[PATCH][X86] Refactor peepholes for masked shift amount into a multiclass

[Quentin Colombet]

Hi Adam,

LGTM.

Thanks,
-Quentin

On Mar 3, 2014, at 5:02 PM, Adam Nemet <anemet at apple.com> wrote:

> The peephole (shift x, (and y, 31)) -> (shift x, y) is repeated for each
> integer type and each shift variant.
> 
> To improve this a new multiclass is added that covers all integer types.  The
> shift patterns are now instantiated from this.  I am planning to add new
> instances for rotates as well.
> 
> No functional change intended:
> 
>  * test/CodeGen/X86/shift-and.ll provides coverage
> 
>  * Compared the expanded tablegen output and matched up the defs for these
>    Pat<>s before and after
> 
> <0005-X86-Refactor-peepholes-for-masked-shift-amount-into-.patch>_______________________________________________
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