m68k PIC bug in gcc 2.95.2

[Kars de Jong]

Hi,

System: Linux/m68k kernel 2.2.10
Libc: glibc 2.1.2
Gcc: gcc 2.95.2
Cflags: -O -fPIC

The following program miscompiles with gcc 2.95.2. The problem was probably
introduced in egcs-19990629, when the PIC prologue/epilogue for m68k was
rewritten.
The program compiles correct with gcc 2.7.2.3.

------------------------------------------------------------------------------
int frog() {
  if (2 <= 1) {
    printf("test");
  }
  return -1;
}
------------------------------------------------------------------------------

bash# gcc -O -fPIC bing.c -S

Output bing.s:

------------------------------------------------------------------------------
frog:
	link.w %a6,#0
	lea (%pc, _GLOBAL_OFFSET_TABLE_@GOTPC), %a5
	moveq.l #-1,%d0	| 22	movsi+1/2
	unlk %a6
	rts
------------------------------------------------------------------------------

The PIC register (a5) is used without being saved or restored. It looks like
the 'lea' should have been eliminated after optimisation, the save/restore
were eliminated (when compiling with -O0 a5 is saved/restored).

Kars.
-- 
------------------------------------------------------------------------------
Kars de Jong             Signaalkamp rules the waves!       Turrican@Discworld
--------======]**-----|      jongk@cs.utwente.nl      |-----**[======---------