FFmpeg

293MB

Tree: 09d171b988

Author	SHA1	Message	Date
Måns Rullgård	3288177150	ARM: change return type of AV_RN16() to unsigned This prevents gcc inserting useless UXTH instructions, at least in some cases. Originally committed as revision 25212 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago
Måns Rullgård	bdd19e29df	Mark all intreadwrite functions av_always_inline Originally committed as revision 21278 to svn://svn.ffmpeg.org/ffmpeg/trunk	16 years ago
Måns Rullgård	e6956a6e48	ARM: first value loaded in AV_RN64 needs to be early-clobber Originally committed as revision 19656 to svn://svn.ffmpeg.org/ffmpeg/trunk	16 years ago
Måns Rullgård	3c55ce039d	ARM asm for AV_RN() ARMv6 and later support unaligned loads and stores for single word/halfword but not double/multiple. GCC is ignorant of this and will always use bytewise accesses for unaligned data. Casting to an int32_t pointer is dangerous since a load/store double or multiple instruction might be used (this happens with some code in FFmpeg). Implementing the AV_[RW] macros with inline asm using only supported instructions gives fast and safe unaligned accesses. ARM RVCT does the right thing with generic code. This gives an overall speedup of up to 10%. Originally committed as revision 18601 to svn://svn.ffmpeg.org/ffmpeg/trunk	16 years ago