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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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4
src/cmd/compile/internal/ssa/regalloc.go
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@ -2195,8 +2195,8 @@ func (s *regAllocState) computeLive() {
// Walk the dominator tree from end to beginning, just once, treating SCC
// components as single blocks, duplicated calculated liveness information
// out to all of them.
s.loopnest = loopnestfor(f)
po := s.loopnest.po
po := f.postorder()
s.loopnest = f.loopnest()
for {
changed := false