[PATCH] [AArch64] Add patterns to match normal shift nodes: shl, sra, srl

[Jiangning Liu]

The patch LGTM!

Thanks,
-Jiangning


2013/12/19 Hao Liu <Hao.Liu at arm.com>

> Hi t.p.northover,
>
> Hi Tim and reviewers,
>
> This patch fixes the problem that we can't select shl/sra/srl nodes. Match
> shl to USHL instructions. Match sra/srl to NEG and SSHL/USHL instructions
> (negative shift amounts for SSHL/USHL means right shfit). This solution is
> the same as ARM backend.
>
> Code review. Please.
>
> Thanks,
> -Hao
>
> http://llvm-reviews.chandlerc.com/D2439
>
> Files:
>   lib/Target/AArch64/AArch64InstrNEON.td
>   test/CodeGen/AArch64/neon-shl-ashr-lshr.ll
>
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>


-- 
Thanks,
-Jiangning
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