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| author | erifan01 <eric.fang@arm.com> | 2019-03-20 12:46:20 +0000 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2019-04-22 14:40:20 +0000 |
| commit | f8f265b9cfd57970b2bc8b3dd8531cedaf57ccc1 (patch) | |
| tree | 4c6bd812e0cddace3c11512e5b27013f9102b7f7 /src/encoding | |
| parent | db42bb3b70fe82e9d33011fb36b4171897663ccf (diff) | |
| download | go-f8f265b9cfd57970b2bc8b3dd8531cedaf57ccc1.tar.xz | |
cmd/compile: intrinsify math/bits.Sub64 for arm64
This CL instrinsifies Sub64 with arm64 instruction sequence NEGS, SBCS,
NGC and NEG, and optimzes the case of borrowing chains.
Benchmarks:
name old time/op new time/op delta
Sub-64 2.500000ns +- 0% 2.048000ns +- 1% -18.08% (p=0.000 n=10+10)
Sub32-64 2.500000ns +- 0% 2.500000ns +- 0% ~ (all equal)
Sub64-64 2.500000ns +- 0% 2.080000ns +- 0% -16.80% (p=0.000 n=10+7)
Sub64multiple-64 7.090000ns +- 0% 2.090000ns +- 0% -70.52% (p=0.000 n=10+10)
Change-Id: I3d2664e009a9635e13b55d2c4567c7b34c2c0655
Reviewed-on: https://go-review.googlesource.com/c/go/+/159018
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/encoding')
0 files changed, 0 insertions, 0 deletions