86190688Sweongyo(define_register_constraint "Y" "TARGET_SSE2? SSE_REGS : NO_REGS" 87190688Sweongyo "@internal Any SSE2 register.") 88190688Sweongyo 89190688Sweongyo;; Integer constant constraints. 90190688Sweongyo(define_constraint "I" 91190688Sweongyo "Integer constant in the range 0 @dots{} 31, for 32-bit shifts." 92190688Sweongyo (and (match_code "const_int") 93190688Sweongyo (match_test "ival >= 0 && ival <= 31"))) 94190688Sweongyo 95190688Sweongyo(define_constraint "J" 96190688Sweongyo "Integer constant in the range 0 @dots{} 63, for 64-bit shifts." 97190688Sweongyo (and (match_code "const_int") 98190688Sweongyo (match_test "ival >= 0 && ival <= 63"))) 99190688Sweongyo 100190688Sweongyo(define_constraint "K" 101190688Sweongyo "Signed 8-bit integer constant." 102190688Sweongyo (and (match_code "const_int") 103190688Sweongyo (match_test "ival >= -128 && ival <= 127"))) 104190688Sweongyo 105190688Sweongyo(define_constraint "L" 106190688Sweongyo "@code{0xFF} or @code{0xFFFF}, for andsi as a zero-extending move." 107190688Sweongyo (and (match_code "const_int") 108190688Sweongyo (match_test "ival == 0xFF || ival == 0xFFFF"))) 109190688Sweongyo 110190688Sweongyo(define_constraint "M" 111190688Sweongyo "0, 1, 2, or 3 (shifts for the @code{lea} instruction)." 112190688Sweongyo (and (match_code "const_int") 113190688Sweongyo (match_test "ival >= 0 && ival <= 3"))) 114190688Sweongyo 115190688Sweongyo(define_constraint "N" 116190688Sweongyo "Unsigned 8-bit integer constant (for @code{in} and @code{out} 117190688Sweongyo instructions)." 118190688Sweongyo (and (match_code "const_int") 119190688Sweongyo (match_test "ival >= 0 && ival <= 255"))) 120190688Sweongyo 121190688Sweongyo(define_constraint "O" 122190688Sweongyo "@internal Integer constant in the range 0 @dots{} 127, for 128-bit shifts." 123190688Sweongyo (and (match_code "const_int") 124190688Sweongyo (match_test "ival >= 0 && ival <= 127"))) 125190688Sweongyo 126190688Sweongyo;; Floating-point constant constraints. 127190688Sweongyo;; We allow constants even if TARGET_80387 isn't set, because the 128190688Sweongyo;; stack register converter may need to load 0.0 into the function 129190688Sweongyo;; value register (top of stack). 130190688Sweongyo(define_constraint "G" 131190688Sweongyo "Standard 80387 floating point constant." 132190688Sweongyo (and (match_code "const_double") 133190688Sweongyo (match_test "standard_80387_constant_p (op)"))) 134190688Sweongyo 135190688Sweongyo;; This can theoretically be any mode's CONST0_RTX. 136190688Sweongyo(define_constraint "C" 137190688Sweongyo "Standard SSE floating point constant." 138190688Sweongyo (match_test "standard_sse_constant_p (op)")) 139190688Sweongyo 140190688Sweongyo;; Constant-or-symbol-reference constraints. 141190688Sweongyo 142190688Sweongyo(define_constraint "e" 143190688Sweongyo "32-bit signed integer constant, or a symbolic reference known 144190688Sweongyo to fit that range (for immediate operands in sign-extending x86-64 145190688Sweongyo instructions)." 146190688Sweongyo (match_operand 0 "x86_64_immediate_operand")) 147190688Sweongyo 148190688Sweongyo(define_constraint "Z" 149190688Sweongyo "32-bit unsigned integer constant, or a symbolic reference known 150190688Sweongyo to fit that range (for immediate operands in zero-extending x86-64 151190688Sweongyo instructions)." 152190688Sweongyo (match_operand 0 "x86_64_zext_immediate_operand")) 153190688Sweongyo