[PATCH] D103788: [InstCombine] Eliminate casts to optimize ctlz operation

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp:954
+  // trunc (ctlz_i32(zext(A), B) --> add(ctlz_i16(A, B), C)
+  if (match(Src, m_OneUse(m_Intrinsic<Intrinsic::ctlz>(m_ZExt(m_Value(A)),
+                                                       m_Value(B))))) {
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We will need to add multiuse tests as well to check that that the m_OneUse is working correctly


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D103788/new/

https://reviews.llvm.org/D103788