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-rw-r--r--src/cmd/compile/internal/ssa/copyelim.go11
-rw-r--r--test/fixedbugs/issue65808.go30
2 files changed, 41 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/copyelim.go b/src/cmd/compile/internal/ssa/copyelim.go
index 17f65127ee..17471e3b5f 100644
--- a/src/cmd/compile/internal/ssa/copyelim.go
+++ b/src/cmd/compile/internal/ssa/copyelim.go
@@ -11,6 +11,17 @@ func copyelim(f *Func) {
// of OpCopy) is a copy.
for _, b := range f.Blocks {
for _, v := range b.Values {
+
+ // This is an early place in SSA where all values are examined.
+ // Rewrite all 0-sized Go values to remove accessors, dereferences, loads, etc.
+ if t := v.Type; (t.IsStruct() || t.IsArray()) && t.Size() == 0 {
+ if t.IsStruct() {
+ v.reset(OpStructMake0)
+ } else {
+ v.reset(OpArrayMake0)
+ }
+ }
+
copyelimValue(v)
}
}
diff --git a/test/fixedbugs/issue65808.go b/test/fixedbugs/issue65808.go
new file mode 100644
index 0000000000..e6c4cf1ed0
--- /dev/null
+++ b/test/fixedbugs/issue65808.go
@@ -0,0 +1,30 @@
+// compile
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.package main
+
+package main
+
+type Stringer interface {
+ String() string
+}
+
+type (
+ stringer struct{}
+ stringers [2]stringer
+ foo struct {
+ stringers
+ }
+)
+
+func (stringer) String() string { return "" }
+func toString(s Stringer) string { return s.String() }
+
+func (v stringers) toStrings() []string {
+ return []string{toString(v[0]), toString(v[1])}
+}
+
+func main() {
+ _ = stringers{}
+}