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cmd/compile: cache CFG-dependent computations

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We compute a lot of stuff based off the CFG: postorder traversal,
dominators, dominator tree, loop nest.  Multiple phases use this
information and we end up recomputing some of it.  Add a cache
for this information so if the CFG hasn't changed, we can reuse
the previous computation.

Change-Id: I9b5b58af06830bd120afbee9cfab395a0a2f74b2
Reviewed-on: https://go-review.googlesource.com/29356
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Keith Randall 2016-09-16 13:50:18 -07:00
parent 2679282da4
commit 75ce89c20d
18 changed files with 83 additions and 59 deletions
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2
src/cmd/compile/internal/ssa/passbm_test.go
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@ -35,7 +35,6 @@ func benchFnPass(b *testing.B, fn passFunc, size int, bg blockGen) {
b.ReportAllocs()
c := NewConfig("amd64", DummyFrontend{b}, nil, true)
fun := Fun(c, "entry", bg(size)...)
domTree(fun.f)
CheckFunc(fun.f)
b.ResetTimer()
for i := 0; i < b.N; i++ {
@ -51,7 +50,6 @@ func benchFnBlock(b *testing.B, fn passFunc, bg blockGen) {
b.ReportAllocs()
c := NewConfig("amd64", DummyFrontend{b}, nil, true)
fun := Fun(c, "entry", bg(b.N)...)
domTree(fun.f)
CheckFunc(fun.f)
b.ResetTimer()
for i := 0; i < passCount; i++ {