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cmd/compile: use SBFX / UBFX instructions for bit extraction on ARMv7 #20966

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benshi001 opened this issue Jul 10, 2017 · 3 comments
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cmd/compile: use SBFX / UBFX instructions for bit extraction on ARMv7 #20966

benshi001 opened this issue Jul 10, 2017 · 3 comments
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FrozenDueToAge Performance
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Go1.10

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@benshi001
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(SLLconst (SRAconst x [d]) [c]) -> SBFX
(SRAconst (SLLconst x [d]) [c]) -> SBFX
(SLLconst (SRLconst x [d]) [c]) -> UBFX
(SRLconst (SLLconst x [d]) [c]) -> UBFX

SBFX and UBFX are available on ARMv7.
@ALTree ALTree added this to the Go1.10 milestone Jul 10, 2017
@benshi001
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Please also assign it to me. ^_^

@ALTree
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ALTree commented Jul 12, 2017 •
edited

@benshi001 Can you change the title to "cmd/compile: use SBFX / UBFX instructions for XXX on ARMv7" (where XXX is the operation you're optimizing, I think it's "bit extraction"(?)).

@benshi001 benshi001 changed the title cmd/compile: optimizate with SBFX / UBFX cmd/compile: use SBFX / UBFX instructions for bit extraction on ARMv7 Jul 12, 2017
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Change https://golang.org/cl/64950 mentions this issue: cmd/compile: optimized ARM code with BFX/BFXU

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