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FFmpeg/libswscale/x86

History

Mans Rullgard 90540c2d5a x86: swscale: fix fragile memory accesses ... To access data at multiple fixed offsets from a base address, this code uses a single "m" operand and code of the form "32%0", relying on the memory operand instantiation having no displacement, giving a final result of the form "32(%rax)". If the compiler uses a register and displacement, e.g. "64(%rax)", the end result becomes "3264(%rax)", which obviously does not work. Replacing the "m" operands with "r" operands allows safe addition of a displacement. In theory, multiple memory operands could use a shared base register with different index registers, "(%rax,%rbx)", potentially making more efficient use of registers. In the cases at hand, no such sharing is possible since the addresses involved are entirely unrelated. After this change, the code somewhat rudely accesses memory without using a corresponding memory operand, which in some cases can lead to unwanted "optimisations" of surrounding code. However, the original code also accesses memory not covered by a memory operand, so this is not adding any defect not already present. It is also hightly unlikely that any such optimisations could be performed here since the memory locations in questions are not accessed elsewhere in the same functions. This fixes crashes with suncc. Signed-off-by: Mans Rullgard <mans@mansr.com>		13 years ago
..
Makefile	swscale: x86: Drop pointless _mmx suffix from filenames	13 years ago
input.asm	swscale: implement MMX, SSE2 and AVX functions for RGB32 input.	13 years ago
output.asm	x86inc improvements for 64-bit	13 years ago
rgb2rgb.c	x86: rename libavutil/x86_cpu.h to libavutil/x86/asm.h	13 years ago
rgb2rgb_template.c	x86: swscale: fix fragile memory accesses	13 years ago
scale.asm	x86inc improvements for 64-bit	13 years ago
swscale.c	x86: rename libavutil/x86_cpu.h to libavutil/x86/asm.h	13 years ago
swscale_template.c	x86: build: replace mmx2 by mmxext	13 years ago
w64xmmtest.c	win64: add a XMM clobber test configure option.	13 years ago
yuv2rgb.c	x86: rename libavutil/x86_cpu.h to libavutil/x86/asm.h	13 years ago
yuv2rgb_template.c	x86: build: replace mmx2 by mmxext	13 years ago