re PR target/8407 ([IA-64] ICE in simplify_gen_subreg, at simplify-rtx.c:2711…

re PR target/8407 ([IA-64] ICE in simplify_gen_subreg, at simplify-rtx.c:2711 with very simple code)

PR target/8407
* config/ia64/ia64.c (ia64_function_arg): For single-reg HFA, call
gen_rtx_REG to create new reg with argument mode.

From-SVN: r74142

gcc/ChangeLog

+2003-12-01  James E Wilson  <wilson@specifixinc.com>
+
+	PR target/8407
+	* config/ia64/ia64.c (ia64_function_arg): For single-reg HFA, call
+	gen_rtx_REG to create new reg with argument mode.
+
 2003-12-01  Steven Bosscher  <stevenb@suse.de>
 
 	* ggc.h (struct alloc_zone): Move forward declaration up.

gcc/config/ia64/ia64.c

@@ -3527,9 +3527,10 @@ ia64_function_arg (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type,
 		      ? 1 : GET_MODE_SIZE (gr_mode) / UNITS_PER_WORD;
 	}
 
-      /* If we ended up using just one location, just return that one loc.  */
+      /* If we ended up using just one location, just return that one loc, but
+	 change the mode back to the argument mode.  */
       if (i == 1)
-	return XEXP (loc[0], 0);
+	return gen_rtx_REG (mode, REGNO (XEXP (loc[0], 0)));
       else
 	return gen_rtx_PARALLEL (mode, gen_rtvec_v (i, loc));
     }