[PATCH] ARM64: Combine shifts and uses to bit-extract instruction from different basic block

[Yi Jiang]

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On Apr 14, 2014, at 5:25 PM, yijiang wrote:

> Hi Quentin et al. ,
> <extractbit.patch>
> Could you help to review this patch? Thank you very much.
> 
> In this patch, I basically trying to do two things:
> 1) Try to detect potential opportunities, sink the shifts  and combine shifts and uses from different basic blocks that could generate bit-extract instruction and . 
> 2)  Recognize more patterns in instruction selection to generate bit-extract instructions, also try to make the instruction type more consistent to expose more opportunities in machine CSE. 
> 
> Now it is only enabled in ARM64. The test-suite result indicates that it will improve crafty by 1.21%, this can also be reproduced if the input is “ref” size. 
> External/SPEC/CINT2000/186_crafty/186_crafty	-1.21%	9.5801	9.4639	-	-0.00%
> 

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