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cmd/compile: make nilcheck more careful about statement relocations

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The earlier code was picking nodes that were "poor choices" and
thus sometimes losing statements altogether.

Change-Id: Ibe5ed800ffbd3c926c0ab1bc10c77d72d3042e45
Reviewed-on: https://go-review.googlesource.com/c/go/+/198478
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
David Chase 2019-09-30 11:10:36 -04:00
parent 53bd915109
commit 08a87938bb
1 changed files with 9 additions and 1 deletions
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10
src/cmd/compile/internal/ssa/nilcheck.go
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@ -153,12 +153,20 @@ func nilcheckelim(f *Func) {
work = append(work, bp{op: ClearPtr, ptr: ptr})
fallthrough // a non-eliminated nil check might be a good place for a statement boundary.
default:
if pendingLines.contains(v.Pos) && v.Pos.IsStmt() != src.PosNotStmt {
if v.Pos.IsStmt() != src.PosNotStmt && !isPoorStatementOp(v.Op) && pendingLines.contains(v.Pos) {
v.Pos = v.Pos.WithIsStmt()
pendingLines.remove(v.Pos)
}
}
}
// This reduces the lost statement count in "go" by 5 (out of 500 total).
for j := 0; j < i; j++ { // is this an ordering problem?
v := b.Values[j]
if v.Pos.IsStmt() != src.PosNotStmt && !isPoorStatementOp(v.Op) && pendingLines.contains(v.Pos) {
v.Pos = v.Pos.WithIsStmt()
pendingLines.remove(v.Pos)
}
}
if pendingLines.contains(b.Pos) {
b.Pos = b.Pos.WithIsStmt()
pendingLines.remove(b.Pos)