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[dev.ssa] cmd/compile: schedule phi control values first
Change-Id: I684440dc316625d5572cc12179adbc206e306429 Reviewed-on: https://go-review.googlesource.com/13263 Reviewed-by: Keith Randall <khr@golang.org>
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@ -15,7 +15,7 @@ func schedule(f *Func) {
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uses := make([]int, f.NumValues())
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// "priority" for a value
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score := make([]int, f.NumValues())
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score := make([]uint8, f.NumValues())
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// scheduling order. We queue values in this list in reverse order.
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var order []*Value
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@ -57,8 +57,9 @@ func schedule(f *Func) {
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score[v.ID] = 1
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}
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}
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if b.Control != nil {
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// Force the control value to be scheduled at the end.
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if b.Control != nil && b.Control.Op != OpPhi {
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// Force the control value to be scheduled at the end,
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// unless it is a phi value (which must be first).
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score[b.Control.ID] = 3
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// TODO: some times control values are used by other values
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// in the block. So the control value will not appear at
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