tilegx.c (tilegx_expand_prologue): Avoid double-decrement of next_scratch_regno.

	* config/tilegx/tilegx.c (tilegx_expand_prologue): Avoid
	double-decrement of next_scratch_regno.

From-SVN: r197139

gcc/ChangeLog

 2013-03-27  Walter Lee  <walt@tilera.com>
 
+	* config/tilegx/tilegx.c (tilegx_expand_prologue): Avoid
+	double-decrement of next_scratch_regno.
+
+2013-03-27  Walter Lee  <walt@tilera.com>
+
 	* config/tilegx/tilegx.md (insn_v1mulu): Fix constraints on
 	input operands.
 	(insn_v1mulus): Ditto.

gcc/config/tilegx/tilegx.c

@@ -3999,11 +3999,10 @@ tilegx_expand_prologue (void)
 
 	if (r == NULL_RTX)
 	  {
-	    rtx p = compute_frame_addr (offset, &next_scratch_regno);
-	    r = gen_rtx_REG (Pmode, next_scratch_regno--);
+	    int prev_scratch_regno = next_scratch_regno;
+	    r = compute_frame_addr (offset, &next_scratch_regno);
+	    if (prev_scratch_regno != next_scratch_regno)
 	      reg_save_addr[which_scratch] = r;
-
-	    emit_insn (gen_rtx_SET (VOIDmode, r, p));
 	  }
 	else
 	  {