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comparison gcc/config/i386/constraints.md @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 ;; Constraint definitions for IA-32 and x86-64.
2 ;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
3 ;;
4 ;; This file is part of GCC.
5 ;;
6 ;; GCC is free software; you can redistribute it and/or modify
7 ;; it under the terms of the GNU General Public License as published by
8 ;; the Free Software Foundation; either version 3, or (at your option)
9 ;; any later version.
10 ;;
11 ;; GCC is distributed in the hope that it will be useful,
12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;; GNU General Public License for more details.
15 ;;
16 ;; You should have received a copy of the GNU General Public License
17 ;; along with GCC; see the file COPYING3. If not see
18 ;; <http://www.gnu.org/licenses/>.
19
20 ;;; Unused letters:
21 ;;; B H TU W
22 ;;; h jk vw z
23
24 ;; Integer register constraints.
25 ;; It is not necessary to define 'r' here.
26 (define_register_constraint "R" "LEGACY_REGS"
27 "Legacy register---the eight integer registers available on all
28 i386 processors (@code{a}, @code{b}, @code{c}, @code{d},
29 @code{si}, @code{di}, @code{bp}, @code{sp}).")
30
31 (define_register_constraint "q" "TARGET_64BIT ? GENERAL_REGS : Q_REGS"
32 "Any register accessible as @code{@var{r}l}. In 32-bit mode, @code{a},
33 @code{b}, @code{c}, and @code{d}; in 64-bit mode, any integer register.")
34
35 (define_register_constraint "Q" "Q_REGS"
36 "Any register accessible as @code{@var{r}h}: @code{a}, @code{b},
37 @code{c}, and @code{d}.")
38
39 (define_register_constraint "l" "INDEX_REGS"
40 "@internal Any register that can be used as the index in a base+index
41 memory access: that is, any general register except the stack pointer.")
42
43 (define_register_constraint "a" "AREG"
44 "The @code{a} register.")
45
46 (define_register_constraint "b" "BREG"
47 "The @code{b} register.")
48
49 (define_register_constraint "c" "CREG"
50 "The @code{c} register.")
51
52 (define_register_constraint "d" "DREG"
53 "The @code{d} register.")
54
55 (define_register_constraint "S" "SIREG"
56 "The @code{si} register.")
57
58 (define_register_constraint "D" "DIREG"
59 "The @code{di} register.")
60
61 (define_register_constraint "A" "AD_REGS"
62 "The @code{a} and @code{d} registers, as a pair (for instructions
63 that return half the result in one and half in the other).")
64
65 ;; Floating-point register constraints.
66 (define_register_constraint "f"
67 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FLOAT_REGS : NO_REGS"
68 "Any 80387 floating-point (stack) register.")
69
70 (define_register_constraint "t"
71 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_TOP_REG : NO_REGS"
72 "Top of 80387 floating-point stack (@code{%st(0)}).")
73
74 (define_register_constraint "u"
75 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_SECOND_REG : NO_REGS"
76 "Second from top of 80387 floating-point stack (@code{%st(1)}).")
77
78 ;; Vector registers (also used for plain floating point nowadays).
79 (define_register_constraint "y" "TARGET_MMX ? MMX_REGS : NO_REGS"
80 "Any MMX register.")
81
82 (define_register_constraint "x" "TARGET_SSE ? SSE_REGS : NO_REGS"
83 "Any SSE register.")
84
85 ;; We use the Y prefix to denote any number of conditional register sets:
86 ;; z First SSE register.
87 ;; 2 SSE2 enabled
88 ;; i SSE2 inter-unit moves enabled
89 ;; m MMX inter-unit moves enabled
90
91 (define_register_constraint "Yz" "TARGET_SSE ? SSE_FIRST_REG : NO_REGS"
92 "First SSE register (@code{%xmm0}).")
93
94 (define_register_constraint "Y2" "TARGET_SSE2 ? SSE_REGS : NO_REGS"
95 "@internal Any SSE register, when SSE2 is enabled.")
96
97 (define_register_constraint "Yi"
98 "TARGET_SSE2 && TARGET_INTER_UNIT_MOVES ? SSE_REGS : NO_REGS"
99 "@internal Any SSE register, when SSE2 and inter-unit moves are enabled.")
100
101 (define_register_constraint "Ym"
102 "TARGET_MMX && TARGET_INTER_UNIT_MOVES ? MMX_REGS : NO_REGS"
103 "@internal Any MMX register, when inter-unit moves are enabled.")
104
105 ;; Integer constant constraints.
106 (define_constraint "I"
107 "Integer constant in the range 0 @dots{} 31, for 32-bit shifts."
108 (and (match_code "const_int")
109 (match_test "IN_RANGE (ival, 0, 31)")))
110
111 (define_constraint "J"
112 "Integer constant in the range 0 @dots{} 63, for 64-bit shifts."
113 (and (match_code "const_int")
114 (match_test "IN_RANGE (ival, 0, 63)")))
115
116 (define_constraint "K"
117 "Signed 8-bit integer constant."
118 (and (match_code "const_int")
119 (match_test "IN_RANGE (ival, -128, 127)")))
120
121 (define_constraint "L"
122 "@code{0xFF} or @code{0xFFFF}, for andsi as a zero-extending move."
123 (and (match_code "const_int")
124 (match_test "ival == 0xFF || ival == 0xFFFF")))
125
126 (define_constraint "M"
127 "0, 1, 2, or 3 (shifts for the @code{lea} instruction)."
128 (and (match_code "const_int")
129 (match_test "IN_RANGE (ival, 0, 3)")))
130
131 (define_constraint "N"
132 "Unsigned 8-bit integer constant (for @code{in} and @code{out}
133 instructions)."
134 (and (match_code "const_int")
135 (match_test "IN_RANGE (ival, 0, 255)")))
136
137 (define_constraint "O"
138 "@internal Integer constant in the range 0 @dots{} 127, for 128-bit shifts."
139 (and (match_code "const_int")
140 (match_test "IN_RANGE (ival, 0, 127)")))
141
142 ;; Floating-point constant constraints.
143 ;; We allow constants even if TARGET_80387 isn't set, because the
144 ;; stack register converter may need to load 0.0 into the function
145 ;; value register (top of stack).
146 (define_constraint "G"
147 "Standard 80387 floating point constant."
148 (and (match_code "const_double")
149 (match_test "standard_80387_constant_p (op)")))
150
151 ;; This can theoretically be any mode's CONST0_RTX.
152 (define_constraint "C"
153 "Standard SSE floating point constant."
154 (match_test "standard_sse_constant_p (op)"))
155
156 ;; Constant-or-symbol-reference constraints.
157
158 (define_constraint "e"
159 "32-bit signed integer constant, or a symbolic reference known
160 to fit that range (for immediate operands in sign-extending x86-64
161 instructions)."
162 (match_operand 0 "x86_64_immediate_operand"))
163
164 (define_constraint "Z"
165 "32-bit unsigned integer constant, or a symbolic reference known
166 to fit that range (for immediate operands in zero-extending x86-64
167 instructions)."
168 (match_operand 0 "x86_64_zext_immediate_operand"))