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x86/cpu: implement get/set_eflags using intrinsics

Signed-off-by: Diego Biurrun <diego@biurrun.de>
Signed-off-by: Martin Storsjö <martin@martin.st>
tags/n1.0
Ronald S. Bultje Martin Storsjö 13 years ago
parent
commit
358d854df8
2 changed files with 16 additions and 0 deletions
  1. +2
    -0
      configure
  2. +14
    -0
      libavutil/x86/cpu.c

+ 2
- 0
configure View File

@@ -1126,6 +1126,7 @@ HAVE_LIST="
rdtsc
round
roundf
rweflags
sched_getaffinity
sdl
sdl_video_size
@@ -2747,6 +2748,7 @@ elif enabled x86; then
check_code ld immintrin.h "__xgetbv(0)" && enable xgetbv
check_code ld intrin.h "int info[4]; __cpuid(info, 0)" && enable cpuid
check_code ld intrin.h "__rdtsc()" && enable rdtsc
check_code ld intrin.h "unsigned int x = __readeflags()" && enable rweflags

check_code ld mmintrin.h "_mm_empty()" && enable mm_empty



+ 14
- 0
libavutil/x86/cpu.c View File

@@ -62,6 +62,8 @@
} while (0)
#endif /* HAVE_XGETBV */

#if HAVE_INLINE_ASM

#define get_eflags(x) \
__asm__ volatile ("pushfl \n" \
"pop %0 \n" \
@@ -72,6 +74,18 @@
"popfl \n" \
:: "r"(x))

#elif HAVE_RWEFLAGS

#include <intrin.h>

#define get_eflags(x) \
x = __readeflags()

#define set_eflags(x) \
__writeeflags(x)

#endif /* HAVE_INLINE_ASM */

/* Function to test if multimedia instructions are supported... */
int ff_get_cpu_flags_x86(void)
{


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