mips fix

[Jeffrey A Law]

It is possible for an insn (call it insn1) to have a dependency on a previous
insn (call it insn2) that is not an INSN.  For example insn2 could be a
NOTE_INSN_DELETED.

Thus when walking the dependency list for insn1 we must not examine
the pattern of the link unless we know it is a JUMP_INSN, CALL_INSN or
INSN.

For this code in mips.md we only care about INSNs, so we do not bother
to check for CALL_INSN or JUMP_INSN.


        * mips.md (div_trap_normal, div_trap_mips16): Require the dependent
        insn to be an INSN before looking at its pattern.

Index: mips.md
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/config/mips/mips.md,v
retrieving revision 1.53
diff -c -3 -p -r1.53 mips.md
*** mips.md	1999/02/04 07:51:51	1.53
--- mips.md	1999/03/01 23:39:34
***************
*** 2441,2446 ****
--- 2441,2447 ----
    for (link = LOG_LINKS (insn); link; link = XEXP (link, 1))
  
      if ((int) REG_DEP_ANTI == (int) REG_NOTE_KIND (link)
+         && GET_CODE (XEXP (link, 0)) == INSN
          && GET_CODE (PATTERN (XEXP (link, 0))) == TRAP_IF
  	&& REGNO (operands[1]) == 0)
        have_dep_anti = 1;
***************
*** 2485,2490 ****
--- 2486,2492 ----
    for (link = LOG_LINKS (insn); link; link = XEXP (link, 1))
  
      if ((int) REG_DEP_ANTI == (int) REG_NOTE_KIND (link)
+         && GET_CODE (XEXP (link, 0)) == INSN
          && GET_CODE (PATTERN (XEXP (link, 0))) == TRAP_IF
  	&& REGNO (operands[1]) == 0)
        have_dep_anti = 1;