Fix alpha loop unrolling abort.

	* unroll.c (calculate_giv_inc): Handle increment with code PLUS.

From-SVN: r15004

gcc/ChangeLog

+Sat Aug 30 22:54:26 1997  Jim Wilson  <wilson@cygnus.com>
+
+	* unroll.c (calculate_giv_inc): Handle increment with code PLUS.
+
 Sat Aug 30 10:49:46 1997  David Edelsohn  <edelsohn@mhpcc.edu>
 
 	* rs6000.md: Make DF fused-add operations pay attention to

gcc/unroll.c

@@ -1495,10 +1495,11 @@ calculate_giv_inc (pattern, src_insn, regno)
       if (GET_CODE (increment) == LO_SUM)
 	increment = XEXP (increment, 1);
       else if (GET_CODE (increment) == IOR
-	       || GET_CODE (increment) == ASHIFT)
+	       || GET_CODE (increment) == ASHIFT
+	       || GET_CODE (increment) == PLUS)
 	{
 	  /* The rs6000 port loads some constants with IOR.
-	     The alpha port loads some constants with ASHIFT.  */
+	     The alpha port loads some constants with ASHIFT and PLUS.  */
 	  rtx second_part = XEXP (increment, 1);
 	  enum rtx_code code = GET_CODE (increment);
 
@@ -1513,6 +1514,8 @@ calculate_giv_inc (pattern, src_insn, regno)
 
 	  if (code == IOR)
 	    increment = GEN_INT (INTVAL (increment) | INTVAL (second_part));
+	  else if (code == PLUS)
+	    increment = GEN_INT (INTVAL (increment) + INTVAL (second_part));
 	  else
 	    increment = GEN_INT (INTVAL (increment) << INTVAL (second_part));
 	}