Which version of GCC supports intrinsics independent of -mXXX?

Jeffrey Walton noloader@gmail.com
Mon Apr 17 13:55:00 GMT 2017


> I'm trying to use SSE2 and SSSE3 intrinsics on some old hardware. The
> program performs its own CPUID checks, so it knows when it can enter a
> particular code path.
>
> The program is compiled with -march=native, but the machine lacks
> SSSE3 and above. It causing the compile to fail.
>
> I recall seeing a GCC bug report that enabled intrinsics all time,
> regardless of the machine's features. I can no longer locate the bug
> report, so I don't know which version of GCC supports the feature.
>
> My question is, which version of GCC supports intrinsics independent of -mXXX?

Its supposed to be GCC 4.9, but I don't believe it works as reported.
The intrinsics are not available in GCC 5.4 (maybe something changed).

Here is the issue: "Please make the intrinsics headers like
immintrin.h be usable without compiler flags",
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57202.

Jeff



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