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FFmpeg/libavutil/x86

History

Lynne bbe95f7353 x86: replace explicit REP_RETs with RETs ... From x86inc: > On AMD cpus <=K10, an ordinary ret is slow if it immediately follows either > a branch or a branch target. So switch to a 2-byte form of ret in that case. > We can automatically detect "follows a branch", but not a branch target. > (SSSE3 is a sufficient condition to know that your cpu doesn't have this problem.) x86inc can automatically determine whether to use REP_RET rather than REP in most of these cases, so impact is minimal. Additionally, a few REP_RETs were used unnecessary, despite the return being nowhere near a branch. The only CPUs affected were AMD K10s, made between 2007 and 2011, 16 years ago and 12 years ago, respectively. In the future, everyone involved with x86inc should consider dropping REP_RETs altogether.		2 years ago
..
Makefile	…
asm.h	…
bswap.h	…
cpu.c	avutil/cpu: add AVX512 Icelake flag	3 years ago
cpu.h	avutil/cpu: add AVX512 Icelake flag	3 years ago
cpuid.asm	…
emms.asm	…
emms.h	…
fixed_dsp.asm	…
fixed_dsp_init.c	lavu/fixed_dsp: add missing av_restrict qualifiers	2 years ago
float_dsp.asm	x86: replace explicit REP_RETs with RETs	2 years ago
float_dsp_init.c	avutil/x86/float_dsp: add fma3 for scalarproduct	2 years ago
imgutils.asm	…
imgutils_init.c	…
intmath.h	…
intreadwrite.h	avutil/x86/intreadwrite: Add ability to detect whether MMX code is used	2 years ago
lls.asm	x86: replace explicit REP_RETs with RETs	2 years ago
lls_init.c	…
pixelutils.asm	avutil/x86/pixelutils: Remove obsolete MMX(EXT) functions	3 years ago
pixelutils.h	…
pixelutils_init.c	avutil/x86/pixelutils: Remove obsolete MMX(EXT) functions	3 years ago
timer.h	…
tx_float.asm	x86/tx_float: fix stray change in 15xM FFT and replace imul->lea	2 years ago
tx_float_init.c	lavu/tx: refactor to explicitly track and convert lookup table order	2 years ago
w64xmmtest.h	…
x86inc.asm	avutil/cpu: add AVX512 Icelake flag	3 years ago
x86util.asm	…