4d0151ede5
This adds support for math Abs, Copysign to be instrinsics on ppc64x. New instruction FCPSGN is added to generate fcpsgn. Some new rules are added to improve the int<->float conversions that are generated mainly due to the Float64bits and Float64frombits in the math package. PPC64.rules is also modified as suggested in the review for CL 63290. Improvements: benchmark old ns/op new ns/op delta BenchmarkAbs-16 1.12 0.69 -38.39% BenchmarkCopysign-16 1.30 0.93 -28.46% BenchmarkNextafter32-16 9.34 8.05 -13.81% BenchmarkFrexp-16 8.81 7.60 -13.73% Others that used Copysign also saw smaller improvements. I attempted to make this work using rules since that seems to be preferred, but due to the use of Float64bits and Float64frombits in these functions, several rules had to be added and even then not all cases were matched. Using rules became too complicated and seemed too fragile for these. Updates #21390 Change-Id: Ia265da9a18355e08000818a4fba1a40e9e031995 Reviewed-on: https://go-review.googlesource.com/67130 Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com> Reviewed-by: Keith Randall <khr@golang.org> |
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