From 5b0d35eaedbb08d0c11fa4f2b47a24d91aaa294d Mon Sep 17 00:00:00 2001 From: Mans Rullgard Date: Mon, 12 Dec 2011 01:33:17 +0000 Subject: [PATCH] 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 --- configure | 3 --- libavutil/x86/bswap.h | 7 ------- 2 files changed, 10 deletions(-) diff --git a/configure b/configure index a0dc6e08f8..567fa9d1f4 100755 --- a/configure +++ b/configure @@ -1053,7 +1053,6 @@ HAVE_LIST=" asm_mod_y attribute_may_alias attribute_packed - bswap closesocket cmov dcbzl @@ -2741,8 +2740,6 @@ EOF enabled ssse3 && check_asm ssse3 '"pabsw %xmm0, %xmm0"' enabled mmx2 && check_asm mmx2 '"pmaxub %mm0, %mm1"' - check_asm bswap '"bswap %%eax" ::: "%eax"' - if ! disabled_any asm mmx yasm; then if check_cmd $yasmexe --version; then enabled x86_64 && yasm_extra="-m amd64" diff --git a/libavutil/x86/bswap.h b/libavutil/x86/bswap.h index 6840b632cb..c6cf007c86 100644 --- a/libavutil/x86/bswap.h +++ b/libavutil/x86/bswap.h @@ -41,14 +41,7 @@ static av_always_inline av_const unsigned av_bswap16(unsigned x) #define av_bswap32 av_bswap32 static av_always_inline av_const uint32_t av_bswap32(uint32_t x) { -#if HAVE_BSWAP __asm__("bswap %0" : "+r" (x)); -#else - __asm__("rorw $8, %w0 \n\t" - "rorl $16, %0 \n\t" - "rorw $8, %w0" - : "+r"(x)); -#endif return x; }