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go / go / 9c99512d188b01557f5271b2c65d814487817920
commit9c99512d188b01557f5271b2c65d814487817920[log] [tgz]
authorIlya Tocar <ilya.tocar@intel.com>Fri Aug 18 14:03:33 2017 -0500
committerIlya Tocar <ilya.tocar@intel.com>Fri Aug 25 20:05:17 2017 +0000
tree466d7ccf0838cabf8a27c766ded30364b332d5ba
parentb40831b115e46e9de719bddccf2d27d7d4940756 [diff]
cmd/compile/internal/ssa: combine consecutive loads and stores on amd64

Sometimes (often for calls) we generate code like this:

MOVQ  (addr),AX
MOVQ  8(addr),BX
MOVQ  AX,(otheraddr)
MOVQ  BX,8(otheraddr)

Replace it with

MOVUPS (addr),X0
MOVUPS X0,(otheraddr)

For completeness do the same for 8,16,32-bit loads/stores too.
Shaves 1% from code sections of go tool.

/localdisk/itocar/golang/bin/go 10293917
go_old 10334877 [40960 bytes]

read-only data = 682 bytes (0.040769%)
global text (code) = 38961 bytes (1.036503%)
Total difference 39643 bytes (0.674628%)

Updates #6853

Change-Id: I1f0d2f60273a63a079b58927cd1c4e3429d2e7ae
Reviewed-on: https://go-review.googlesource.com/57130
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
3 files changed
tree: 466d7ccf0838cabf8a27c766ded30364b332d5ba
  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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