https://bugs.gentoo.org/911582 https://trac.ffmpeg.org/ticket/10405 https://git.videolan.org/?p=ffmpeg.git;a=commit;h=25cd95a9dc3510c3cc0d7aad6f9d83f6a1078c7e https://sourceware.org/PR30578 https://gcc.gnu.org/PR108941 From 25cd95a9dc3510c3cc0d7aad6f9d83f6a1078c7e Mon Sep 17 00:00:00 2001 From: =?utf8?q?R=C3=A9mi=20Denis-Courmont?= Date: Sun, 16 Jul 2023 18:18:02 +0300 Subject: [PATCH] avcodec/x86/mathops: clip constants used with shift instructions within inline assembly Fixes assembling with binutil as >= 2.41 Signed-off-by: James Almer (cherry picked from commit effadce6c756247ea8bae32dc13bb3e6f464f0eb) --- a/libavcodec/x86/mathops.h +++ b/libavcodec/x86/mathops.h @@ -35,12 +35,20 @@ static av_always_inline av_const int MULL(int a, int b, unsigned shift) { int rt, dummy; + if (__builtin_constant_p(shift)) __asm__ ( "imull %3 \n\t" "shrdl %4, %%edx, %%eax \n\t" :"=a"(rt), "=d"(dummy) - :"a"(a), "rm"(b), "ci"((uint8_t)shift) + :"a"(a), "rm"(b), "i"(shift & 0x1F) ); + else + __asm__ ( + "imull %3 \n\t" + "shrdl %4, %%edx, %%eax \n\t" + :"=a"(rt), "=d"(dummy) + :"a"(a), "rm"(b), "c"((uint8_t)shift) + ); return rt; } @@ -113,19 +121,31 @@ __asm__ volatile(\ // avoid +32 for shift optimization (gcc should do that ...) #define NEG_SSR32 NEG_SSR32 static inline int32_t NEG_SSR32( int32_t a, int8_t s){ + if (__builtin_constant_p(s)) __asm__ ("sarl %1, %0\n\t" : "+r" (a) - : "ic" ((uint8_t)(-s)) + : "i" (-s & 0x1F) ); + else + __asm__ ("sarl %1, %0\n\t" + : "+r" (a) + : "c" ((uint8_t)(-s)) + ); return a; } #define NEG_USR32 NEG_USR32 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){ + if (__builtin_constant_p(s)) __asm__ ("shrl %1, %0\n\t" : "+r" (a) - : "ic" ((uint8_t)(-s)) + : "i" (-s & 0x1F) ); + else + __asm__ ("shrl %1, %0\n\t" + : "+r" (a) + : "c" ((uint8_t)(-s)) + ); return a; } -- 2.30.2