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[dev.ssa] cmd/compile: minor CSE cleanup
Remove unnecessary local var split. Change-Id: I907ef682b5fd9b3a67771edd1fe90c558f8937ea Reviewed-on: https://go-review.googlesource.com/14523 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> Reviewed-by: Keith Randall <khr@golang.org>
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@ -92,20 +92,18 @@ func cse(f *Func) {
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// all values in this equiv class that are not equivalent to v get moved
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// all values in this equiv class that are not equivalent to v get moved
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// into another equiv class.
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// into another equiv class.
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// To avoid allocating while building that equivalence class,
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// To avoid allocating while building that equivalence class,
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// move the values equivalent to v to the beginning of e,
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// move the values equivalent to v to the beginning of e
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// other values to the end of e, and track where the split is.
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// and other values to the end of e.
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allvals := e
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allvals := e
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split := len(e)
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eqloop:
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eqloop:
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for j := 1; j < len(e); {
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for j := 1; j < len(e); {
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w := e[j]
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w := e[j]
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for i := 0; i < len(v.Args); i++ {
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for i := 0; i < len(v.Args); i++ {
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if valueEqClass[v.Args[i].ID] != valueEqClass[w.Args[i].ID] || !v.Type.Equal(w.Type) {
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if valueEqClass[v.Args[i].ID] != valueEqClass[w.Args[i].ID] || !v.Type.Equal(w.Type) {
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// w is not equivalent to v.
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// w is not equivalent to v.
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// move it to the end, shrink e, and move the split.
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// move it to the end and shrink e.
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e[j], e[len(e)-1] = e[len(e)-1], e[j]
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e[j], e[len(e)-1] = e[len(e)-1], e[j]
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e = e[:len(e)-1]
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e = e[:len(e)-1]
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split--
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valueEqClass[w.ID] = len(partition)
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valueEqClass[w.ID] = len(partition)
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changed = true
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changed = true
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continue eqloop
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continue eqloop
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@ -115,8 +113,8 @@ func cse(f *Func) {
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j++
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j++
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}
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}
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partition[i] = e
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partition[i] = e
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if split < len(allvals) {
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if len(e) < len(allvals) {
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partition = append(partition, allvals[split:])
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partition = append(partition, allvals[len(e):])
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}
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}
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}
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}
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