m32c.c (m32c_option_override): Always disable function-cse in 16-bit mode.

* config/m32c/m32c.c (m32c_option_override): Always disable
function-cse in 16-bit mode.  Indirect calls are always worse than
direct calls as there is no 16-bit indirect call opcode.
(m32c_override_options_after_change): New, likewise.

From-SVN: r165737

gcc/ChangeLog

+2010-10-20  DJ Delorie  <dj@redhat.com>
+
+	* config/m32c/m32c.c (m32c_option_override): Always disable
+	function-cse in 16-bit mode.  Indirect calls are always worse than
+	direct calls as there is no 16-bit indirect call opcode.
+	(m32c_override_options_after_change): New, likewise.
+
 2010-10-20  Nathan Froyd  <froydnj@codesourcery.com>
 
 	* ifcvt.c (noce_emit_cmove): If both of the values are SUBREGs, try

gcc/config/m32c/m32c.c

@@ -429,6 +429,21 @@ m32c_option_override (void)
   /* This target defaults to strict volatile bitfields.  */
   if (flag_strict_volatile_bitfields < 0)
     flag_strict_volatile_bitfields = 1;
+
+  /* r8c/m16c have no 16-bit indirect call, so thunks are involved.
+     This is always worse than an absolute call.  */
+  if (TARGET_A16)
+    flag_no_function_cse = 1;
+}
+
+#undef TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE
+#define TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE m32c_override_options_after_change
+
+static void
+m32c_override_options_after_change (void)
+{
+  if (TARGET_A16)
+    flag_no_function_cse = 1;
 }
 
 /* Defining data structures for per-function information */