[Bug c/38052] genautomata segfaults when -O2 is enabled

[r0bertz at gentoo dot org]

------- Comment #1 from r0bertz at gentoo dot org  2008-11-07 15:41 -------
(In reply to comment #0)
> The problem with output_translate_vect_name is this function has two calls to
> fprintf, and they are called for the first time in this program. 

Another thing I don't understand is why fprintf elsewhere is replaced with
fwrite including in the output_range_type function, but it is still itself in
output_translate_vect_name.

I have done an experiment. Please take a look at the beginning of
output_translate_vect_name function:
0x0040647c <output_translate_vect_name+0>:      addiu  sp,sp,-8
0x00406480 <output_translate_vect_name+4>:      lw     v0,4(a1)
0x00406484 <output_translate_vect_name+8>:      sw     gp,4(sp)
0x00406488 <output_translate_vect_name+12>:     lui    gp,0x44
0x0040648c <output_translate_vect_name+16>:     beqz   v0,0x4064b0
<output_translate_vect_name+52>
0x00406490 <output_translate_vect_name+20>:     addiu  gp,gp,4240
0x00406494 <output_translate_vect_name+24>:     lw     t9,-32532(gp)
0x00406498 <output_translate_vect_name+28>:     lui    a1,0x42
0x0040649c <output_translate_vect_name+32>:     lw     gp,4(sp)
0x004064a0 <output_translate_vect_name+36>:     lw     a2,0(v0)
0x004064a4 <output_translate_vect_name+40>:     addiu  a1,a1,-8008
0x004064a8 <output_translate_vect_name+44>:     jr     t9

If I replace the following instruction with nop, then the genautomata will
succeed.
0x0040649c <output_translate_vect_name+32>:     lw     gp,4(sp)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38052