sparc.c (emit_soft_tfmode_libcall): Do not allow result to overlap input operands in memory.

2002-05-06  David S. Miller  <davem@redhat.com>

	* config/sparc/sparc.c (emit_soft_tfmode_libcall): Do not
	allow result to overlap input operands in memory.

From-SVN: r53204

gcc/ChangeLog

+2002-05-06  David S. Miller  <davem@redhat.com>
+
+	* config/sparc/sparc.c (emit_soft_tfmode_libcall): Do not
+	allow result to overlap input operands in memory.
+
 2002-05-06  Neil Booth  <neil@daikokuya.demon.co.uk>
 
 doc:

gcc/config/sparc/sparc.c

@@ -2476,7 +2476,7 @@ emit_soft_tfmode_libcall (func_name, nargs, operands)
      rtx *operands;
 {
   rtx ret_slot = NULL, arg[3], func_sym;
-  int i;
+  int i, j;
 
   /* We only expect to be called for conversions, unary, and binary ops.  */
   if (nargs < 2 || nargs > 3)
@@ -2491,7 +2491,25 @@ emit_soft_tfmode_libcall (func_name, nargs, operands)
       if (GET_MODE (this_arg) == TFmode)
 	{
 	  if (GET_CODE (this_arg) == MEM)
-	    this_arg = XEXP (this_arg, 0);
+	    {
+	      this_arg = XEXP (this_arg, 0);
+
+	      /* Make sure the output is not in the same place
+		 as one of our inputs.  */
+	      if (i == 0)
+		{
+		  for (j = 1; j < nargs; j++)
+		    if (rtx_equal_p (operands[0], operands[j]))
+		      break;
+
+		  if (j != nargs)
+		    {
+		      ret_slot = assign_stack_temp (TFmode,
+						    GET_MODE_SIZE (TFmode), 0);
+		      this_arg = XEXP (ret_slot, 0);
+		    }
+		}
+	    }
 	  else if (CONSTANT_P (this_arg))
 	    {
 	      this_slot = force_const_mem (TFmode, this_arg);