[all-commits] [llvm/llvm-project] 63cc9f: [MCA][InOrderIssueStage] Fix LastWriteBackCycle co...

[Andrea Di Biagio via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 63cc9fd579b20e225d1109ebd077a6a13c97c2ab
      https://github.com/llvm/llvm-project/commit/63cc9fd579b20e225d1109ebd077a6a13c97c2ab
  Author: Andrea Di Biagio <andrea.dibiagio at sony.com>
  Date:   2021-05-26 (Wed, 26 May 2021)

  Changed paths:
    M llvm/lib/MCA/Stages/InOrderIssueStage.cpp
    M llvm/test/tools/llvm-mca/AArch64/Cortex/A55-all-stats.s
    M llvm/test/tools/llvm-mca/AArch64/Cortex/A55-all-views.s

  Log Message:
  -----------
  [MCA][InOrderIssueStage] Fix LastWriteBackCycle computation.

Conservatively use the instruction latency to compute the last write-back cycle.
Before this patch, the last write cycle computation was incorrect for store
instructions that didn't declare any register writes.