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| author | Keith Randall <khr@golang.org> | 2016-09-16 13:50:18 -0700 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2016-09-19 16:00:13 +0000 |
| commit | 75ce89c20dab10857ab0b5102001b34767c45b6e (patch) | |
| tree | b6d0086e53b0187137ca606d54e10d799d7f2761 /src/cmd/compile/internal/ssa/block.go | |
| parent | 2679282da4e437ee086ec791ab73181c39ae3463 (diff) | |
| download | go-75ce89c20dab10857ab0b5102001b34767c45b6e.tar.gz go-75ce89c20dab10857ab0b5102001b34767c45b6e.zip | |
cmd/compile: cache CFG-dependent computations
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>
Diffstat (limited to 'src/cmd/compile/internal/ssa/block.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/block.go | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/block.go b/src/cmd/compile/internal/ssa/block.go index 49c1304057..b5bedd3912 100644 --- a/src/cmd/compile/internal/ssa/block.go +++ b/src/cmd/compile/internal/ssa/block.go @@ -144,6 +144,7 @@ func (b *Block) AddEdgeTo(c *Block) { j := len(c.Preds) b.Succs = append(b.Succs, Edge{c, j}) c.Preds = append(c.Preds, Edge{b, i}) + b.Func.invalidateCFG() } // removePred removes the ith input edge from b. @@ -159,6 +160,7 @@ func (b *Block) removePred(i int) { } b.Preds[n] = Edge{} b.Preds = b.Preds[:n] + b.Func.invalidateCFG() } // removeSucc removes the ith output edge from b. @@ -174,6 +176,7 @@ func (b *Block) removeSucc(i int) { } b.Succs[n] = Edge{} b.Succs = b.Succs[:n] + b.Func.invalidateCFG() } func (b *Block) swapSuccessors() { |