[all-commits] [llvm/llvm-project] 710a55: [GlobalIsel] Revisit ext of ext. (#102769)

[Thorsten Schütt via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 710a552dedbf1a28cebac78b481cb78138fbc454
      https://github.com/llvm/llvm-project/commit/710a552dedbf1a28cebac78b481cb78138fbc454
  Author: Thorsten Schütt <schuett at gmail.com>
  Date:   2024-08-16 (Fri, 16 Aug 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/include/llvm/Target/GlobalISel/Combine.td
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/lib/CodeGen/GlobalISel/CombinerHelperCasts.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/combine-ext.mir

  Log Message:
  -----------
  [GlobalIsel] Revisit ext of ext. (#102769)

Credits:
https://reviews.llvm.org/D86516

combine-ext.mir

Notable semantic changes:
InstCombine does not mix zero and sign extend,
  see CastInst::isEliminableCastPair.
New version has legality checks.
Folds sext/zext of anyext -> sext/zext
Support for nneg

Future work:
nneg zext of sext -> sext
sext of nneg zext -> sext



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