reload.c (find_reloads): Record the existing mode if operand_mode == VOIDmode before replacing a...

        * reload.c (find_reloads): Record the existing mode if
        operand_mode == VOIDmode before replacing a register with
        a constant.
        * i386.md (tstsi, tsthi, tstqi, tstsf, tstdf, tstxf): Set
        i386_compare_op1 to const0_rtx for the benefit of the
        conditional move patterns.
        (movsicc, movhicc, movsfcc, movdfcc, movxfcc, movdicc): Rewrite
        based on suggestions from Jim Wilson.

From-SVN: r20151

gcc/ChangeLog

+Sun May 31 16:11:41 1998  John Wehle  (john@feith.com)
+
+	* reload.c (find_reloads): Record the existing mode if
+	operand_mode == VOIDmode before replacing a register with
+	a constant.
+	* i386.md (tstsi, tsthi, tstqi, tstsf, tstdf, tstxf): Set
+	i386_compare_op1 to const0_rtx for the benefit of the
+	conditional move patterns.
+	(movsicc, movhicc, movsfcc, movdfcc, movxfcc, movdicc): Rewrite
+	based on suggestions from Jim Wilson.
+
 Sun May 31 00:44:02 PDT 1998 Jeff Law  (law@cygnus.com)
 
 	* version.c: Bump for snapshot.

gcc/reload.c

@@ -2641,8 +2641,16 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p)
 	  register int regno = REGNO (recog_operand[i]);
 	  if (reg_equiv_constant[regno] != 0
 	      && (set == 0 || &SET_DEST (set) != recog_operand_loc[i]))
-	    substed_operand[i] = recog_operand[i]
-	      = reg_equiv_constant[regno];
+	    {
+	      /* Record the existing mode so that the check if constants are
+	         allowed will work when operand_mode isn't specified. */
+
+	      if (operand_mode[i] == VOIDmode)
+		operand_mode[i] = GET_MODE (recog_operand[i]);
+
+	      substed_operand[i] = recog_operand[i]
+	        = reg_equiv_constant[regno];
+	    }
 #if 0 /* This might screw code in reload1.c to delete prior output-reload
 	 that feeds this insn.  */
 	  if (reg_equiv_mem[regno] != 0)