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[dev.regabi] go/constant: avoid heap allocations in match
When type switching from interface{} to T, and then returning the T as interface{} again, it's better to return the original interface{} value. This avoids needing to heap allocate the T for non-pointer-shaped types (i.e., int64Val, complexVal, stringVal). Change-Id: I25c83b3f9ec9bd2ffeec5a65279b68f4fcef8a19 Reviewed-on: https://go-review.googlesource.com/c/go/+/272647 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Robert Griesemer <gri@golang.org>
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@ -1023,52 +1023,55 @@ func match(x, y Value) (_, _ Value) {
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}
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// ord(x) <= ord(y)
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switch x := x.(type) {
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// Prefer to return the original x and y arguments when possible,
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// to avoid unnecessary heap allocations.
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switch x1 := x.(type) {
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case boolVal, *stringVal, complexVal:
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return x, y
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case int64Val:
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switch y := y.(type) {
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switch y.(type) {
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case int64Val:
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return x, y
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case intVal:
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return i64toi(x), y
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return i64toi(x1), y
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case ratVal:
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return i64tor(x), y
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return i64tor(x1), y
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case floatVal:
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return i64tof(x), y
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return i64tof(x1), y
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case complexVal:
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return vtoc(x), y
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return vtoc(x1), y
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}
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case intVal:
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switch y := y.(type) {
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switch y.(type) {
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case intVal:
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return x, y
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case ratVal:
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return itor(x), y
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return itor(x1), y
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case floatVal:
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return itof(x), y
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return itof(x1), y
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case complexVal:
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return vtoc(x), y
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return vtoc(x1), y
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}
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case ratVal:
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switch y := y.(type) {
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switch y.(type) {
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case ratVal:
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return x, y
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case floatVal:
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return rtof(x), y
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return rtof(x1), y
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case complexVal:
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return vtoc(x), y
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return vtoc(x1), y
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}
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case floatVal:
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switch y := y.(type) {
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switch y.(type) {
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case floatVal:
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return x, y
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case complexVal:
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return vtoc(x), y
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return vtoc(x1), y
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}
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}
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