[LLVMdev] Vectorizing overflow intrinsics

[Josh Klontz]

I noticed that the loop vectorizer is not able to vectorize overflow
instrinsics as they are not considered trivially vectorizable intrinsics,
and loop vectorize is also not able to handle extractvalue instructions. Is
this a low-hanging fruit for optimization?

I think it's straightforward to expand these intrinsics into primitive
arithmetic instructions, but it feels like bad design to un-canonicalize
intrinsics. Is there a better alternative?

v/r,
Josh
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