On Wed, Apr 22, 2020 at 07:49:16PM +0200,
frederic.recou...@univ-grenoble-alpes.fr wrote:
> From: Frédéric Recoules <frederic.recou...@orange.fr>
>
> ---
> configure | 4 ++++
> libavutil/x86/asm.h | 20 ++++++++++++++++++++
> 2 files changed, 24 insertions(+)
>
> diff --git a/configure b/configure
> index 6533b43250..ddfea5ccfa 100755
> --- a/configure
> +++ b/configure
> @@ -2275,6 +2275,7 @@ TOOLCHAIN_FEATURES="
> symver_gnu_asm
> vfp_args
> xform_asm
> + mmx_clobbers
> xmm_clobbers
> "
>
> @@ -5917,6 +5918,9 @@ EOF
> check_inline_asm ebx_available '""::"b"(0)' &&
> check_inline_asm ebx_available '"":::"%ebx"'
>
> + # check whether mmx clobbers are supported
> + check_inline_asm mmx_clobbers '"":::"%mm0"'
> +
> # check whether xmm clobbers are supported
> check_inline_asm xmm_clobbers '"":::"%xmm0"'
>
> diff --git a/libavutil/x86/asm.h b/libavutil/x86/asm.h
> index 9bff42d628..bb3c13f5c1 100644
> --- a/libavutil/x86/asm.h
> +++ b/libavutil/x86/asm.h
> @@ -79,6 +79,26 @@ typedef int x86_reg;
> # define BROKEN_RELOCATIONS 1
> #endif
>
> +/*
> + * If gcc is not set to support mmx (-mmmx) it will not accept mmx registers
> + * in the clobber list for inline asm. MMX_CLOBBERS takes a list of mmx
> + * registers to be marked as clobbered and evaluates to nothing if they are
> + * not supported, or to the list itself if they are supported. Since a
> clobber
> + * list may not be empty, XMM_CLOBBERS_ONLY should be used if the mmx
^^^^
typo[...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Frequently ignored answer#1 FFmpeg bugs should be sent to our bugtracker. User questions about the command line tools should be sent to the ffmpeg-user ML. And questions about how to use libav* should be sent to the libav-user ML.
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