tree ea2621270aef20e068e2934f5734f8901bbe669d
parent f2cd9d3b518cfa0e287637dd02a895ce2b587f14
author Alan Donovan <adonovan@google.com> 1497536906 -0400
committer Alan Donovan <adonovan@google.com> 1497544603 +0000

go/ssa: opt: avoid an allocation

In the dom tree traversal, the final child of each node now
inherits the parent's renaming map, reducing garbage.

This reduces allocations by 1.4% and bytes allocated by 2.0% when
building SSA for the entire standard library.

Change-Id: Id19b6d6766b3e0bf32d1db1238eff8a42d11b242
Reviewed-on: https://go-review.googlesource.com/45833
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>