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| author | David Chase <drchase@google.com> | 2016-03-17 16:14:41 -0400 |
|---|---|---|
| committer | David Chase <drchase@google.com> | 2016-03-17 20:55:13 +0000 |
| commit | 3a17fdaba037aa0fac9ee06f2cd8636ba61182d0 (patch) | |
| tree | b2e17b49617c037359fc2df7c29908a9793976f6 /src/cmd/compile/internal/ssa/critical.go | |
| parent | ebd9f1bd4c39bc2fe3bcf6f0d3c81f70dae495d8 (diff) | |
| download | go-3a17fdaba037aa0fac9ee06f2cd8636ba61182d0.tar.gz go-3a17fdaba037aa0fac9ee06f2cd8636ba61182d0.zip | |
cmd/compile: correct maintain use count when phi args merge
The critical phase did not correctly maintain the use count
when two predecessors of a new critical block transmit the
same value.
Change-Id: Iba802c98ebb84e36a410721ec32c867140efb6d4
Reviewed-on: https://go-review.googlesource.com/20822
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Todd Neal <todd@tneal.org>
Diffstat (limited to 'src/cmd/compile/internal/ssa/critical.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/critical.go | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/critical.go b/src/cmd/compile/internal/ssa/critical.go index b414913f94..38d4ca40dd 100644 --- a/src/cmd/compile/internal/ssa/critical.go +++ b/src/cmd/compile/internal/ssa/critical.go @@ -79,6 +79,7 @@ func critical(f *Func) { if reusedBlock { d.Preds = append(d.Preds, c) b.Preds[i] = nil + phi.Args[i].Uses-- phi.Args[i] = nil } else { // splice it in |