combine.c (try_combine): Mask off sign bits when combining stores to the low and high parts of a...

	* combine.c (try_combine): Mask off sign bits when combining
	stores to the low and high parts of a two-word value.

From-SVN: r48339

gcc/ChangeLog

 2001-12-27  Geoff Keating  <geoffk@redhat.com>
 
+	* combine.c (try_combine): Mask off sign bits when combining
+	stores to the low and high parts of a two-word value.
+
 	* expr.c (expand_expr): Don't mark memory for non-constants as
 	constant.
 

gcc/combine.c

@@ -1650,7 +1650,8 @@ try_combine (i3, i2, i1, new_direct_jump_p)
 	    abort ();
 
 	  lo &= ~(UWIDE_SHIFT_LEFT_BY_BITS_PER_WORD (1) - 1);
-	  lo |= INTVAL (SET_SRC (PATTERN (i3)));
+	  lo |= (INTVAL (SET_SRC (PATTERN (i3))) 
+		 & (UWIDE_SHIFT_LEFT_BY_BITS_PER_WORD (1) - 1));
 	}
       else if (HOST_BITS_PER_WIDE_INT == BITS_PER_WORD)
 	hi = INTVAL (SET_SRC (PATTERN (i3)));