1 files changed, 62 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/test/intrinsics_test.go b/src/cmd/compile/internal/test/intrinsics_test.go
new file mode 100644
index 0000000..b89198c
--- /dev/null
+++ b/src/cmd/compile/internal/test/intrinsics_test.go
@@ -0,0 +1,62 @@
+// 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.
+
+package test
+
+import (
+	"math/bits"
+	"testing"
+)
+
+func TestBitLen64(t *testing.T) {
+	for i := 0; i <= 64; i++ {
+		got := bits.Len64(1 << i)
+		want := i + 1
+		if want == 65 {
+			want = 0
+		}
+		if got != want {
+			t.Errorf("Len64(1<<%d) = %d, want %d", i, got, want)
+		}
+	}
+}
+
+func TestBitLen32(t *testing.T) {
+	for i := 0; i <= 32; i++ {
+		got := bits.Len32(1 << i)
+		want := i + 1
+		if want == 33 {
+			want = 0
+		}
+		if got != want {
+			t.Errorf("Len32(1<<%d) = %d, want %d", i, got, want)
+		}
+	}
+}
+
+func TestBitLen16(t *testing.T) {
+	for i := 0; i <= 16; i++ {
+		got := bits.Len16(1 << i)
+		want := i + 1
+		if want == 17 {
+			want = 0
+		}
+		if got != want {
+			t.Errorf("Len16(1<<%d) = %d, want %d", i, got, want)
+		}
+	}
+}
+
+func TestBitLen8(t *testing.T) {
+	for i := 0; i <= 8; i++ {
+		got := bits.Len8(1 << i)
+		want := i + 1
+		if want == 9 {
+			want = 0
+		}
+		if got != want {
+			t.Errorf("Len8(1<<%d) = %d, want %d", i, got, want)
+		}
+	}
+}