c4807d4cc7
This change improves the performance of memmove on ppc64 & ppc64le mainly for moves >=32 bytes. In addition, the test to detect backward moves was enhanced to avoid backward moves if source and dest were in different types of storage, since backward moves might not always be efficient. Fixes #14507 The following shows some of the improvements from the test in the runtime package: BenchmarkMemmove32 4229.56 4717.13 1.12x BenchmarkMemmove64 6156.03 7810.42 1.27x BenchmarkMemmove128 7521.69 12468.54 1.66x BenchmarkMemmove256 6729.90 18260.33 2.71x BenchmarkMemmove512 8521.59 18033.81 2.12x BenchmarkMemmove1024 9760.92 25762.61 2.64x BenchmarkMemmove2048 10241.00 29584.94 2.89x BenchmarkMemmove4096 10399.37 31882.31 3.07x BenchmarkMemmoveUnalignedDst16 1943.69 2258.33 1.16x BenchmarkMemmoveUnalignedDst32 3885.08 3965.81 1.02x BenchmarkMemmoveUnalignedDst64 5121.63 6965.54 1.36x BenchmarkMemmoveUnalignedDst128 7212.34 11372.68 1.58x BenchmarkMemmoveUnalignedDst256 6564.52 16913.59 2.58x BenchmarkMemmoveUnalignedDst512 8364.35 17782.57 2.13x BenchmarkMemmoveUnalignedDst1024 9539.87 24914.72 2.61x BenchmarkMemmoveUnalignedDst2048 9199.23 21235.11 2.31x BenchmarkMemmoveUnalignedDst4096 10077.39 25231.99 2.50x BenchmarkMemmoveUnalignedSrc32 3249.83 3742.52 1.15x BenchmarkMemmoveUnalignedSrc64 5562.35 6627.96 1.19x BenchmarkMemmoveUnalignedSrc128 6023.98 10200.84 1.69x BenchmarkMemmoveUnalignedSrc256 6921.83 15258.43 2.20x BenchmarkMemmoveUnalignedSrc512 8593.13 16541.97 1.93x BenchmarkMemmoveUnalignedSrc1024 9730.95 22927.84 2.36x BenchmarkMemmoveUnalignedSrc2048 9793.28 21537.73 2.20x BenchmarkMemmoveUnalignedSrc4096 10132.96 26295.06 2.60x Change-Id: I73af59970d4c97c728deabb9708b31ec7e01bdf2 Reviewed-on: https://go-review.googlesource.com/21990 Reviewed-by: Bill O'Farrell <billotosyr@gmail.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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