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Re: -mavx option


On Thursday 26 of January 2012 09:52:22 Ulrich Drepper wrote:
> I think gcc is missing an option since -mavx controls two different
> things.  First, the generation of VEX-encoded instructions.  Second,
> the use of ymm registers.  The latter is not always available when the
> former is and using VEX-encoded instructions by themselves can have an
> advantage.  Currently, when OSXAVE is not available (use xgetbv to
> test etc etc) then I cannot use code which gcc generates with -mavx
> even though I am only interested in the VEX encoding.
> 
> Could we have a -mvex option which is automatically implied in -mavx?

there's a -msse2avx option. is it enough?


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