code gen bug in ++ and --

SVN=121476

src/cmd/6g/gen.c

@@ -694,16 +694,14 @@ cgen_asop(Node *nl, Node *nr, int op)
 	regalloc(&n1, nl->type, N);
 	if(nl->addable) {
 		cgen(nr, &n1);
-		gins(a, nl, &n1);
-		gmove(&n1, nl);
+		gins(a, &n1, nl);
 		regfree(&n1);
 		return;
 	}
 
 	igen(nl, &n2, N);
 	cgen(nr, &n1);
-	gins(a, &n2, &n1);
-	gmove(&n1, &n2);
+	gins(a, &n1, &n2);
 	regfree(&n1);
 	regfree(&n2);
 }

src/cmd/gc/go.h

@@ -208,7 +208,6 @@ enum
 	OEQ, ONE, OLT, OLE, OGE, OGT,
 	OADD, OSUB, OOR, OXOR,
 	OMUL, ODIV, OMOD, OLSH, ORSH, OAND,
-	ODEC, OINC,
 	OLEN,
 	OFUNC,
 	OLABEL,

src/cmd/gc/subr.c

@@ -606,8 +606,6 @@ opnames[] =
 	[OOROR]		= "OROR",
 	[OOR]		= "OR",
 	[OPLUS]		= "PLUS",
-	[ODEC]		= "DEC",
-	[OINC]		= "INC",
 	[OREGISTER]	= "REGISTER",
 	[OINDREG]	= "INDREG",
 	[OSEND]		= "SEND",