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go / go / 8448d3aace7f26bd6eca14e8b89c5a981c2ab9d3
commit8448d3aace7f26bd6eca14e8b89c5a981c2ab9d3[log] [tgz]
authorAlexandru Moșoi <brtzsnr@gmail.com>Tue Apr 05 23:32:49 2016 +0200
committerAlexandru Moșoi <alexandru@mosoi.ro>Thu Apr 07 13:28:13 2016 +0000
tree1a01cc1444c82e3e66cd194cefca29b7e02a2471
parent121c434f7add815c3147b01a097a8998018bcc6b [diff]
cmd/compile: fold CMPconst and SHR

Fold the comparison when the SHR result is small.

Useful for:
- murmur mix like hashing where higher bits are desirable, i.e. hash = uint32(i * C) >> 18
- integer log2 via DeBruijn sequence: http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogDeBruijn

Change-Id: If70ae18cb86f4cc83ab6213f88ced03cc4986156
Reviewed-on: https://go-review.googlesource.com/21514
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
3 files changed
tree: 1a01cc1444c82e3e66cd194cefca29b7e02a2471
  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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