PPro and egcs

[Jeffrey A Law]

  In message < m0xPI2T-0004edC@ocean.lucon.org >you write:
  > Hi,
  > 
  > Has anyone tried egcs on PPro? I got an error.
  > 
  > # gcc -O -march=i686 -S foo.c -fomit-frame-pointer
  > foo.c: In function `nfs_readpage_sync':
  > foo.c:1618: internal error--insn does not satisfy its constraints:
  > (insn 317 316 139 (parallel[ 
  >             (set (reg/v:SI 3 %ebx)
  >                 (if_then_else:SI (ne (cc0)
  >                         (const_int 0))
  >                     (reg:SI 0 %eax)
  >                     (const_int -22)))
  >             (clobber (reg:SI 0 %eax))
  >         ] ) 374 {movsicc_1} (nil)
  >     (expr_list:REG_DEAD (reg:SI 0 %eax)
  >         (expr_list:REG_UNUSED (reg:SI 0 %eax)
  >             (nil))))
  > gcc: Internal compiler error: program cc1 got fatal signal 6
Well, I've got my ppro running, and I've actually been able to trip this
problem.  No clue why I couldn't get it to trip with my cross compiler.

It's a tough little nut to crack, largly because of reload's insistence
on replacing regs with CONST_INTs when the register has a REG_EQUIV note.

On the up side, if I disable the cmov patterns, I can get a clean bootstrap,
so odds are once we fix the cmov stuff there won't be any serious ppro
problems lurking around the corner.

jeff