[PATCH] Optimize insertqi when we copy all the lower 64 bits.

[Jim Grosbach]

+Nadav

Hi Filipe,

I like the idea of this transform. Nadav will have a better idea than I about whether this is the right place to go about it.

-Jim

On Apr 14, 2014, at 7:52 PM, Filipe Cabecinhas <filcab+llvm.phabricator at gmail.com> wrote:

>  Updated the patch to add range merging, generating fewer insertqi when possible.
> 
>  This also allows us to find more places to do the first opt.
> 
> Hi grosbach,
> 
> http://reviews.llvm.org/D3357
> 
> CHANGE SINCE LAST DIFF
>  http://reviews.llvm.org/D3357?vs=8482&id=8521#toc
> 
> Files:
>  lib/Transforms/InstCombine/InstCombineCalls.cpp
>  test/Transforms/InstCombine/vec_demanded_elts.ll
> <D3357.2.patch>