[PATCH][PR21138] Lower <u, u, u, u, idx1, idx2, idx3, idx4> using 256bit shuffle instead of splitting

[Quentin Colombet]

With the patch!
On Oct 15, 2014, at 5:42 PM, Quentin Colombet <qcolombet at apple.com> wrote:

> Hi Chandler,
> 
> Attached is a tentative patch to fix PR21138 http://llvm.org/bugs/show_bug.cgi?id=21138
> 
> I have not tested it against the test suite, I wanted to know if the direction matches what you expected first.
> In particular, the check that guards the transformation is simple than I would have expected at first, but I did not find cases where the transformation is actually not beneficial (though, I haven’t tried hard).
> 
> Anyhow, let me know what you think on the patch before I make the measurements.
> 
> Thanks,
> -Quentin
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