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cmd/compile: reset branch prediction when deleting a branch

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When we go from a branch block to a plain block, reset the
branch prediction bit. Downstream passes asssume that if the
branch prediction is set, then the block has 2 successors.

Fixes #23504

Change-Id: I2898ec002228b2e34fe80ce420c6939201c0a5aa
Reviewed-on: https://go-review.googlesource.com/88955
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Keith Randall 2018-01-22 09:43:27 -08:00 • committed by Keith Randall
parent 252ee90971
commit 4313d7767d
3 changed files with 17 additions and 1 deletions
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1
src/cmd/compile/internal/ssa/fuse.go
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@ -92,6 +92,7 @@ func fuseBlockIf(b *Block) bool {
b.removeEdge(1)
}
b.Kind = BlockPlain
b.Likely = BranchUnknown
b.SetControl(nil)
// Trash the empty blocks s0 & s1.