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[dev.ssa] cmd/compile: schedule phi control values first

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Change-Id: I684440dc316625d5572cc12179adbc206e306429
Reviewed-on: https://go-review.googlesource.com/13263
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-08-05 16:07:13 -07:00
parent cd0cb0a9d6
commit f1401f1a10
1 changed files with 4 additions and 3 deletions
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7
src/cmd/compile/internal/ssa/schedule.go
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@ -15,7 +15,7 @@ func schedule(f *Func) {
uses := make([]int, f.NumValues())
// "priority" for a value
score := make([]int, f.NumValues())
score := make([]uint8, f.NumValues())
// scheduling order. We queue values in this list in reverse order.
var order []*Value
@ -57,8 +57,9 @@ func schedule(f *Func) {
score[v.ID] = 1
}
}
if b.Control != nil {
// Force the control value to be scheduled at the end.
if b.Control != nil && b.Control.Op != OpPhi {
// Force the control value to be scheduled at the end,
// unless it is a phi value (which must be first).
score[b.Control.ID] = 3
// TODO: some times control values are used by other values
// in the block. So the control value will not appear at