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[dev.regabi] cmd/compile: improve walkReturn common case

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Instead of evaluating all result expressions up front and then
assigning them to their result destinations, we can interleave
evaluation with assignment. This reduces how much temporary
stack/register space is needed to hold the values in flight.

Doesn't pass toolstash -cmp, because it allows better return statement
code to be generated. E.g., cmd/go's text segment on linux/ppc64le
shrinks another 1kB.

Change-Id: I3fe889342c80e947e0118704ec01f1682c577e6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/281153
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This commit is contained in:
Matthew Dempsky 2021-01-02 23:56:20 -08:00
parent a317067d65
commit d36a6bf44d
1 changed files with 2 additions and 3 deletions
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5
src/cmd/compile/internal/walk/assign.go
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@ -253,10 +253,9 @@ func walkReturn(n *ir.ReturnStmt) ir.Node {
// Common case: Assignment order doesn't matter. Simply assign to
// each result parameter in order.
walkExprList(n.Results, n.PtrInit())
res := make([]ir.Node, len(results))
var res ir.Nodes
for i, v := range n.Results {
res[i] = convas(ir.NewAssignStmt(base.Pos, dsts[i], v), n.PtrInit())
appendWalkStmt(&res, convas(ir.NewAssignStmt(base.Pos, dsts[i], v), &res))
}
n.Results = res
return n