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cmd/compile: use shared dom tree for cse, too

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Missed this in the previous CL where the shared
dom tree was introduced.

Change-Id: If0bd85d4b4567d7e87814ed511603b1303ab3903
Reviewed-on: https://go-review.googlesource.com/21970
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Alexandru Moșoi 2016-04-13 10:58:38 +02:00 • committed by Alexandru Moșoi
parent 61b7a9c57b
commit e0611b1664
3 changed files with 7 additions and 7 deletions
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8
src/cmd/compile/internal/ssa/cse.go
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@ -131,9 +131,7 @@ func cse(f *Func) {
}
}
// Compute dominator tree
idom := dominators(f)
sdom := newSparseTree(f, idom)
// Dominator tree (f.sdom) is computed by the generic domtree pass.
// Compute substitutions we would like to do. We substitute v for w
// if v and w are in the same equivalence class and v dominates w.
@ -143,7 +141,7 @@ func cse(f *Func) {
// Find a maximal dominant element in e
v := e[0]
for _, w := range e[1:] {
if sdom.isAncestorEq(w.Block, v.Block) {
if f.sdom.isAncestorEq(w.Block, v.Block) {
v = w
}
}
@ -153,7 +151,7 @@ func cse(f *Func) {
w := e[i]
if w == v {
e, e[i] = e[:len(e)-1], e[len(e)-1]
} else if sdom.isAncestorEq(v.Block, w.Block) {
} else if f.sdom.isAncestorEq(v.Block, w.Block) {
rewrite[w.ID] = v
e, e[i] = e[:len(e)-1], e[len(e)-1]
} else {