cselib.c (cselib_hash_rtx): Perform addition in unsigned type to avoid signed integer overflow.

	* cselib.c (cselib_hash_rtx): Perform addition in unsigned
	type to avoid signed integer overflow.
	* explow.c (plus_constant): Likewise.

From-SVN: r208804

gcc/ChangeLog

+2014-03-25  Jakub Jelinek  <jakub@redhat.com>
+
+	* cselib.c (cselib_hash_rtx): Perform addition in unsigned
+	type to avoid signed integer overflow.
+	* explow.c (plus_constant): Likewise.
+
 2014-03-25  Dominik Vogt  <vogt@linux.vnet.ibm.com>
 
 	* doc/generic.texi: Correct typos.

gcc/cselib.c

@@ -1137,7 +1137,7 @@ cselib_hash_rtx (rtx x, int create, enum machine_mode memmode)
       return hash ? hash : (unsigned int) ENTRY_VALUE;
 
     case CONST_INT:
-      hash += ((unsigned) CONST_INT << 7) + INTVAL (x);
+      hash += ((unsigned) CONST_INT << 7) + UINTVAL (x);
       return hash ? hash : (unsigned int) CONST_INT;
 
     case CONST_DOUBLE:

gcc/explow.c

@@ -110,7 +110,7 @@ plus_constant (enum machine_mode mode, rtx x, HOST_WIDE_INT c)
 	  return immed_double_int_const (v, mode);
 	}
 
-      return gen_int_mode (INTVAL (x) + c, mode);
+      return gen_int_mode (UINTVAL (x) + c, mode);
 
     case CONST_DOUBLE:
       {