[all-commits] [llvm/llvm-project] c11051: [SelectionDAG] Add a freeze to ISD::ABS expansion.

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c11051a4001c7f89e8655f1776a75110a562a45e
      https://github.com/llvm/llvm-project/commit/c11051a4001c7f89e8655f1776a75110a562a45e
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2022-05-22 (Sun, 22 May 2022)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/test/CodeGen/WebAssembly/PR41149.ll
    M llvm/test/CodeGen/X86/iabs.ll
    M llvm/test/CodeGen/X86/neg-abs.ll
    M llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/basic.ll.expected

  Log Message:
  -----------
  [SelectionDAG] Add a freeze to ISD::ABS expansion.

I had initially assumed this was the problem with
https://github.com/llvm/llvm-project/issues/55271#issuecomment-1133426243

But it turns out that was a simpler issue. This patch is still
more correct than what we were doing before so figured I'd submit
it anyway.

No test case because I'm not sure how to get an undef around
until expansion.

Looking at the test deltas I wonder if it be valid to combine
(sext_inreg (freeze (aextload X))) -> (freeze (sextload X)).

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D126175