2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVUTIL_X86_ASM_H
22 #define AVUTIL_X86_ASM_H
27 typedef struct xmm_reg { uint64_t a, b; } xmm_reg;
28 typedef struct ymm_reg { uint64_t a, b, c, d; } ymm_reg;
39 typedef int64_t x86_reg;
41 /* REG_SP is defined in Solaris sys headers, so use REG_sp */
61 typedef int32_t x86_reg;
75 #define HAVE_7REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE && HAVE_EBP_AVAILABLE))
76 #define HAVE_6REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE || HAVE_EBP_AVAILABLE))
78 #if ARCH_X86_64 && defined(PIC)
79 # define BROKEN_RELOCATIONS 1
83 * If gcc is not set to support sse (-msse) it will not accept xmm registers
84 * in the clobber list for inline asm. XMM_CLOBBERS takes a list of xmm
85 * registers to be marked as clobbered and evaluates to nothing if they are
86 * not supported, or to the list itself if they are supported. Since a clobber
87 * list may not be empty, XMM_CLOBBERS_ONLY should be used if the xmm
88 * registers are the only in the clobber list.
89 * For example a list with "eax" and "xmm0" as clobbers should become:
90 * : XMM_CLOBBERS("xmm0",) "eax"
91 * and a list with only "xmm0" should become:
92 * XMM_CLOBBERS_ONLY("xmm0")
95 # define XMM_CLOBBERS(...) __VA_ARGS__
96 # define XMM_CLOBBERS_ONLY(...) : __VA_ARGS__
98 # define XMM_CLOBBERS(...)
99 # define XMM_CLOBBERS_ONLY(...)
102 /* Use to export labels from asm. */
103 #define LABEL_MANGLE(a) EXTERN_PREFIX #a
105 // Use rip-relative addressing if compiling PIC code on x86-64.
106 #if ARCH_X86_64 && defined(PIC)
107 # define LOCAL_MANGLE(a) #a "(%%rip)"
109 # define LOCAL_MANGLE(a) #a
112 #if HAVE_INLINE_ASM_DIRECT_SYMBOL_REFS
113 # define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
114 # define NAMED_CONSTRAINTS_ADD(...)
115 # define NAMED_CONSTRAINTS(...)
116 # define NAMED_CONSTRAINTS_ARRAY_ADD(...)
117 # define NAMED_CONSTRAINTS_ARRAY(...)
119 /* When direct symbol references are used in code passed to a compiler that does not support them
120 * then these references need to be converted to named asm constraints instead.
121 * Instead of returning a direct symbol MANGLE now returns a named constraint for that specific symbol.
122 * In order for this to work there must also be a corresponding entry in the asm-interface. To add this
123 * entry use the macro NAMED_CONSTRAINTS() and pass in a list of each symbol reference used in the
124 * corresponding block of code. (e.g. NAMED_CONSTRAINTS(var1,var2,var3) where var1 is the first symbol etc. ).
125 * If there are already existing constraints then use NAMED_CONSTRAINTS_ADD to add to the existing constraint list.
127 # define MANGLE(a) "%["#a"]"
128 // Intel/MSVC does not correctly expand va-args so we need a rather ugly hack in order to get it to work
129 # define FE_0(P,X) P(X)
130 # define FE_1(P,X,X1) P(X), FE_0(P,X1)
131 # define FE_2(P,X,X1,X2) P(X), FE_1(P,X1,X2)
132 # define FE_3(P,X,X1,X2,X3) P(X), FE_2(P,X1,X2,X3)
133 # define FE_4(P,X,X1,X2,X3,X4) P(X), FE_3(P,X1,X2,X3,X4)
134 # define FE_5(P,X,X1,X2,X3,X4,X5) P(X), FE_4(P,X1,X2,X3,X4,X5)
135 # define FE_6(P,X,X1,X2,X3,X4,X5,X6) P(X), FE_5(P,X1,X2,X3,X4,X5,X6)
136 # define FE_7(P,X,X1,X2,X3,X4,X5,X6,X7) P(X), FE_6(P,X1,X2,X3,X4,X5,X6,X7)
137 # define FE_8(P,X,X1,X2,X3,X4,X5,X6,X7,X8) P(X), FE_7(P,X1,X2,X3,X4,X5,X6,X7,X8)
138 # define FE_9(P,X,X1,X2,X3,X4,X5,X6,X7,X8,X9) P(X), FE_8(P,X1,X2,X3,X4,X5,X6,X7,X8,X9)
139 # define GET_FE_IMPL(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,NAME,...) NAME
140 # define GET_FE(A) GET_FE_IMPL A
141 # define GET_FE_GLUE(x, y) x y
142 # define FOR_EACH_VA(P,...) GET_FE_GLUE(GET_FE((__VA_ARGS__,FE_9,FE_8,FE_7,FE_6,FE_5,FE_4,FE_3,FE_2,FE_1,FE_0)), (P,__VA_ARGS__))
143 # define NAME_CONSTRAINT(x) [x] "m"(x)
144 // Parameters are a list of each symbol reference required
145 # define NAMED_CONSTRAINTS_ADD(...) , FOR_EACH_VA(NAME_CONSTRAINT,__VA_ARGS__)
146 // Same but without comma for when there are no previously defined constraints
147 # define NAMED_CONSTRAINTS(...) FOR_EACH_VA(NAME_CONSTRAINT,__VA_ARGS__)
148 // Same as above NAMED_CONSTRAINTS except used for passing arrays/pointers instead of normal variables
149 # define NAME_CONSTRAINT_ARRAY(x) [x] "m"(*x)
150 # define NAMED_CONSTRAINTS_ARRAY_ADD(...) , FOR_EACH_VA(NAME_CONSTRAINT_ARRAY,__VA_ARGS__)
151 # define NAMED_CONSTRAINTS_ARRAY(...) FOR_EACH_VA(NAME_CONSTRAINT_ARRAY,__VA_ARGS__)
154 #endif /* AVUTIL_X86_ASM_H */