1 files changed, 29 insertions, 0 deletions
diff --git a/libgo/go/regexp/exec_test.go b/libgo/go/regexp/exec_test.go
index 766394de6ee..5f8e747b17b 100644
--- a/libgo/go/regexp/exec_test.go
+++ b/libgo/go/regexp/exec_test.go
@@ -681,6 +681,35 @@ func BenchmarkMatch(b *testing.B) {
 	}
 }
 
+func BenchmarkMatch_onepass_regex(b *testing.B) {
+	isRaceBuilder := strings.HasSuffix(testenv.Builder(), "-race")
+	r := MustCompile(`(?s)\A.*\z`)
+	if r.get().op == notOnePass {
+		b.Fatalf("want onepass regex, but %q is not onepass", r)
+	}
+	for _, size := range benchSizes {
+		if isRaceBuilder && size.n > 1<<10 {
+			continue
+		}
+		t := makeText(size.n)
+		bs := make([][]byte, len(t))
+		for i, s := range t {
+			bs[i] = []byte{s}
+		}
+		b.Run(size.name, func(b *testing.B) {
+			b.SetBytes(int64(size.n))
+			b.ReportAllocs()
+			for i := 0; i < b.N; i++ {
+				for _, byts := range bs {
+					if !r.Match(byts) {
+						b.Fatal("not match!")
+					}
+				}
+			}
+		})
+	}
+}
+
 var benchData = []struct{ name, re string }{
 	{"Easy0", "ABCDEFGHIJKLMNOPQRSTUVWXYZ$"},
 	{"Easy0i", "(?i)ABCDEFGHIJklmnopqrstuvwxyz$"},