[all-commits] [llvm/llvm-project] f40925: [X86] Improve lowering of fptoui

[Craig Topper via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: f40925aa8b3d200b4616eb0b8a772a1812800b21
      https://github.com/llvm/llvm-project/commit/f40925aa8b3d200b4616eb0b8a772a1812800b21
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2020-11-07 (Sat, 07 Nov 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/fp-cvt.ll
    M llvm/test/CodeGen/X86/fp-intrinsics-flags.ll
    M llvm/test/CodeGen/X86/fp-intrinsics.ll
    M llvm/test/CodeGen/X86/fp-strict-scalar-fptoint.ll
    M llvm/test/CodeGen/X86/fp80-strict-scalar.ll
    M llvm/test/CodeGen/X86/scalar-fp-to-i64.ll
    M llvm/test/CodeGen/X86/vec-strict-fptoint-128.ll
    M llvm/test/CodeGen/X86/vec-strict-fptoint-256.ll
    M llvm/test/CodeGen/X86/vec-strict-fptoint-512.ll

  Log Message:
  -----------
  [X86] Improve lowering of fptoui

Invert the select condition when masking in the sign bit of a fptoui operation. Also, rather than lowering the sign mask to select/xor and expecting the select to get cleaned up later, directly lower to shift/xor.

Patch by Layton Kifer!

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D90658