| commit | 846bc6c5ab396490717f8753cc3c271f9c1391e4 | [log] [tgz] |
|---|---|---|
| author | David Chase <drchase@google.com> | Wed Jul 20 10:44:49 2016 -0400 |
| committer | David Chase <drchase@google.com> | Thu Jul 21 16:09:45 2016 +0000 |
| tree | 493283a534c94b46c72e218f1fa521cbe698f8b3 | |
| parent | 305a0ac123cf99d469f5519f8974f4911e690c48 [diff] |
cmd/compile: change phi location to be optimistic at backedges This is: (1) a simple trick that cuts the number of phi-nodes (temporarily) inserted into the ssa representation by a factor of 10, and can cut the user time to compile tricky inputs like gogo/protobuf tests from 13 user minutes to 9.5, and memory allocation from 3.4GB to 2.4GB. (2) a fix to sparse lookup, that does not rely on an assumption proven false by at least one pathological input "etldlen". These two changes fix unrelated compiler performance bugs, both necessary to obtain good performance compiling etldlen. Without them it takes 20 minutes or longer, with them it completes in 2 minutes, without a gigantic memory footprint. Updates #16407 Change-Id: Iaa8aaa8c706858b3d49de1c4865a7fd79e6f4ff7 Reviewed-on: https://go-review.googlesource.com/23136 Reviewed-by: Keith Randall <khr@golang.org> Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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