[all-commits] [llvm/llvm-project] dbcc13: [X86] Remove isel patterns that include a vselect/...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: dbcc1392b3807d7ddcb000741d2ffb276d90d36b
      https://github.com/llvm/llvm-project/commit/dbcc1392b3807d7ddcb000741d2ffb276d90d36b
  Author: Craig Topper <craig.topper at gmail.com>
  Date:   2020-02-09 (Sun, 09 Feb 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
    M llvm/lib/Target/X86/X86InstrAVX512.td

  Log Message:
  -----------
  [X86] Remove isel patterns that include a vselect/X86selects and a strict FP node.

A vselect+strictfp node is not equivalent to a masked operation.
The exceptions of the strictfp node are not masked by a vselect
after it so we can't match it to a masked operation.

We already had a hack in IsLegalToFold to prevent these patterns from
matching. This patch removes that hack and removes the patterns.