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[dev.ssa] cmd/compile: use sparsetree in checkFunc

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Modify the simple domCheck to use the sparse tree code.  This
speeds up compilation of one of the generated test cases from
1m48s to 17s.

Change-Id: If577410ee77b54918147a66917a8e3721297ee0a
Reviewed-on: https://go-review.googlesource.com/19187
Run-TryBot: Todd Neal <todd@tneal.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Todd Neal 2016-02-03 21:06:21 -05:00
parent 955749c45f
commit c58c20f30f
1 changed files with 6 additions and 13 deletions
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19
src/cmd/compile/internal/ssa/check.go
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@ -253,6 +253,7 @@ func checkFunc(f *Func) {
// Note: regalloc introduces non-dominating args.
// See TODO in regalloc.go.
idom := dominators(f)
sdom := newSparseTree(f, idom)
for _, b := range f.Blocks {
for _, v := range b.Values {
for i, arg := range v.Args {
@ -261,12 +262,12 @@ func checkFunc(f *Func) {
if v.Op == OpPhi {
y = b.Preds[i]
}
if !domCheck(f, idom, x, y) {
if !domCheck(f, sdom, x, y) {
f.Fatalf("arg %d of value %s does not dominate, arg=%s", i, v.LongString(), arg.LongString())
}
}
}
if b.Control != nil && !domCheck(f, idom, b.Control.Block, b) {
if b.Control != nil && !domCheck(f, sdom, b.Control.Block, b) {
f.Fatalf("control value %s for %s doesn't dominate", b.Control, b)
}
}
@ -274,18 +275,10 @@ func checkFunc(f *Func) {
}
// domCheck reports whether x dominates y (including x==y).
func domCheck(f *Func, idom []*Block, x, y *Block) bool {
if y != f.Entry && idom[y.ID] == nil {
func domCheck(f *Func, sdom sparseTree, x, y *Block) bool {
if !sdom.isAncestorEq(y, f.Entry) {
// unreachable - ignore
return true
}
for {
if x == y {
return true
}
y = idom[y.ID]
if y == nil {
return false
}
}
return sdom.isAncestorEq(x, y)
}