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cmd/compile: explore optimizations for fixed-length array copies · Issue #46529...
source link: https://github.com/golang/go/issues/46529
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#46505 (comment) reports these results for this benchmark:
BenchmarkNamed-8 201051339 6.263 ns/op
BenchmarkCopy-8 172203873 6.071 ns/op
BenchmarkPointer-8 1000000000 1.031 ns/op
We should see if cmd/compile can optimize the first two as efficiently as the last.
One observation though is they have different semantics: SumNamed and SumCopy need to support partial copies if len(b) < Size256, but SumPointer panics in this case.
We could probably efficiently handle copy(ret[:], b[:Size256]) though, by rewriting it into ret = *(*[Size256]byte)(b) in the frontend.
Marking for Go 1.18 to at least explore possibilities here.
Related #20859.
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