[Bug middle-end/49220] ICE in create_pre_exit, at mode-switching.c:401

[kkojima at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49220

Kazumoto Kojima <kkojima at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
                 CC|                            |kkojima at gcc dot gnu.org

--- Comment #1 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2011-05-29 
12:39:21 UTC ---
I think that create_pre_exit is used by SH target only.
I'm testing the patch below.

--- ORIG/trunk/gcc/mode-switching.c    2010-11-20 09:24:49.000000000 +0900
+++ trunk/gcc/mode-switching.c    2011-05-29 21:24:18.000000000 +0900
@@ -324,7 +324,14 @@ create_pre_exit (int n_entities, int *en
                  && GET_CODE (SUBREG_REG (copy_reg)) == REG)
               copy_start = REGNO (SUBREG_REG (copy_reg));
             else
-              break;
+              {
+            /* When control reaches end of non-void function,
+               there are no return copy insns at all.  This
+               avoids an ice on that invalid function.  */
+            if (ret_start + nregs == ret_end)
+              short_block = 1;
+            break;
+              }
             if (copy_start >= FIRST_PSEUDO_REGISTER)
               break;
             copy_num