Adding upstream version 1.20.14.upstream/1.20.14upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/src/cmd/compile/internal/test/issue53888_test.go b/src/cmd/compile/internal/test/issue53888_test.go
new file mode 100644
index 0000000..0d5b13b
--- /dev/null
+++ b/src/cmd/compile/internal/test/issue53888_test.go
@@ -0,0 +1,46 @@
+// Copyright 2022 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.
+
+//go:build !race
+
+package test
+
+import (
+	"internal/testenv"
+	"testing"
+)
+
+func TestAppendOfMake(t *testing.T) {
+	testenv.SkipIfOptimizationOff(t)
+	for n := 32; n < 33; n++ { // avoid stack allocation of make()
+		b := make([]byte, n)
+		f := func() {
+			b = append(b[:0], make([]byte, n)...)
+		}
+		if n := testing.AllocsPerRun(10, f); n > 0 {
+			t.Errorf("got %f allocs, want 0", n)
+		}
+		type S []byte
+
+		s := make(S, n)
+		g := func() {
+			s = append(s[:0], make(S, n)...)
+		}
+		if n := testing.AllocsPerRun(10, g); n > 0 {
+			t.Errorf("got %f allocs, want 0", n)
+		}
+		h := func() {
+			s = append(s[:0], make([]byte, n)...)
+		}
+		if n := testing.AllocsPerRun(10, h); n > 0 {
+			t.Errorf("got %f allocs, want 0", n)
+		}
+		i := func() {
+			b = append(b[:0], make(S, n)...)
+		}
+		if n := testing.AllocsPerRun(10, i); n > 0 {
+			t.Errorf("got %f allocs, want 0", n)
+		}
+	}
+}