[PATCH] InstCombine: scalarize vector phis

[Shemer, Anat]

Hi,

I would like to add to InstCombineVectorOps.cpp a function that sclarizes a vector phi instruction if its only use is an extract operation of one element at a constant location. Such vector phi might be created by the vectorization phase and the generated code is non-optimal.
In addition, in the function InstCombiner::visitExtractElementInst I removed the limitation that extract is promoted over a cast only if the cast has only one use. To make this work I replaced the use of Builder->CreateExtractElement() call with InsertNewInstWith(ExtractElementInst::Create()..), which also inserts the new instruction into the worklist.

I also added a test for these 2 cases.

I will appreciate your feedback.

Thanks, Anat




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