}
\f
/* Delete insn INSN from the chain of insns and update label ref counts
- and delete insns now unreachable.
+ and delete insns now unreachable.
- Returns the first insn after INSN that was not deleted.
+ Returns the first insn after INSN that was not deleted.
Usage of this instruction is deprecated. Use delete_insn instead and
subsequent cfg_cleanup pass to delete unreachable code if needed. */
is also an unconditional jump in that case. */
}
\f
-/* We have determined that INSN is never reached, and are about to
- delete it. Print a warning if the user asked for one.
+/* We have determined that AVOIDED_INSN is never reached, and are
+ about to delete it. If the insn chain between AVOIDED_INSN and
+ FINISH contains more than one line from the current function, and
+ contains at least one operation, print a warning if the user asked
+ for it. If FINISH is NULL, look between AVOIDED_INSN and a LABEL.
- To try to make this warning more useful, this should only be called
- once per basic block not reached, and it only warns when the basic
- block contains more than one line from the current function, and
- contains at least one operation. CSE and inlining can duplicate insns,
- so it's possible to get spurious warnings from this. */
+ CSE and inlining can duplicate insns, so it's possible to get
+ spurious warnings from this. */
void
never_reached_warning (avoided_insn, finish)
rtx a_line_note = NULL;
int two_avoided_lines = 0, contains_insn = 0, reached_end = 0;
- if (! warn_notreached)
+ if (!warn_notreached)
return;
- /* Scan forwards, looking at LINE_NUMBER notes, until
- we hit a LABEL or we run out of insns. */
+ /* Scan forwards, looking at LINE_NUMBER notes, until we hit a LABEL
+ in case FINISH is NULL, otherwise until we run out of insns. */
for (insn = avoided_insn; insn != NULL; insn = NEXT_INSN (insn))
{
- if (finish == NULL && GET_CODE (insn) == CODE_LABEL)
+ if ((finish == NULL && GET_CODE (insn) == CODE_LABEL)
+ || GET_CODE (insn) == BARRIER)
break;
if (GET_CODE (insn) == NOTE /* A line number note? */