[preliminary unsubmitted patch for attribute((optimize(2))) ICE on m68k <mikpe@it.uu.se>]

gcc/

2011-03-02  Mikael Pettersson  <mikpe@it.uu.se>

	PR target/47908
	* config/m68k/m68k.c (m68k_override_options_after_change): New function.
	Disable instruction scheduling for non-ColdFire targets.
	(TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE): Define.

--- gcc-4.6-20110226/gcc/config/m68k/m68k.c.~1~	2010-12-12 15:03:55.000000000 +0100
+++ gcc-4.6-20110226/gcc/config/m68k/m68k.c	2011-03-02 00:07:03.000000000 +0100
@@ -136,6 +136,7 @@ static void m68k_conditional_register_us
 static bool m68k_legitimate_address_p (enum machine_mode, rtx, bool);
 static bool m68k_handle_option (size_t, const char *, int);
 static void m68k_option_override (void);
+static void m68k_override_options_after_change (void);
 static rtx find_addr_reg (rtx);
 static const char *singlemove_string (rtx *);
 static void m68k_output_mi_thunk (FILE *, tree, HOST_WIDE_INT,
@@ -241,6 +242,9 @@ const char *m68k_library_id_string = "_c
 #undef TARGET_OPTION_OVERRIDE
 #define TARGET_OPTION_OVERRIDE m68k_option_override
 
+#undef TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE
+#define TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE m68k_override_options_after_change
+
 #undef TARGET_RTX_COSTS
 #define TARGET_RTX_COSTS m68k_rtx_costs
 
@@ -756,6 +760,17 @@ m68k_option_override (void)
     }
 }
 
+static void
+m68k_override_options_after_change (void)
+{
+  if (m68k_sched_cpu == CPU_UNKNOWN)
+    {
+      flag_schedule_insns = 0;
+      flag_schedule_insns_after_reload = 0;
+      flag_modulo_sched = 0;
+    }
+}
+
 /* Generate a macro of the form __mPREFIX_cpu_NAME, where PREFIX is the
    given argument and NAME is the argument passed to -mcpu.  Return NULL
    if -mcpu was not passed.  */