[Bug target/28040] New: [m68k]wrong move const extends output at coldfire v4

[tyokota at k2 dot dion dot ne dot jp]

Hi
I think gcc-4.1.1 generates wrong outputs on coldfire v4 at this code.
-----------------------------
struct ab {
  int a;
  unsigned int b;
};

int
main () {
  struct ab _ab;
  short a = 0;
  unsigned short b = 0;
  _ab.a = -999;
  _ab.b = 1000;

  a = _ab.a;
  b = _ab.b;
  printf("%d\n", a );
  printf("%d\n", b );
  return 0;
}
---------------------

./xgcc  -m5407 -S ./test.c

---------------------
        ...
        link.w %fp,#-8
        mvzw #-999,%d0       <- zero extends(_ab.a)
        move.l %d0,-8(%fp)
        mvsw #1000,%d0       <- sign extends(_ab.b)
        move.l %d0,-4(%fp)
        move.l -8(%fp),%d0
        move.l %d0,-(%sp)
        ....
--------------------------------

and This is a patch.

gcc/config/m68k/m68k.c: output_move_const_into_data_reg.

--- m68k.bak    2006-06-15 19:49:00.000000000 +0900
+++ m68k.c      2006-06-15 19:49:42.000000000 +0900
@@ -1658,9 +1658,9 @@
   switch (const_method (operands[1]))
     {
     case MVZ:
-      return "mvsw %1,%0";
-    case MVS:
       return "mvzw %1,%0";
+    case MVS:
+      return "mvsw %1,%0";
     case MOVQ :
       return "moveq %1,%0";
     case NOTB :


-- 
           Summary: [m68k]wrong move const extends output at coldfire v4
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tyokota at k2 dot dion dot ne dot jp
 GCC build triplet: x86-64-elf-linux
  GCC host triplet: x86-64-elf-linux
GCC target triplet: m68k-elf-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28040