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cmd/compile: move writebarrier pass after dse

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This avoids generating writeBarrier.enabled
blocks for dead stores.

Change-Id: Ib11d8e2ba952f3f1f01d16776e40a7200a7683cf
Reviewed-on: https://go-review.googlesource.com/42012
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Josh Bleecher Snyder 2017-04-27 13:15:24 -07:00
parent cf1b323fc8
commit e5c9358fe2
2 changed files with 26 additions and 15 deletions
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2
src/cmd/compile/internal/ssa/compile.go
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@ -348,9 +348,9 @@ var passes = [...]pass{
{name: "late opt", fn: opt, required: true}, // TODO: split required rules and optimizing rules
{name: "generic deadcode", fn: deadcode},
{name: "check bce", fn: checkbce},
{name: "writebarrier", fn: writebarrier, required: true}, // expand write barrier ops
{name: "fuse", fn: fuse},
{name: "dse", fn: dse},
{name: "writebarrier", fn: writebarrier, required: true}, // expand write barrier ops
{name: "insert resched checks", fn: insertLoopReschedChecks,
disabled: objabi.Preemptibleloops_enabled == 0}, // insert resched checks in loops.
{name: "tighten", fn: tighten}, // move values closer to their uses