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(rare_destination): Ensure we always correctly handle a null

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JUMP_LABEL.

From-SVN: r6150
This commit is contained in:
Richard Kenner 1993-11-23 18:05:04 -05:00
parent 647902e0ab
commit 65753f5598
1 changed files with 6 additions and 3 deletions
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9
gcc/reorg.c
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@ -1239,7 +1239,7 @@ get_jump_flags (insn, label)
return flags;
}
/* Return 1 if DEST is a destination that will be branched to rarely (the
/* Return 1 if INSN is a destination that will be branched to rarely (the
return point of a function); return 2 if DEST will be branched to very
rarely (a call to a function that doesn't return). Otherwise,
return 0. */
@ -1249,12 +1249,15 @@ rare_destination (insn)
rtx insn;
{
int jump_count = 0;
rtx next;
for (; insn; insn = NEXT_INSN (insn))
for (; insn; insn = next)
{
if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SEQUENCE)
insn = XVECEXP (PATTERN (insn), 0, 0);
next = NEXT_INSN (insn);
switch (GET_CODE (insn))
{
case CODE_LABEL:
@ -1270,7 +1273,7 @@ rare_destination (insn)
return 1;
else if (simplejump_p (insn)
&& jump_count++ < 10)
insn = JUMP_LABEL (insn);
next = JUMP_LABEL (insn);
else
return 0;
}