This patch modifies the FFmpeg build system to remove the explicit disabling of GCC's auto-vectorization feature.
Modern GCC versions have demonstrated stable auto-vectorization capabilities through extensive optimizations in loop analysis and SIMD code generation. The explicit -fno-tree-vectorize flag originally added in commit 973859f (2009) to workaround early GCC vectorization instability is no longer necessary for recent gcc versions. Key improvements justifying this change: 1. Enhanced heuristics for loop vectorization cost models 2. Mature handling of alignment and memory access patterns 3. Robust fallback mechanisms for unsupported architectures This change allows FFmpeg to benefit from automated SIMD optimizations when built with -O3 optimization level, particularly improving performance on x86_64 (AVX), ARM64 (SVE) and RISC-V(RVV) architectures. [1] https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/973859f5230e77beea7bb59dc081870689d6d191 Version log: Only allow GCC versions >= 13 to use auto-vectorization. Disscussion see: https://patchwork.ffmpeg.org/project/ffmpeg/patch/20250521061750.54882-1-jia...@iscas.ac.cn/ --- configure | 1 - 1 file changed, 1 deletion(-) Signed-off-by: Jiawei <jia...@iscas.ac.cn> --- configure | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/configure b/configure index 3730b0524c..91e3e107c2 100755 --- a/configure +++ b/configure @@ -7656,7 +7656,11 @@ if enabled icc; then disable aligned_stack fi elif enabled gcc; then - check_optflags -fno-tree-vectorize + gcc_version=$($cc -dumpversion) + major_version=${gcc_version%%.*} + if [ $major_version -lt 13 ]; then + check_optflags -fno-tree-vectorize + fi check_cflags -Werror=format-security check_cflags -Werror=implicit-function-declaration check_cflags -Werror=missing-prototypes -- 2.43.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
