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x86: check for AVX support 

This adds configure and runtime checks for AVX support on x86 CPUs.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-02-16 02:39:42 +00:00
parent 74d6871d62
commit 87f1355f9b
4 changed files with 19 additions and 1 deletions
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4
configure vendored
View File

@ -222,6 +222,7 @@ Advanced options (experts only):
--disable-mmx2 disable MMX2 optimizations
--disable-sse disable SSE optimizations
--disable-ssse3 disable SSSE3 optimizations
--disable-avx disable AVX optimizations
--disable-armv5te disable armv5te optimizations
--disable-armv6 disable armv6 optimizations
--disable-armv6t2 disable armv6t2 optimizations
@ -975,6 +976,7 @@ ARCH_EXT_LIST='
armv6
armv6t2
armvfp
avx
iwmmxt
mmi
mmx
@ -1183,6 +1185,7 @@ mmx_deps="x86"
mmx2_deps="mmx"
sse_deps="mmx"
ssse3_deps="sse"
avx_deps="ssse3"
aligned_stack_if_any="ppc x86"
fast_64bit_if_any="alpha ia64 mips64 parisc64 ppc64 sparc64 x86_64"
@ -2676,6 +2679,7 @@ EOF
check_yasm "pextrd [eax], xmm0, 1" && enable yasm ||
die "yasm not found, use --disable-yasm for a crippled build"
check_yasm "vpaddw xmm0, xmm0, xmm0" || disable avx
fi
case "$cpu" in

3
libavutil/cpu.c
View File

@ -44,7 +44,7 @@ int main(void)
int cpu_flags = av_get_cpu_flags();
printf("cpu_flags = 0x%08X\n", cpu_flags);
printf("cpu_flags = %s%s%s%s%s%s%s%s%s%s%s%s\n",
printf("cpu_flags = %s%s%s%s%s%s%s%s%s%s%s%s%s\n",
#if ARCH_ARM
cpu_flags & AV_CPU_FLAG_IWMMXT ? "IWMMXT " : "",
#elif ARCH_PPC
@ -60,6 +60,7 @@ int main(void)
cpu_flags & AV_CPU_FLAG_SSSE3 ? "SSSE3 " : "",
cpu_flags & AV_CPU_FLAG_SSE4 ? "SSE4.1 " : "",
cpu_flags & AV_CPU_FLAG_SSE42 ? "SSE4.2 " : "",
cpu_flags & AV_CPU_FLAG_AVX ? "AVX " : "",
cpu_flags & AV_CPU_FLAG_3DNOW ? "3DNow " : "",
cpu_flags & AV_CPU_FLAG_3DNOWEXT ? "3DNowExt " : "");
#endif

1
libavutil/cpu.h
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@ -36,6 +36,7 @@
#define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
#define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
#define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
#define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
#define AV_CPU_FLAG_IWMMXT 0x0100 ///< XScale IWMMXT
#define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard

12
libavutil/x86/cpu.c
View File

@ -35,6 +35,9 @@
"=c" (ecx), "=d" (edx)\
: "0" (index));
#define xgetbv(index,eax,edx) \
__asm__ ("xgetbv" : "=a"(eax), "=d"(edx) : "c" (index))
/* Function to test if multimedia instructions are supported... */
int ff_get_cpu_flags_x86(void)
{
@ -93,6 +96,15 @@ int ff_get_cpu_flags_x86(void)
rval |= AV_CPU_FLAG_SSE4;
if (ecx & 0x00100000 )
rval |= AV_CPU_FLAG_SSE42;
#if HAVE_AVX
/* Check OXSAVE and AVX bits */
if ((ecx & 0x18000000) == 0x18000000) {
/* Check for OS support */
xgetbv(0, eax, edx);
if ((eax & 0x6) == 0x6)
rval |= AV_CPU_FLAG_AVX;
}
#endif
#endif
;
}