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go / go / f8f265b9cfd57970b2bc8b3dd8531cedaf57ccc1
commitf8f265b9cfd57970b2bc8b3dd8531cedaf57ccc1[log] [tgz]
authorerifan01 <eric.fang@arm.com>Wed Mar 20 12:46:20 2019 +0000
committerCherry Zhang <cherryyz@google.com>Mon Apr 22 14:40:20 2019 +0000
tree4c6bd812e0cddace3c11512e5b27013f9102b7f7
parentdb42bb3b70fe82e9d33011fb36b4171897663ccf [diff]
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>
7 files changed
tree: 4c6bd812e0cddace3c11512e5b27013f9102b7f7
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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