diff options
| -rw-r--r-- | src/cmd/compile/internal/ssa/fuse.go | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/ssa/fuse.go b/src/cmd/compile/internal/ssa/fuse.go index 94a96120fa..f00356a7b2 100644 --- a/src/cmd/compile/internal/ssa/fuse.go +++ b/src/cmd/compile/internal/ssa/fuse.go @@ -8,7 +8,9 @@ package ssa func fuse(f *Func) { for changed := true; changed; { changed = false - for _, b := range f.Blocks { + // Fuse from end to beginning, to avoid quadratic behavior in fuseBlockPlain. See issue 13554. + for i := len(f.Blocks) - 1; i >= 0; i-- { + b := f.Blocks[i] changed = fuseBlockIf(b) || changed changed = fuseBlockPlain(b) || changed } |