[all-commits] [llvm/llvm-project] 0dbc46: [X86] Handle splats in LowerBUILD_VECTORvXi1 by di...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 0dbc4658d88ccb321a7b372f4af19bbaa00722fb
      https://github.com/llvm/llvm-project/commit/0dbc4658d88ccb321a7b372f4af19bbaa00722fb
  Author: Craig Topper <craig.topper at gmail.com>
  Date:   2020-02-18 (Tue, 18 Feb 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp

  Log Message:
  -----------
  [X86] Handle splats in LowerBUILD_VECTORvXi1 by directly emitting scalar selects instead of deferring that to LowerSELECT.

LoweSELECT will detect the constant inputs and convert to scalar
selects, but we can do it directly here.

I might remove some of the code from LowerSELECT and move it to
DAG combine so doing this explicitly will make us less dependent
on it happening in lowering.