diff --git a/src/cmd/compile/internal/gc/ssa.go b/src/cmd/compile/internal/gc/ssa.go
index 956569b86f..c8fb013ad0 100644
--- a/src/cmd/compile/internal/gc/ssa.go
+++ b/src/cmd/compile/internal/gc/ssa.go
@@ -329,8 +329,8 @@ func buildssa(fn *Node, worker int) *ssa.Func {
 	s.f.Config = ssaConfig
 	s.f.Cache = &ssaCaches[worker]
 	s.f.Cache.Reset()
-	s.f.DebugTest = s.f.DebugHashMatch("GOSSAHASH", name)
 	s.f.Name = name
+	s.f.DebugTest = s.f.DebugHashMatch("GOSSAHASH")
 	s.f.PrintOrHtmlSSA = printssa
 	if fn.Func.Pragma&Nosplit != 0 {
 		s.f.NoSplit = true
@@ -6863,6 +6863,10 @@ func (e *ssafn) SetWBPos(pos src.XPos) {
 	e.curfn.Func.setWBPos(pos)
 }
 
+func (e *ssafn) MyImportPath() string {
+	return myimportpath
+}
+
 func (n *Node) Typ() *types.Type {
 	return n.Type
 }
diff --git a/src/cmd/compile/internal/ssa/config.go b/src/cmd/compile/internal/ssa/config.go
index fdff3bbdeb..4b2f06def1 100644
--- a/src/cmd/compile/internal/ssa/config.go
+++ b/src/cmd/compile/internal/ssa/config.go
@@ -173,6 +173,9 @@ type Frontend interface {
 	// SetWBPos indicates that a write barrier has been inserted
 	// in this function at position pos.
 	SetWBPos(pos src.XPos)
+
+	// MyImportPath provides the import name (roughly, the package) for the function being compiled.
+	MyImportPath() string
 }
 
 // interface used to hold a *gc.Node (a stack variable).
diff --git a/src/cmd/compile/internal/ssa/export_test.go b/src/cmd/compile/internal/ssa/export_test.go
index a94cce48a4..51665c60e2 100644
--- a/src/cmd/compile/internal/ssa/export_test.go
+++ b/src/cmd/compile/internal/ssa/export_test.go
@@ -146,6 +146,10 @@ func (d DummyFrontend) Fatalf(_ src.XPos, msg string, args ...interface{}) { d.t
 func (d DummyFrontend) Warnl(_ src.XPos, msg string, args ...interface{})  { d.t.Logf(msg, args...) }
 func (d DummyFrontend) Debug_checknil() bool                               { return false }
 
+func (d DummyFrontend) MyImportPath() string {
+	return "my/import/path"
+}
+
 var dummyTypes Types
 
 func init() {
diff --git a/src/cmd/compile/internal/ssa/func.go b/src/cmd/compile/internal/ssa/func.go
index 9e40b6214c..6718b778e1 100644
--- a/src/cmd/compile/internal/ssa/func.go
+++ b/src/cmd/compile/internal/ssa/func.go
@@ -678,7 +678,8 @@ func (f *Func) invalidateCFG() {
 //  GSHS_LOGFILE
 // or standard out if that is empty or there is an error
 // opening the file.
-func (f *Func) DebugHashMatch(evname, name string) bool {
+func (f *Func) DebugHashMatch(evname string) bool {
+	name := f.fe.MyImportPath() + "." + f.Name
 	evhash := os.Getenv(evname)
 	switch evhash {
 	case "":
@@ -727,7 +728,7 @@ func (f *Func) logDebugHashMatch(evname, name string) {
 		file = os.Stdout
 		if tmpfile := os.Getenv("GSHS_LOGFILE"); tmpfile != "" {
 			var err error
-			file, err = os.Create(tmpfile)
+			file, err = os.OpenFile(tmpfile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
 			if err != nil {
 				f.Fatalf("could not open hash-testing logfile %s", tmpfile)
 			}