From: "Ronald S. Bultje" <[email protected]>
---
configure | 3 +++
libavutil/x86/cpu.c | 14 ++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/configure b/configure
index 598b33c..bb4d55f 100755
--- a/configure
+++ b/configure
@@ -1126,6 +1126,7 @@ HAVE_LIST="
posix_memalign
round
roundf
+ rweflags
sched_getaffinity
sdl
sdl_video_size
@@ -2649,6 +2650,8 @@ EOF
check_code cc mmintrin.h "_mm_empty()" && enable mm_empty
check_code cc immintrin.h "_xgetbv(0)" && enable xgetbv
check_code cc intrin.h "int info[4]; _cpuid(info, 0)" && enable cpuid
+check_code cc intrin.h "unsigned int x = __readeflags(); __writeeflags(x)" &&
+ enable rweflags
_restrict=
for restrict_keyword in restrict __restrict__ __restrict; do
diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c
index 70e3125..6ddfebd 100644
--- a/libavutil/x86/cpu.c
+++ b/libavutil/x86/cpu.c
@@ -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)
{
--
1.7.9.5
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