[Mesa-dev] [Bug 106644] [llvmpipe] Mesa 18.1.2 fails lp_test_format, lp_test_arit, lp_test_blend, lp_test_printf, lp_test_conv tests

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106644

--- Comment #25 from Ben Crocker <bcrocker at redhat.com> ---
According to the Wikipedia article, the 970 is a Power ISA v2.03 (2002-2007)
CPU,
while VSX was not introduced until Power ISA v2.06 (February 2009) and POWER7.

So it seems to me that llc should recognize which version of the ISA each
CPU implements, and that it should disallow combinations like
-mcpu=970 -mattr=+altivec,+vsx

I filed the following bug against LLVM/llc:

https://bugs.llvm.org/show_bug.cgi?id=38075
(llc for Power allows illegal combinations of -mcpu and -mattr)

In the meantime, you can control VSX usage from Mesa in a couple of ways:
% export GALLIVM_MATTRS=<string>, e.g.
% export GALLIVM_MATTRS="+altivec,-vsx"
to keep AltiVec but turn off VSX code generation, or

% export GALLIVM_VSX=0
to disable VSX code generation.

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