815509ae31
This change includes the following: - Generate LXV/STXV sequences instead of LXVD2X/STXVD2X on power9. These instructions do not require an index register, which allows more loads and stores within a loop without initializing multiple index registers. The LoweredQuadXXX generate LXV/STXV. - Create LoweredMoveXXXShort and LoweredZeroXXXShort for short moves that don't generate loops, and therefore don't clobber the address registers or flags. - Use registers other than R3 and R4 to avoid conflicting with registers that have already been allocated to avoid unnecessary register moves. - Eliminate the use of R14 as scratch register and use R31 instead. - Add PCALIGN when the LoweredMoveXXX or LoweredZeroXXX generates a loop with more than 3 iterations. This performance opportunity was noticed in github.com/golang/snappy benchmarks. Results on power9: WordsDecode1e1 54.1ns ± 0% 53.8ns ± 0% -0.51% (p=0.029 n=4+4) WordsDecode1e2 287ns ± 0% 282ns ± 1% -1.83% (p=0.029 n=4+4) WordsDecode1e3 3.98µs ± 0% 3.64µs ± 0% -8.52% (p=0.029 n=4+4) WordsDecode1e4 66.9µs ± 0% 67.0µs ± 0% +0.20% (p=0.029 n=4+4) WordsDecode1e5 723µs ± 0% 723µs ± 0% -0.01% (p=0.200 n=4+4) WordsDecode1e6 7.21ms ± 0% 7.21ms ± 0% -0.02% (p=1.000 n=4+4) WordsEncode1e1 29.9ns ± 0% 29.4ns ± 0% -1.51% (p=0.029 n=4+4) WordsEncode1e2 2.12µs ± 0% 1.75µs ± 0% -17.70% (p=0.029 n=4+4) WordsEncode1e3 11.7µs ± 0% 11.2µs ± 0% -4.61% (p=0.029 n=4+4) WordsEncode1e4 119µs ± 0% 120µs ± 0% +0.36% (p=0.029 n=4+4) WordsEncode1e5 1.21ms ± 0% 1.22ms ± 0% +0.41% (p=0.029 n=4+4) WordsEncode1e6 12.0ms ± 0% 12.0ms ± 0% +0.57% (p=0.029 n=4+4) RandomEncode 286µs ± 0% 203µs ± 0% -28.82% (p=0.029 n=4+4) ExtendMatch 47.4µs ± 0% 47.0µs ± 0% -0.85% (p=0.029 n=4+4) Change-Id: Iecad3a39ae55280286e42760a5c9d5c1168f5858 Reviewed-on: https://go-review.googlesource.com/c/go/+/226539 Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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README.md
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