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Re: [PATCH, testsuite]: Add -mprefer-avx128 to DEFAULT_VECTCFLAGS
On Mon, 9 May 2011, H.J. Lu wrote:
> > Index: lib/target-supports.exp
> > ===================================================================
> > --- lib/target-supports.exp ? ? (revision 173569)
> > +++ lib/target-supports.exp ? ? (working copy)
> > @@ -3845,6 +3845,8 @@
> > ? ? ? ? set dg-do-what-default run
> > ? ? } elseif { [istarget "i?86-*-*"] || [istarget "x86_64-*-*"] } {
> > ? ? ? ? lappend DEFAULT_VECTCFLAGS "-msse2"
> > + ? ? ? # FIXME: Vectorizer testsuite assumes 128bit vector widths.
> > + ? ? ? lappend DEFAULT_VECTCFLAGS "-mprefer-avx128"
> > ? ? ? ? if { [check_effective_target_sse2_runtime] } {
> > ? ? ? ? ? ? set dg-do-what-default run
> > ? ? ? ? } else {
> >
>
> That means 256bit vectorizer won't be tested. I think we
> should investigate each testcase and update it if needed.
I think we should work out how to get the various vectorizer testsuites to
run multiple times, with each vector ISA variant that's available on the
target architecture (so you'd test SSE; 128-bit AVX; 256-bit AVX; and
maybe other variants - each variant tested with execution testing if
there's hardware support, compile testing otherwise), like the torture
testsuites run each test multiple times with different options. Though
that certainly complicates all the effective target tests for
vectorization support, since the results may depend on the options as well
as the target.
--
Joseph S. Myers
joseph@codesourcery.com