[PATCH] Fold selects when the non-selected elements are undef from shufflevectors

[Nadav Rotem]

Hi Filipe, 

We don’t generate new shufflevector instructions during optimizations because the lowering of shuffle instructions is really complicated and we don’t want to generate a shuffle that we don’t lower by accident. 

Thanks,
Nadav

On May 2, 2014, at 4:34 PM, Filipe Cabecinhas <filcab+llvm.phabricator at gmail.com> wrote:

> Remove unused argument
> 
> http://reviews.llvm.org/D3561
> 
> Files:
>  lib/Transforms/InstCombine/InstCombineSelect.cpp
>  test/Transforms/InstCombine/select.ll
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