constraints.md revision 169690
138494Sobrien;; Constraint definitions for IA-32 and x86-64. 2174294Sobrien;; Copyright (C) 2006 Free Software Foundation, Inc. 338494Sobrien;; 438494Sobrien;; This file is part of GCC. 538494Sobrien;; 638494Sobrien;; GCC is free software; you can redistribute it and/or modify 738494Sobrien;; it under the terms of the GNU General Public License as published by 838494Sobrien;; the Free Software Foundation; either version 2, or (at your option) 938494Sobrien;; any later version. 1038494Sobrien;; 1138494Sobrien;; GCC is distributed in the hope that it will be useful, 1238494Sobrien;; but WITHOUT ANY WARRANTY; without even the implied warranty of 1338494Sobrien;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1438494Sobrien;; GNU General Public License for more details. 1538494Sobrien;; 1638494Sobrien;; You should have received a copy of the GNU General Public License 1738494Sobrien;; along with GCC; see the file COPYING. If not, write to 1838494Sobrien;; the Free Software Foundation, 51 Franklin Street, Fifth Floor, 1938494Sobrien;; Boston, MA 02110-1301, USA. 2042629Sobrien 2138494Sobrien;;; Unused letters: 2238494Sobrien;;; B H TU W 2338494Sobrien;;; h jk vw z 2438494Sobrien 2538494Sobrien;; Integer register constraints. 2638494Sobrien;; It is not necessary to define 'r' here. 2738494Sobrien(define_register_constraint "R" "LEGACY_REGS" 2838494Sobrien "Legacy register---the eight integer registers available on all 2938494Sobrien i386 processors (@code{a}, @code{b}, @code{c}, @code{d}, 3038494Sobrien @code{si}, @code{di}, @code{bp}, @code{sp}).") 3138494Sobrien 3238494Sobrien(define_register_constraint "q" "TARGET_64BIT ? GENERAL_REGS : Q_REGS" 3338494Sobrien "Any register accessible as @code{@var{r}l}. In 32-bit mode, @code{a}, 3438494Sobrien @code{b}, @code{c}, and @code{d}; in 64-bit mode, any integer register.") 3538494Sobrien 3638494Sobrien(define_register_constraint "Q" "Q_REGS" 3738494Sobrien "Any register accessible as @code{@var{r}h}: @code{a}, @code{b}, 3838494Sobrien @code{c}, and @code{d}.") 3938494Sobrien 40174294Sobrien(define_register_constraint "l" "INDEX_REGS" 4138494Sobrien "@internal Any register that can be used as the index in a base+index 4238494Sobrien memory access: that is, any general register except the stack pointer.") 4338494Sobrien 4438494Sobrien(define_register_constraint "a" "AREG" 4538494Sobrien "The @code{a} register.") 4638494Sobrien 4738494Sobrien(define_register_constraint "b" "BREG" 4838494Sobrien "The @code{b} register.") 4938494Sobrien 5038494Sobrien(define_register_constraint "c" "CREG" 5138494Sobrien "The @code{c} register.") 5238494Sobrien 5338494Sobrien(define_register_constraint "d" "DREG" 5438494Sobrien "The @code{d} register.") 5538494Sobrien 5638494Sobrien(define_register_constraint "S" "SIREG" 5738494Sobrien "The @code{si} register.") 5838494Sobrien 5938494Sobrien(define_register_constraint "D" "DIREG" 6038494Sobrien "The @code{di} register.") 6138494Sobrien 6238494Sobrien(define_register_constraint "A" "AD_REGS" 6338494Sobrien "The @code{a} and @code{d} registers, as a pair (for instructions 6438494Sobrien that return half the result in one and half in the other).") 65174294Sobrien 6638494Sobrien;; Floating-point register constraints. 6738494Sobrien(define_register_constraint "f" 6838494Sobrien "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FLOAT_REGS : NO_REGS" 69174294Sobrien "Any 80387 floating-point (stack) register.") 70174294Sobrien 7138494Sobrien(define_register_constraint "t" 7238494Sobrien "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_TOP_REG : NO_REGS" 73174294Sobrien "Top of 80387 floating-point stack (@code{%st(0)}).") 74174294Sobrien 75174294Sobrien(define_register_constraint "u" 76174294Sobrien "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_SECOND_REG : NO_REGS" 77174294Sobrien "Second from top of 80387 floating-point stack (@code{%st(1)}).") 78174294Sobrien 79174294Sobrien;; Vector registers (also used for plain floating point nowadays). 80174294Sobrien(define_register_constraint "y" "TARGET_MMX ? MMX_REGS : NO_REGS" 8138494Sobrien "Any MMX register.") 8238494Sobrien 8338494Sobrien(define_register_constraint "x" "TARGET_SSE ? SSE_REGS : NO_REGS" 8438494Sobrien "Any SSE register.") 8538494Sobrien 8638494Sobrien(define_register_constraint "Y" "TARGET_SSE2? SSE_REGS : NO_REGS" 8738494Sobrien "@internal Any SSE2 register.") 8838494Sobrien 8938494Sobrien;; Integer constant constraints. 9038494Sobrien(define_constraint "I" 9138494Sobrien "Integer constant in the range 0 @dots{} 31, for 32-bit shifts." 9238494Sobrien (and (match_code "const_int") 9338494Sobrien (match_test "ival >= 0 && ival <= 31"))) 9438494Sobrien 9538494Sobrien(define_constraint "J" 9638494Sobrien "Integer constant in the range 0 @dots{} 63, for 64-bit shifts." 97174294Sobrien (and (match_code "const_int") 98174294Sobrien (match_test "ival >= 0 && ival <= 63"))) 99174294Sobrien 100174294Sobrien(define_constraint "K" 10138494Sobrien "Signed 8-bit integer constant." 10238494Sobrien (and (match_code "const_int") 10338494Sobrien (match_test "ival >= -128 && ival <= 127"))) 10438494Sobrien 10538494Sobrien(define_constraint "L" 10638494Sobrien "@code{0xFF} or @code{0xFFFF}, for andsi as a zero-extending move." 10738494Sobrien (and (match_code "const_int") 10838494Sobrien (match_test "ival == 0xFF || ival == 0xFFFF"))) 10938494Sobrien 11038494Sobrien(define_constraint "M" 111 "0, 1, 2, or 3 (shifts for the @code{lea} instruction)." 112 (and (match_code "const_int") 113 (match_test "ival >= 0 && ival <= 3"))) 114 115(define_constraint "N" 116 "Unsigned 8-bit integer constant (for @code{in} and @code{out} 117 instructions)." 118 (and (match_code "const_int") 119 (match_test "ival >= 0 && ival <= 255"))) 120 121(define_constraint "O" 122 "@internal Integer constant in the range 0 @dots{} 127, for 128-bit shifts." 123 (and (match_code "const_int") 124 (match_test "ival >= 0 && ival <= 127"))) 125 126;; Floating-point constant constraints. 127;; We allow constants even if TARGET_80387 isn't set, because the 128;; stack register converter may need to load 0.0 into the function 129;; value register (top of stack). 130(define_constraint "G" 131 "Standard 80387 floating point constant." 132 (and (match_code "const_double") 133 (match_test "standard_80387_constant_p (op)"))) 134 135;; This can theoretically be any mode's CONST0_RTX. 136(define_constraint "C" 137 "Standard SSE floating point constant." 138 (match_test "standard_sse_constant_p (op)")) 139 140;; Constant-or-symbol-reference constraints. 141 142(define_constraint "e" 143 "32-bit signed integer constant, or a symbolic reference known 144 to fit that range (for immediate operands in sign-extending x86-64 145 instructions)." 146 (match_operand 0 "x86_64_immediate_operand")) 147 148(define_constraint "Z" 149 "32-bit unsigned integer constant, or a symbolic reference known 150 to fit that range (for immediate operands in zero-extending x86-64 151 instructions)." 152 (match_operand 0 "x86_64_zext_immediate_operand")) 153