[LLVMdev] Please benchmark new x86 vector shuffle lowering, planning to make it the default very soon!

[Chandler Carruth]

After some adding some serious ninja-ry to the new shuffle lowering...

On Fri, Sep 19, 2014 at 11:53 AM, Quentin Colombet <qcolombet at apple.com>
wrote:

> 2. none_useless_shuflle none
> Instead of using a single move to materialize a zero extended constant
> into a vector register, we explicitly zeroed a vector register and use a
> shuffle.
>

... this test case is fixed, as is your 'pxor.ll' test case from earlier,
and the 'movss' test cases from Andrea earlier in the thread (I suspect).
Turns out that there is a trick that we can use in the existing tables to
get most of the memory-operand-movss optimizations.

I think this is all of the non-avx-specific issues raised thus far.... One
of the issues isn't avx specific but can only be solved with avx. Anyways,
I'll look into some of the AVX issues next.
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