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| author | Josh Bleecher Snyder <josharian@gmail.com> | 2015-08-11 17:28:56 -0700 |
|---|---|---|
| committer | Josh Bleecher Snyder <josharian@gmail.com> | 2015-08-12 22:03:08 +0000 |
| commit | bbf8c5ce2ffc7085bc63e2edf0117adaccada53e (patch) | |
| tree | 9115daa4dfe86c54975d8b54f5fe58a768fa0afa /src/cmd/compile/internal/ssa/layout.go | |
| parent | 212a1763fc7d0cf17ae9e27680dcb3e346d1c71b (diff) | |
| download | go-bbf8c5ce2ffc7085bc63e2edf0117adaccada53e.tar.gz go-bbf8c5ce2ffc7085bc63e2edf0117adaccada53e.zip | |
[dev.ssa] cmd/compile: initial implementation of likely direction
Change-Id: Id8457b18c07bf717d13c9423d8f314f253eee64f
Reviewed-on: https://go-review.googlesource.com/13580
Reviewed-by: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/cmd/compile/internal/ssa/layout.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/layout.go | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/ssa/layout.go b/src/cmd/compile/internal/ssa/layout.go index c2d72267b1..7e865f948e 100644 --- a/src/cmd/compile/internal/ssa/layout.go +++ b/src/cmd/compile/internal/ssa/layout.go @@ -47,7 +47,21 @@ blockloop: // Pick the next block to schedule // Pick among the successor blocks that have not been scheduled yet. - // Just use degree for now. TODO(khr): use likely direction hints. + + // Use likely direction if we have it. + var likely *Block + switch b.Likely { + case BranchLikely: + likely = b.Succs[0] + case BranchUnlikely: + likely = b.Succs[1] + } + if likely != nil && !scheduled[likely.ID] { + bid = likely.ID + continue + } + + // Use degree for now. bid = 0 mindegree := f.NumBlocks() for _, c := range order[len(order)-1].Succs { |