tree 47572f98426f31f08d3a1cd8d10f609960f9fc9b
parent 2702de3bfa3df791336446082ff8abe0c520ad6b
author Ulrich Weigand <ulrich.weigand@de.ibm.com> 1430854065 +0000
committer Copybara-Service <copybara-worker@google.com> 1601931209 -0700

[SystemZ] Add CodeGen support for v4f32

The architecture doesn't really have any native v4f32 operations except
v4f32->v2f64 and v2f64->v4f32 conversions, with only half of the v4f32
elements being used.  Even so, using vector registers for <4 x float>
and scalarising individual operations is much better than generating
completely scalar code, since there's much less register pressure.
It's also more efficient to do v4f32 comparisons by extending to 2
v2f64s, comparing those, then packing the result.

This particularly helps with llvmpipe.

Based on a patch by Richard Sandiford.

llvm-svn: 236523
GitOrigin-RevId: 80b3af7ab3f8e76507cc4491be1460f1b1d8adb2