Diego Biurrun <di...@biurrun.de> writes:
> From: Ronald S. Bultje <rsbul...@gmail.com>
>
> Signed-off-by: Diego Biurrun <di...@biurrun.de>
> ---
> configure | 3 +++
> libavutil/internal.h | 7 +++++--
> 2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/configure b/configure
> index 3c82eaa..7ef1025 100755
> --- a/configure
> +++ b/configure
> @@ -1118,6 +1118,7 @@ HAVE_LIST="
> MapViewOfFile
> memalign
> mkstemp
> + mm_empty
> mmap
> nanosleep
> netinet_sctp_h
> @@ -2746,6 +2747,8 @@ elif enabled x86; then
>
> check_code ld intrin.h "__rdtsc()" && enable rdtsc
>
> + check_code ld mmintrin.h "_mm_empty()" && enable mm_empty
> +
> enable local_aligned_8 local_aligned_16
>
> # check whether EBP is available on x86
> diff --git a/libavutil/internal.h b/libavutil/internal.h
> index 41e8a9a..e8bcca5 100644
> --- a/libavutil/internal.h
> +++ b/libavutil/internal.h
> @@ -231,7 +231,7 @@ struct AVDictionary {
> # define ONLY_IF_THREADS_ENABLED(x) NULL
> #endif
>
> -#if HAVE_MMX
> +#if HAVE_MMX && HAVE_INLINE_ASM
> /**
> * Empty mmx state.
> * this must be called between any dsp function and float/double code.
> @@ -241,8 +241,11 @@ static av_always_inline void emms_c(void)
> {
> __asm__ volatile ("emms" ::: "memory");
> }
> +#elif HAVE_MMX && HAVE_MM_EMPTY
> +# include <mmintrin.h>
> +# define emms_c _mm_empty
> #else /* HAVE_MMX */
> -#define emms_c()
> +# define emms_c()
> #endif /* HAVE_MMX */
Are there actually any compilers that do _not_ have this intrinsic?
Perhaps we can simply drop the inline asm entirely.
--
Måns Rullgård
m...@mansr.com
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