runtime: Smhasher tests of our map hash function.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/13436045

src/pkg/runtime/alg.c

@@ -513,3 +513,29 @@ runtime·equal(Type *t, ...)
 	ret = ROUND(ret, Structrnd);
 	t->alg->equal((bool*)ret, t->size, x, y);
 }
+
+// Testing adapters for hash quality tests (see hash_test.go)
+void runtime·haveGoodHash(bool res) {
+	res = use_aeshash;
+	FLUSH(&res);
+}
+void runtime·stringHash(String s, uintptr seed, uintptr res) {
+	runtime·algarray[ASTRING].hash(&seed, sizeof(String), &s);
+	res = seed;
+	FLUSH(&res);
+}
+void runtime·bytesHash(Slice s, uintptr seed, uintptr res) {
+	runtime·algarray[AMEM].hash(&seed, s.len, s.array);
+	res = seed;
+	FLUSH(&res);
+}
+void runtime·int32Hash(uint32 i, uintptr seed, uintptr res) {
+	runtime·algarray[AMEM32].hash(&seed, sizeof(uint32), &i);
+	res = seed;
+	FLUSH(&res);
+}
+void runtime·int64Hash(uint64 i, uintptr seed, uintptr res) {
+	runtime·algarray[AMEM64].hash(&seed, sizeof(uint64), &i);
+	res = seed;
+	FLUSH(&res);
+}

src/pkg/runtime/export_test.go

@@ -67,3 +67,15 @@ func testSchedLocalQueueSteal()
 
 var TestSchedLocalQueue1 = testSchedLocalQueue
 var TestSchedLocalQueueSteal1 = testSchedLocalQueueSteal
+
+func haveGoodHash() bool
+func stringHash(s string, seed uintptr) uintptr
+func bytesHash(b []byte, seed uintptr) uintptr
+func int32Hash(i uint32, seed uintptr) uintptr
+func int64Hash(i uint64, seed uintptr) uintptr
+
+var HaveGoodHash = haveGoodHash
+var StringHash = stringHash
+var BytesHash = bytesHash
+var Int32Hash = int32Hash
+var Int64Hash = int64Hash