On 22 March 2012 00:28, Mans Rullgard <mans.rullg...@linaro.org> wrote: > On 20 March 2012 22:59, Michael Hope <michael.h...@linaro.org> wrote: >> I've create a blueprint covering the basic functions in libav that are >> implemented as inline assembly: >> https://blueprints.launchpad.net/gcc-linaro/+spec/investigate-libav-inline-assembly >> >> These are a mix of multiplies, clipping, byte swap, and unaligned >> access. We do OK on half of them but at least byte swap and 32x32 -> >> top half of 64 aren't as good as they could be. > > Some of those are OK in recent gcc versions but horrible in older ones. > For example, the byte swap inline asm is only enabled for gcc older > than 4.5. If you find any others where gcc has improved recently, let > us know so we can make them conditional.
Yip, I saw AV_GCC_VERSION_AT_LEAST() in a few places. We'll check each of the inline routines and report back. -- Michael _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain
