PR4340: Run SimplifyDemandedVectorElts on insertelement instructions;
sometimes it can find simplifications that won't be found otherwise.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73006 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 97bd34c..6d2ff0e 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -12579,6 +12579,12 @@
}
}
+ unsigned VWidth = cast<VectorType>(VecOp->getType())->getNumElements();
+ APInt UndefElts(VWidth, 0);
+ APInt AllOnesEltMask(APInt::getAllOnesValue(VWidth));
+ if (SimplifyDemandedVectorElts(&IE, AllOnesEltMask, UndefElts))
+ return &IE;
+
return 0;
}