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cmd/compile: move decompose builtin closer to late opt

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* Shaves about 10k from pkg/tools/linux_amd64.
* Was suggested by drchase before
* Found by looking at ssa output of #14758

Change-Id: If2c4ddf3b2603d4dfd8fb4d9199b9a3dcb05b17d
Reviewed-on: https://go-review.googlesource.com/20570
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Alexandru Moșoi 2016-03-11 01:10:35 +01:00 committed by Alexandru Moșoi
parent fdc04223c5
commit 8ec80176d4
1 changed files with 2 additions and 2 deletions
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4
src/cmd/compile/internal/ssa/compile.go
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@ -174,7 +174,6 @@ var passes = [...]pass{
{name: "early deadcode", fn: deadcode}, // remove generated dead code to avoid doing pointless work during opt
{name: "short circuit", fn: shortcircuit},
{name: "decompose user", fn: decomposeUser, required: true},
{name: "decompose builtin", fn: decomposeBuiltIn, required: true},
{name: "opt", fn: opt, required: true}, // TODO: split required rules and optimizing rules
{name: "zero arg cse", fn: zcse, required: true}, // required to merge OpSB values
{name: "opt deadcode", fn: deadcode}, // remove any blocks orphaned during opt
@ -182,6 +181,7 @@ var passes = [...]pass{
{name: "phiopt", fn: phiopt},
{name: "nilcheckelim", fn: nilcheckelim},
{name: "prove", fn: prove},
{name: "decompose builtin", fn: decomposeBuiltIn, required: true},
{name: "dec", fn: dec, required: true},
{name: "late opt", fn: opt}, // TODO: split required rules and optimizing rules
{name: "generic deadcode", fn: deadcode},
@ -234,7 +234,7 @@ var passOrder = [...]constraint{
{"generic deadcode", "tighten"},
{"generic cse", "tighten"},
// don't run optimization pass until we've decomposed builtin objects
{"decompose builtin", "opt"},
{"decompose builtin", "late opt"},
// don't layout blocks until critical edges have been removed
{"critical", "layout"},
// regalloc requires the removal of all critical edges