| commit | 816ff44479ae1f1e9459221f63206e93f6f12824 | [log] [tgz] |
|---|---|---|
| author | Lynn Boger <laboger@linux.vnet.ibm.com> | Fri Oct 04 16:03:36 2019 -0400 |
| committer | Lynn Boger <laboger@linux.vnet.ibm.com> | Tue Oct 08 16:41:02 2019 +0000 |
| tree | cd4fbeed58311d7ad586f336fc77c99aa53ccc64 | |
| parent | 9ce5cad0aaf5eceda6927acec2db96ba5fd7ef07 [diff] |
cmd/compile: use vsx loads and stores for LoweredMove, LoweredZero on ppc64x This improves the code generated for LoweredMove and LoweredZero by using LXVD2X and STXVD2X to move 16 bytes at a time. These instructions are now used if the size to be moved or zeroed is >= 64. These same instructions have already been used in the asm implementations for memmove and memclr. Some examples where this shows an improvement on power8: MakeSlice/Byte 27.3ns ± 1% 25.2ns ± 0% -7.69% MakeSlice/Int16 40.2ns ± 0% 35.2ns ± 0% -12.39% MakeSlice/Int 94.9ns ± 1% 77.9ns ± 0% -17.92% MakeSlice/Ptr 129ns ± 1% 103ns ± 0% -20.16% MakeSlice/Struct/24 176ns ± 1% 131ns ± 0% -25.67% MakeSlice/Struct/32 200ns ± 1% 142ns ± 0% -29.09% MakeSlice/Struct/40 220ns ± 2% 156ns ± 0% -28.82% GrowSlice/Byte 81.4ns ± 0% 73.4ns ± 0% -9.88% GrowSlice/Int16 118ns ± 1% 98ns ± 0% -17.03% GrowSlice/Int 178ns ± 1% 134ns ± 1% -24.65% GrowSlice/Ptr 249ns ± 4% 212ns ± 0% -14.94% GrowSlice/Struct/24 294ns ± 5% 215ns ± 0% -27.08% GrowSlice/Struct/32 315ns ± 1% 248ns ± 0% -21.49% GrowSlice/Struct/40 382ns ± 4% 289ns ± 1% -24.38% ExtendSlice/IntSlice 109ns ± 1% 90ns ± 1% -17.51% ExtendSlice/PointerSlice 142ns ± 2% 118ns ± 0% -16.75% ExtendSlice/NoGrow 6.02ns ± 0% 5.88ns ± 0% -2.33% Append 27.2ns ± 0% 27.6ns ± 0% +1.38% AppendGrowByte 4.20ms ± 3% 2.60ms ± 0% -38.18% AppendGrowString 134ms ± 3% 102ms ± 2% -23.62% AppendSlice/1Bytes 5.65ns ± 0% 5.67ns ± 0% +0.35% AppendSlice/4Bytes 6.40ns ± 0% 6.55ns ± 0% +2.34% AppendSlice/7Bytes 8.74ns ± 0% 8.84ns ± 0% +1.14% AppendSlice/8Bytes 5.68ns ± 0% 5.70ns ± 0% +0.40% AppendSlice/15Bytes 9.31ns ± 0% 9.39ns ± 0% +0.86% AppendSlice/16Bytes 14.0ns ± 0% 5.8ns ± 0% -58.32% AppendSlice/32Bytes 5.72ns ± 0% 5.68ns ± 0% -0.66% AppendSliceLarge/1024Bytes 918ns ± 8% 615ns ± 1% -33.00% AppendSliceLarge/4096Bytes 3.25µs ± 1% 1.92µs ± 1% -40.84% AppendSliceLarge/16384Bytes 8.70µs ± 2% 4.69µs ± 0% -46.08% AppendSliceLarge/65536Bytes 18.1µs ± 3% 7.9µs ± 0% -56.30% AppendSliceLarge/262144Bytes 69.8µs ± 2% 25.9µs ± 0% -62.91% AppendSliceLarge/1048576Bytes 258µs ± 1% 93µs ± 0% -63.96% Change-Id: I21625dbe231a2029ddb9f7d73f5a6417b35c1e49 Reviewed-on: https://go-review.googlesource.com/c/go/+/199639 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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