On 6 May 2015 at 11:58, Carl Eugen Hoyos <ceho...@ag.or.at> wrote: > Nick Lewycky <nlewycky <at> google.com> writes: > > > This occurs when building ffmpeg with clang > > -fsanitize=address -O1 -fPIE. > > What is the usecase for -O1? >
It's very important for asan. ASan instruments every memory access (outside inline asm, for now) and if we don't run the optimizer then every local variable is a stack allocation with loads and stores, and all those loads and stores get instrumented leading to both crazy slowdown and binary size increase. Did you check performance with and without your patch? > No. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
