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x86/timer: implement an intrinsic-based version for rdtsc (AV_READ_TIME).

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This commit is contained in:
Ronald S. Bultje 2012-07-07 13:30:11 -07:00
parent 25b51b2c44
commit 07b287020c
2 changed files with 11 additions and 0 deletions
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3
configure vendored
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@ -1121,6 +1121,7 @@ HAVE_LIST="
netinet_sctp_h
poll_h
posix_memalign
rdtsc
round
roundf
sched_getaffinity
@ -2642,6 +2643,8 @@ check_cc <<EOF && enable inline_asm
void foo(void) { __asm__ volatile ("" ::); }
EOF
check_code cc intrin.h "__rdtsc()" && enable rdtsc
_restrict=
for restrict_keyword in restrict __restrict__ __restrict; do
check_cc <<EOF && _restrict=$restrict_keyword && break

8
libavutil/x86/timer.h
View File

@ -23,6 +23,8 @@
#include <stdint.h>
#if HAVE_INLINE_ASM
#define AV_READ_TIME read_time
static inline uint64_t read_time(void)
@ -32,4 +34,10 @@ static inline uint64_t read_time(void)
return ((uint64_t)d << 32) + a;
}
#elif HAVE_RDTSC
#define AV_READ_TIME __rdtsc
#endif /* HAVE_INLINE_ASM */
#endif /* AVUTIL_X86_TIMER_H */