expmed.c (expand_divmod): If compute_mode is not the same as mode...

        * expmed.c (expand_divmod): If compute_mode is not the same as
        mode, handle the case where convert_modes() causes op1 to no
        longer be a CONST_INT.

From-SVN: r15672

gcc/ChangeLog

 Tue Sep 23 01:15:50 1997  David S. Miller  <davem@tanya.rutgers.edu>
 
+	* expmed.c (expand_divmod): If compute_mode is not the same as
+	mode, handle the case where convert_modes() causes op1 to no
+	longer be a CONST_INT.
+
 	* reorg.c (dbr_schedule): At end of this pass, add REG_BR_PRED
 	note holding get_jump_flags() calculation to all JUMP_INSNs.
 	* rtl.h (enum reg_note): New note types REG_BR_PRED and REG_SAVE_AREA.

gcc/expmed.c

@@ -2831,6 +2831,14 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
     {
       op0 = convert_modes (compute_mode, mode, op0, unsignedp);
       op1 = convert_modes (compute_mode, mode, op1, unsignedp);
+
+      /* convert_modes may have tossed op1 into a register, so we
+	 absolutely must recompute the following.  */
+      op1_is_constant = GET_CODE (op1) == CONST_INT;
+      op1_is_pow2 = (op1_is_constant
+		     && ((EXACT_POWER_OF_2_OR_ZERO_P (INTVAL (op1))
+			  || (! unsignedp
+			      && EXACT_POWER_OF_2_OR_ZERO_P (-INTVAL (op1))))));
     }
 
   /* If one of the operands is a volatile MEM, copy it into a register.  */