[PATCH] D88316: [InstCombine] recognizeBSwapOrBitReverseIdiom - recognise zext(bswap(trunc(x))) patterns (PR39793)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added inline comments.


================
Comment at: llvm/lib/Transforms/Utils/Local.cpp:3030
+  // If the upper bits are zero, then attempt to perform as a truncated op.
+  if (BitProvenance[BitProvenance.size() - 1] == BitPart::Unset) {
+    while (!BitProvenance.empty() && BitProvenance.back() == BitPart::Unset)
----------------
Super minor: this then should be `if (BitProvenance.back() == BitPart::Unset) {`


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CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D88316/new/

https://reviews.llvm.org/D88316