[PATCH] D63382: [InstCombine] fold a shifted zext to a select

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added inline comments.


================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp:936
         ConstantInt::get(Ty, APInt::getSignMask(BitWidth)), X);
 
+  // shl (zext (i1 X)), C1 --> select (X, 1 << C1, 0)
----------------
Not guarded by if (match(Op1, m_Constant(C1))) {

?


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  https://reviews.llvm.org/D63382/new/

https://reviews.llvm.org/D63382