[all-commits] [llvm/llvm-project] 5c74c6: [AArch64] Use CMTST for != 0 vector compares (vnot...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5c74c6be3c291c27b78918aefe4017ea59b4ede8
      https://github.com/llvm/llvm-project/commit/5c74c6be3c291c27b78918aefe4017ea59b4ede8
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2021-02-24 (Wed, 24 Feb 2021)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/test/CodeGen/AArch64/neon-compare-instructions.ll
    M llvm/test/CodeGen/AArch64/vec_umulo.ll

  Log Message:
  -----------
  [AArch64] Use CMTST for != 0 vector compares (vnot (CMEQz A)).

(CMTST A, A) will only set elements to 0 if the element is 0 in A. Use
it for != 0 compares, which currently use (vnot (CMEQz A)). This saves a
mvn instruction.

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D97303