40e25895e3
The functions Float64bits and Float64frombits perform poorly on ppc64x because the int<->float conversions often result in load and store sequences to handle the type change. This patch adds more rules to recognize those sequences and use register to register moves and avoid unnecessary loads and stores where possible. There were some existing rules to improve these conversions, but this provides additional improvements. Included here: - New instruction FCFIDS to improve on conversion to 32 bit - Rename Xf2i64 and Xi2f64 as MTVSRD, MFVSRD, to match the asm - Add rules to lower some of the load/store sequences for - Added new go asm to ppc64.s testcase. conversions Improvements: BenchmarkAbs-16 2.16 0.93 -56.94% BenchmarkCopysign-16 2.66 1.18 -55.64% BenchmarkRound-16 4.82 2.69 -44.19% BenchmarkSignbit-16 1.71 1.14 -33.33% BenchmarkFrexp-16 11.4 7.94 -30.35% BenchmarkLogb-16 10.4 7.34 -29.42% BenchmarkLdexp-16 15.7 11.2 -28.66% BenchmarkIlogb-16 10.2 7.32 -28.24% BenchmarkPowInt-16 69.6 55.9 -19.68% BenchmarkModf-16 10.1 8.19 -18.91% BenchmarkLog2-16 17.4 14.3 -17.82% BenchmarkCbrt-16 45.0 37.3 -17.11% BenchmarkAtanh-16 57.6 48.3 -16.15% BenchmarkRemainder-16 76.6 65.4 -14.62% BenchmarkGamma-16 26.0 22.5 -13.46% BenchmarkPowFrac-16 197 174 -11.68% BenchmarkMod-16 112 99.8 -10.89% BenchmarkAsinh-16 59.9 53.7 -10.35% BenchmarkAcosh-16 44.8 40.3 -10.04% Updates #21390 Change-Id: I56cc991fc2e55249d69518d4e1ba76cc23904e35 Reviewed-on: https://go-review.googlesource.com/63290 Reviewed-by: Michael Munday <mike.munday@ibm.com> |
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The Go Programming Language
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