bug168 (dsymonds) + fix

R=ken
OCL=31399
CL=31399

src/cmd/8g/cgen.c

@@ -91,19 +91,14 @@ cgen(Node *n, Node *res)
 
 	// if both are not addressable, use a temporary.
 	if(!n->addable && !res->addable) {
-		if(is64(n->type)) {
+		// could use regalloc here sometimes,
+		// but have to check for ullman >= UINF.
 		tempalloc(&n1, n->type);
 		cgen(n, &n1);
 		cgen(&n1, res);
 		tempfree(&n1);
 		return;
 	}
-		regalloc(&n1, n->type, N);
-		cgen(n, &n1);
-		cgen(&n1, res);
-		regfree(&n1);
-		return;
-	}
 
 	// if result is not addressable directly but n is,
 	// compute its address and then store via the address.

test/fixedbugs/bug168.go

+// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: bug168
+
+// Copyright 2009 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 main
+
+var g byte = 123;
+var f *byte = &g;
+var b = make([]byte, 5);
+
+func main() {
+	b[0:1][0] = *f;
+	if b[0] != 123 {
+		panic("want 123 got ", b[0]);
+	}	
+}