mirror of https://git.ffmpeg.org/ffmpeg.git
x86: bswap: remove test for bswap instruction
Firstly, this test never worked as intended, always reporting success. Secondly, bswap is available from 486 onward and can thus be assumed present. Signed-off-by: Mans Rullgard <mans@mansr.com>
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@ -1053,7 +1053,6 @@ HAVE_LIST="
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asm_mod_y
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asm_mod_y
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attribute_may_alias
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attribute_may_alias
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attribute_packed
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attribute_packed
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bswap
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closesocket
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closesocket
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cmov
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cmov
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dcbzl
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dcbzl
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@ -2741,8 +2740,6 @@ EOF
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enabled ssse3 && check_asm ssse3 '"pabsw %xmm0, %xmm0"'
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enabled ssse3 && check_asm ssse3 '"pabsw %xmm0, %xmm0"'
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enabled mmx2 && check_asm mmx2 '"pmaxub %mm0, %mm1"'
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enabled mmx2 && check_asm mmx2 '"pmaxub %mm0, %mm1"'
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check_asm bswap '"bswap %%eax" ::: "%eax"'
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if ! disabled_any asm mmx yasm; then
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if ! disabled_any asm mmx yasm; then
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if check_cmd $yasmexe --version; then
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if check_cmd $yasmexe --version; then
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enabled x86_64 && yasm_extra="-m amd64"
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enabled x86_64 && yasm_extra="-m amd64"
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@ -41,14 +41,7 @@ static av_always_inline av_const unsigned av_bswap16(unsigned x)
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#define av_bswap32 av_bswap32
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#define av_bswap32 av_bswap32
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static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
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static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
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{
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{
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#if HAVE_BSWAP
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__asm__("bswap %0" : "+r" (x));
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__asm__("bswap %0" : "+r" (x));
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#else
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__asm__("rorw $8, %w0 \n\t"
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"rorl $16, %0 \n\t"
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"rorw $8, %w0"
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: "+r"(x));
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#endif
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return x;
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return x;
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}
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}
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