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cmd/compile: guard against invalid phis in shortcircuit

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In the review of CL 222923, Keith expressed concern
that we could end up with invalid phis.

We have some code to handle this, but on further reflection,
I think it might not handle some cases in which phis get moved.

I can't create a failing case, but guard against it nevertheless.

Change-Id: Ib3a07ac1d36a674c72dcb9cc9261ccfcb716b5a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/227697
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2020-03-11 14:49:37 -07:00
parent b78109e80e
commit 64dcef3045
1 changed files with 5 additions and 1 deletions
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6
src/cmd/compile/internal/ssa/shortcircuit.go
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@ -237,7 +237,11 @@ func shortcircuitBlock(b *Block) bool {
}
}
}
phielimValue(phi)
if phi.Uses != 0 {
phielimValue(phi)
} else {
phi.reset(OpInvalid)
}
i-- // v.moveTo put a new value at index i; reprocess
}