1 files changed, 102 insertions, 0 deletions
diff --git a/src/net/netip/inlining_test.go b/src/net/netip/inlining_test.go
new file mode 100644
index 0000000..b521eee
--- /dev/null
+++ b/src/net/netip/inlining_test.go
@@ -0,0 +1,102 @@
+// Copyright 2020 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 netip
+
+import (
+	"internal/testenv"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+func TestInlining(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+	t.Parallel()
+	out, err := exec.Command(
+		testenv.GoToolPath(t),
+		"build",
+		"--gcflags=-m",
+		"net/netip").CombinedOutput()
+	if err != nil {
+		t.Fatalf("go build: %v, %s", err, out)
+	}
+	got := map[string]bool{}
+	regexp.MustCompile(` can inline (\S+)`).ReplaceAllFunc(out, func(match []byte) []byte {
+		got[strings.TrimPrefix(string(match), " can inline ")] = true
+		return nil
+	})
+	wantInlinable := []string{
+		"(*uint128).halves",
+		"Addr.BitLen",
+		"Addr.hasZone",
+		"Addr.Is4",
+		"Addr.Is4In6",
+		"Addr.Is6",
+		"Addr.IsLoopback",
+		"Addr.IsMulticast",
+		"Addr.IsInterfaceLocalMulticast",
+		"Addr.IsValid",
+		"Addr.IsUnspecified",
+		"Addr.Less",
+		"Addr.Unmap",
+		"Addr.Zone",
+		"Addr.v4",
+		"Addr.v6",
+		"Addr.v6u16",
+		"Addr.withoutZone",
+		"AddrPortFrom",
+		"AddrPort.Addr",
+		"AddrPort.Port",
+		"AddrPort.IsValid",
+		"Prefix.IsSingleIP",
+		"Prefix.Masked",
+		"Prefix.IsValid",
+		"PrefixFrom",
+		"Prefix.Addr",
+		"Prefix.Bits",
+		"AddrFrom4",
+		"IPv6LinkLocalAllNodes",
+		"IPv6Unspecified",
+		"MustParseAddr",
+		"MustParseAddrPort",
+		"MustParsePrefix",
+		"appendDecimal",
+		"appendHex",
+		"uint128.addOne",
+		"uint128.and",
+		"uint128.bitsClearedFrom",
+		"uint128.bitsSetFrom",
+		"uint128.isZero",
+		"uint128.not",
+		"uint128.or",
+		"uint128.subOne",
+		"uint128.xor",
+	}
+	switch runtime.GOARCH {
+	case "amd64", "arm64":
+		// These don't inline on 32-bit.
+		wantInlinable = append(wantInlinable,
+			"Addr.Next",
+			"Addr.Prev",
+		)
+	}
+
+	for _, want := range wantInlinable {
+		if !got[want] {
+			t.Errorf("%q is no longer inlinable", want)
+			continue
+		}
+		delete(got, want)
+	}
+	for sym := range got {
+		if strings.Contains(sym, ".func") {
+			continue
+		}
+		t.Logf("not in expected set, but also inlinable: %q", sym)
+
+	}
+}