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Josh Bleecher Snyder 2a846d2bd3 [dev.ssa] cmd/compile/ssa: add nilcheckelim pass
The nilcheckelim pass eliminates unnecessary nil checks.
The initial implementation removes redundant nil checks.
See the comments in nilcheck.go for ideas for future
improvements.

The efficacy of the cse pass has a significant impact
on this efficacy of this pass.

There are 886 nil checks in the parts of the standard
library that SSA can currently compile (~20%).

This pass eliminates 75 (~8.5%) of them.

As a data point, with a more aggressive but unsound
cse pass that treats many more types as identical,
this pass eliminates 115 (~13%) of the nil checks.

Change-Id: I13e567a39f5f6909fc33434d55c17a7e3884a704
Reviewed-on: https://go-review.googlesource.com/11430
Reviewed-by: Alan Donovan <adonovan@google.com>
2015-06-24 19:56:51 +00:00
api api: refresh next.txt 2015-05-14 21:31:18 +00:00
doc all: fix misprints in comments 2015-06-11 14:18:57 +00:00
lib/time remove the obsolete lib/codereview. 2014-12-08 07:51:54 +00:00
misc misc/ios: document the external binary and the required env variables 2015-06-09 22:09:52 +00:00
src [dev.ssa] cmd/compile/ssa: add nilcheckelim pass 2015-06-24 19:56:51 +00:00
test cmd/compile: use generated temps in bool codegen 2015-06-09 17:38:26 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore y.output 2015-06-10 00:28:52 +00:00
AUTHORS A+C: add another email address for Emil Hessman 2014-11-12 10:01:23 -08:00
CONTRIBUTING.md doc: direct people to the mailing list 2015-01-18 21:27:07 +00:00
CONTRIBUTORS CONTRIBUTORS: add Burcu Dogan's personal mail 2015-05-06 16:06:42 +00:00
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The Go Programming Language

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