[all-commits] [llvm/llvm-project] 587af8: [X86] Add a flag to guard the wide load

[weiguozhi via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 587af86f1d8adc77b229ed27b2f553e99f9710cd
      https://github.com/llvm/llvm-project/commit/587af86f1d8adc77b229ed27b2f553e99f9710cd
  Author: Guozhi Wei <carrot at google.com>
  Date:   2020-06-02 (Tue, 02 Jun 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
    M llvm/lib/Target/X86/X86InstrInfo.td
    A llvm/test/CodeGen/X86/no-wide-load.ll

  Log Message:
  -----------
  [X86] Add a flag to guard the wide load

As shown in http://lists.llvm.org/pipermail/llvm-dev/2020-May/141854.html,
widen load can also cause stall. Add a flag to guard the widening code,
so users can disable it and evaluate its performance impact.

Differential Revision: https://reviews.llvm.org/D80943