[PATCH] D60625: [X86][SSE] Lower ICMP EQ(AND(X,C),C) -> SRA(SHL(X,LOG2(C)),BW-1) iff C is power-of-2.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


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Comment at: lib/Target/X86/X86ISelLowering.cpp:19925
+        Op0.hasOneUse()) {
+      KnownBits KnownOp1 = DAG.computeKnownBits(Op1);
+      if (KnownOp1.isConstant() && KnownOp1.getConstant().isPowerOf2()) {
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Would we not have constant folded this somewhere else already such that we could just check for all constant build_vector here?


Repository:
  rL LLVM

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  https://reviews.llvm.org/D60625/new/

https://reviews.llvm.org/D60625