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6317f92f6e
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Keith Randall 6317f92f6e cmd/compile: fix CSE with commutative ops 
CSE opportunities were being missed for commutative ops. We used to
order the args of commutative ops (by arg ID) once at the start of CSE.
But that may not be enough.

i1 = (Load ptr mem)
i2 = (Load ptr mem)
x1 = (Add i1 j)
x2 = (Add i2 j)

Equivalent commutative ops x1 and x2 may not get their args ordered in
the same way because because at the start of CSE, we don't know that
the i values will be CSEd. If x1 and x2 get opposite orders we won't
CSE them.

Instead, (re)order the args of commutative operations by their
equivalence class IDs each time we partition an equivalence class.

Change-Id: Ic609fa83b85299782a5e85bf93dc6023fccf4b0c
Reviewed-on: https://go-review.googlesource.com/33632
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Todd Neal <todd@tneal.org>
2017-02-02 17:45:43 +00:00
.github doc: improve issue template 2016-08-29 03:33:28 +00:00
api Revert "cmd/go: note when some Go files were ignored on no-Go-files errors" 2016-12-21 05:25:57 +00:00
doc doc: mention SHA-256 CBC suites are off by default 2017-02-01 21:29:24 +00:00
lib/time lib/time: update tzdata to 2016j 2017-01-05 01:00:53 +00:00
misc misc/cgo/testshared: remove unused flag.Parse() 2017-02-02 13:40:16 +00:00
src cmd/compile: fix CSE with commutative ops 2017-02-02 17:45:43 +00:00
test cmd/compile: fix CSE with commutative ops 2017-02-02 17:45:43 +00:00
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.gitignore .gitignore: fix attempt at rooted paths 2017-01-05 01:29:25 +00:00
AUTHORS A+C: automated update 2016-12-21 03:22:22 +00:00
CONTRIBUTING.md doc: update CONTRIBUTING.md a bit, mention proposal process 2017-01-06 23:19:01 +00:00
CONTRIBUTORS A+C: automated update 2016-12-21 03:22:22 +00:00
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README.md

The Go Programming Language

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