[PATCH] D31196: [InstCombine] fold insertelement of scalar constant into vector of constants

Sanjay Patel via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Mar 21 10:58:11 PDT 2017

spatel created this revision.
Herald added a subscriber: mcrosier.

Keeping the various operand names straight for a pair of insertelements is challenging. I've reused the existing code in the patch, but if I renamed those code variables, it might be something like this:
insertelement (insertelement VectorC, X, Idx1C), ScalarC, Idx0C --> insertelement NewVectorC, X, Idx1C

So we're putting the scalar constant from the 2nd instruction into the vector constant operand of the 1st instruction because that eliminates the 2nd insertelement.



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