Thorsten Schütt 710a552ded [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

2024-08-16 15:38:56 +02:00

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