optabs.c (expand_binop): For double-word integer multiplies...

       * optabs.c (expand_binop): For double-word integer multiplies,
        do not compute intermediate results into something that is
        not a register (such as a SUBREG or MEM).

From-SVN: r53718

gcc/ChangeLog

@@ -42,6 +42,10 @@
 
 2002-05-21  Jeffrey A Law  <law@redhat.com>
 
+ 	* optabs.c (expand_binop): For double-word integer multiplies,
+	do not compute intermediate results into something that is
+	not a register (such as a SUBREG or MEM).
+
 	* i386.c (ix86_sched_reorder_ppro): Fix typo/thinko.
 	(ix86_sched_reorder): Make sure to initialize scheduling
 	data even when there's only one insn in the ready queue.

gcc/optabs.c

@@ -1461,6 +1461,9 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
 	  rtx temp = expand_binop (word_mode, binoptab, op0_low, op1_xhigh,
 				   NULL_RTX, 0, OPTAB_DIRECT);
 
+	  if (!REG_P (product_high))
+	    product_high = force_reg (word_mode, product_high);
+
 	  if (temp != 0)
 	    temp = expand_binop (word_mode, add_optab, temp, product_high,
 				 product_high, 0, next_methods);
@@ -1480,6 +1483,8 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
 	  if (temp != 0 && temp != product_high)
 	    emit_move_insn (product_high, temp);
 
+	  emit_move_insn (operand_subword (product, high, 1, mode), product_high);
+
 	  if (temp != 0)
 	    {
 	      if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)