c81dfdd47a
Since recent ARM CPUs support CRC late forwarding of results from a producer to a consumer, the second CRC instruction can be executed before the first CRC instruction complete. By loading 16 bytes once with LDP and ordering two CRC instructions here we can make the data forwarding happen to get better performance. Benchmarks old ThisRun delta CRC32/poly=IEEE/size=15/align=0-160 1.24GB/s 1.26GB/s +1.92% CRC32/poly=IEEE/size=15/align=1-160 1.24GB/s 1.26GB/s +1.92% CRC32/poly=IEEE/size=40/align=0-160 2.89GB/s 2.87GB/s -0.72% CRC32/poly=IEEE/size=40/align=1-160 2.86GB/s 2.87GB/s ~ CRC32/poly=IEEE/size=512/align=0-160 9.29GB/s 14.47GB/s +55.69% CRC32/poly=IEEE/size=512/align=1-160 9.26GB/s 13.88GB/s +49.89% CRC32/poly=IEEE/size=1kB/align=0-160 10.2GB/s 17.6GB/s +72.97% CRC32/poly=IEEE/size=1kB/align=1-160 10.1GB/s 17.2GB/s +69.29% CRC32/poly=IEEE/size=4kB/align=0-160 10.5GB/s 20.9GB/s +99.01% CRC32/poly=IEEE/size=4kB/align=1-160 10.5GB/s 20.5GB/s +95.02% CRC32/poly=IEEE/size=32kB/align=0-160 11.1GB/s 22.0GB/s +98.40% CRC32/poly=IEEE/size=32kB/align=1-160 11.1GB/s 21.6GB/s +94.80% CRC32/poly=Castagnoli/size=15/align=0-160 1.26GB/s 1.26GB/s ~ CRC32/poly=Castagnoli/size=15/align=1-160 1.25GB/s 1.26GB/s ~ CRC32/poly=Castagnoli/size=40/align=0-160 2.88GB/s 3.02GB/s +5.18% CRC32/poly=Castagnoli/size=40/align=1-160 2.85GB/s 3.01GB/s +5.57% CRC32/poly=Castagnoli/size=512/align=0-160 9.24GB/s 14.71GB/s +59.29% CRC32/poly=Castagnoli/size=512/align=1-160 9.21GB/s 13.45GB/s +45.92% CRC32/poly=Castagnoli/size=1kB/align=0-160 10.1GB/s 17.8GB/s +75.81% CRC32/poly=Castagnoli/size=1kB/align=1-160 10.1GB/s 17.0GB/s +67.80% CRC32/poly=Castagnoli/size=4kB/align=0-160 10.5GB/s 21.0GB/s +99.67% CRC32/poly=Castagnoli/size=4kB/align=1-160 10.5GB/s 20.5GB/s +94.26% CRC32/poly=Castagnoli/size=32kB/align=0-160 11.1GB/s 22.0GB/s +98.39% CRC32/poly=Castagnoli/size=32kB/align=1-160 11.1GB/s 21.7GB/s +95.63% Change-Id: Ifc7be5048cafac242e7b75f652e4aafa9aeae844 Reviewed-on: https://go-review.googlesource.com/c/go/+/407854 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Eric Fang <eric.fang@arm.com> Reviewed-by: Keith Randall <khr@golang.org> |
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