[dpdk-dev] [PATCH v4 3/5] hash: add fallback to software CRC32 implementation

[Yerden Zhumabekov]

18.11.2014 23:29, Wang, Shawn пишет:
> I have a general question about using CPUID to detect supported instruction set.
> What if we are compiling the software with some old hardware which does not support SSE4.2, but run it on new hardware which does support SSE4.2. Is there still a static way to force the compiler to turn on the SSE4.2 support? 
> I guess for SSE4.2, most of the CPU has support for it now. But for AVX2, this might not be the case.
According to gcc 4.7 changes (https://gcc.gnu.org/gcc-4.7/changes.html)
they've added support for AVX2 instructions since that version.
Use -mavx2 or -march=core-avx2. The latter seems to be supported by ICC
as well, according to Google :)

-- 
Sincerely,

Yerden Zhumabekov
State Technical Service
Astana, KZ