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FFmpeg/libavutil/x86

History

Mans Rullgard 5b170c0bea x86: remove FASTDIV inline asm ... GCC 4.3 and later do the right thing with the plain C code. Earlier versions in 32-bit mode generate one extra instruction, needlessly zeroing what would be the high half of the shifted value. At least two gcc configurations miscompile the inline asm in some situations. In 64-bit mode, all gcc versions generate imul r64, r64 followed by shr. On Intel i7 and later, this imul is faster 32-bit mul. On older Intel and all AMD, it is slightly slower. On Atom it is much slower. Considering where the FASTDIV macro is used, any overall negative performance impact of this change should be negligible. If anyone cares, they should file a bug against gcc and get the instruction selection fixed. Signed-off-by: Mans Rullgard <mans@mansr.com>		13 years ago
..
Makefile	Add a float DSP framework to libavutil	13 years ago
asm.h	x86: move MANGLE() and related macros to libavutil/x86/asm.h	13 years ago
bswap.h	x86: place some inline asm under #if HAVE_INLINE_ASM	13 years ago
cpu.c	x86: rename libavutil/x86_cpu.h to libavutil/x86/asm.h	13 years ago
float_dsp.asm	x86: add colons after labels	13 years ago
float_dsp_init.c	float_dsp: add x86-optimized functions for vector_fmac_scalar()	13 years ago
intreadwrite.h	Replace FFmpeg with Libav in licence headers	14 years ago
timer.h	x86/timer: implement an intrinsic-based version for rdtsc (AV_READ_TIME).	13 years ago
w64xmmtest.h	Add more missing includes after removing the implicit common.h	13 years ago
x86inc.asm	x86: fix build with nasm 2.08	13 years ago
x86util.asm	dsputil: x86: add SHUFFLE_MASK_W macro	13 years ago