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runtime: check pointer equality in arm cmpbody
Updates golang#11336 Follow the lead of amd64 do a pointer equality check before comparing string/byte contents on arm. BenchmarkCompareBytesEqual-4 208 211 +1.44% BenchmarkCompareBytesToNil-4 83.6 81.8 -2.15% BenchmarkCompareBytesEmpty-4 80.2 75.2 -6.23% BenchmarkCompareBytesIdentical-4 208 75.2 -63.85% BenchmarkCompareBytesSameLength-4 126 128 +1.59% BenchmarkCompareBytesDifferentLength-4 128 130 +1.56% BenchmarkCompareBytesBigUnaligned-4 14192804 14060971 -0.93% BenchmarkCompareBytesBig-4 12277313 12128193 -1.21% BenchmarkCompareBytesBigIdentical-4 9385046 78.5 -100.00% Change-Id: I5b24620018688c5fe04b6ff6743a24c4ce225788 Reviewed-on: https://go-review.googlesource.com/13881 Reviewed-by: Keith Randall <[email protected]>
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