[llvm-commits] [PATCH 2/2] fix issues similar to PR11334

[Michael Liao]

Hi

Here're two patches fixing issues similar to but not the exactly same as
PR11334. The second part fixes FPROUND from f64 vector to f32 vector.
This patches add a lowering helper for BUILD_VECTOR to recognize the
scalarized pattern due to FPROUND requires matching elements. A lower
overhead DAG combination of FPROUND is added as well to handle a special
case (v2f64 -> v2f32) in AVX, where it's converted to v4f64 -> v4f32
after type legalization and, instead of vcvtpd2ps, use vcvtpd2psy and
unnecessary 256-bit vector registers. Tests are added/revised as well.

Yours
- Michael

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