bdba55653f
This adds support for an alignment directive that can be used within Go asm to indicate preferred code alignment for ppc64x. This is intended to be used with loops to improve performance. This change only adds the directive and aligns the code based on it. Follow up changes will modify asm functions for ppc64x that benefit from preferred alignment. Fixes #14935 Here is one example of the improvement in memmove when the directive is used on the loops in the code: Memmove/64 8.74ns ± 0% 8.64ns ± 0% -1.19% (p=0.000 n=8+8) Memmove/128 11.5ns ± 0% 11.0ns ± 0% -4.35% (p=0.000 n=8+8) Memmove/256 23.0ns ± 0% 15.3ns ± 0% -33.48% (p=0.000 n=8+8) Memmove/512 31.7ns ± 0% 31.8ns ± 0% +0.32% (p=0.000 n=8+8) Memmove/1024 52.3ns ± 0% 43.9ns ± 0% -16.10% (p=0.000 n=8+8) Memmove/2048 93.2ns ± 0% 76.2ns ± 0% -18.24% (p=0.000 n=8+8) Memmove/4096 174ns ± 0% 141ns ± 0% -18.97% (p=0.000 n=8+8) Change-Id: I200d77e923dd5d78c22fe3f8eb142a8fbaff57bf Reviewed-on: https://go-review.googlesource.com/c/144218 Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com> |
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