[all-commits] [llvm/llvm-project] 24bf8f: [llvm-exegesis] Do not try to assign random regist...

[Clement Courbet via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 24bf8faabd625c213e6275c7cd77d4883f564489
      https://github.com/llvm/llvm-project/commit/24bf8faabd625c213e6275c7cd77d4883f564489
  Author: Clement Courbet <courbet at google.com>
  Date:   2020-10-29 (Thu, 29 Oct 2020)

  Changed paths:
    A llvm/test/tools/llvm-exegesis/X86/latency-IN16rr.s
    M llvm/tools/llvm-exegesis/lib/SerialSnippetGenerator.cpp

  Log Message:
  -----------
  [llvm-exegesis] Do not try to assign random registers twice.

Doing a random assignment assigns both tested (forward) and back-to-back
(backward) instructions.

When none of the tested instruction and back-to-back instruction have
implicit aliasing, we're currently trying to do a random register
asignment twice.

Fix this (see PR26418).

Differential Revision: https://reviews.llvm.org/D90380