[PATCH] D105764: [InstCombine] Fold ashr(or(neg(x),x),bw-1) --> sext(icmp_ne(x,0)) (PR50816)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added inline comments.


================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp:1330
+    if (ShAmt == BitWidth - 1 &&
+        match(Op0, m_OneUse(m_c_Or(m_Neg(m_Value(X)), m_Value(Y)))) && X == Y)
+      return new SExtInst(Builder.CreateICmpNE(X, ConstantInt::get(Ty, 0)), Ty);
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  https://reviews.llvm.org/D105764/new/

https://reviews.llvm.org/D105764