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(reposition_prologue_and_epilogue_notes): Allow 

for zero length prologue and epilogue list.

From-SVN: r3465
This commit is contained in:
John Hassey 1993-02-12 15:52:54 +00:00
parent f3acae4d7c
commit 9392c110eb
1 changed files with 54 additions and 48 deletions
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102
gcc/function.c
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@ -4750,30 +4750,33 @@ reposition_prologue_and_epilogue_notes (f)
reorg has run. */
for (len = 0; prologue[len]; len++)
;
for (insn = f; insn; insn = NEXT_INSN (insn))
if (GET_CODE (insn) == NOTE)
{
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
note = insn;
}
else if ((len -= contains (insn, prologue)) == 0)
{
/* Find the prologue-end note if we haven't already, and
move it to just after the last prologue insn. */
if (note == 0)
for (note = insn; note = NEXT_INSN (note);)
if (GET_CODE (note) == NOTE
&& NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END)
break;
next = NEXT_INSN (note);
prev = PREV_INSN (note);
if (prev)
NEXT_INSN (prev) = next;
if (next)
PREV_INSN (next) = prev;
add_insn_after (note, insn);
break;
}
for (insn = f; len && insn; insn = NEXT_INSN (insn))
{
if (GET_CODE (insn) == NOTE)
{
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
note = insn;
}
else if ((len -= contains (insn, prologue)) == 0)
{
/* Find the prologue-end note if we haven't already, and
move it to just after the last prologue insn. */
if (note == 0)
{
for (note = insn; note = NEXT_INSN (note);)
if (GET_CODE (note) == NOTE
&& NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END)
break;
}
next = NEXT_INSN (note);
prev = PREV_INSN (note);
if (prev)
NEXT_INSN (prev) = next;
if (next)
PREV_INSN (next) = prev;
add_insn_after (note, insn);
}
}
}
if (epilogue)
@ -4785,30 +4788,33 @@ reposition_prologue_and_epilogue_notes (f)
reorg has run. */
for (len = 0; epilogue[len]; len++)
;
for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
if (GET_CODE (insn) == NOTE)
{
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG)
note = insn;
}
else if ((len -= contains (insn, epilogue)) == 0)
{
/* Find the epilogue-begin note if we haven't already, and
move it to just before the first epilogue insn. */
if (note == 0)
for (note = insn; note = PREV_INSN (note);)
if (GET_CODE (note) == NOTE
&& NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG)
break;
next = NEXT_INSN (note);
prev = PREV_INSN (note);
if (prev)
NEXT_INSN (prev) = next;
if (next)
PREV_INSN (next) = prev;
add_insn_after (note, PREV_INSN (insn));
break;
}
for (insn = get_last_insn (); len && insn; insn = PREV_INSN (insn))
{
if (GET_CODE (insn) == NOTE)
{
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG)
note = insn;
}
else if ((len -= contains (insn, epilogue)) == 0)
{
/* Find the epilogue-begin note if we haven't already, and
move it to just before the first epilogue insn. */
if (note == 0)
{
for (note = insn; note = PREV_INSN (note);)
if (GET_CODE (note) == NOTE
&& NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG)
break;
}
next = NEXT_INSN (note);
prev = PREV_INSN (note);
if (prev)
NEXT_INSN (prev) = next;
if (next)
PREV_INSN (next) = prev;
add_insn_after (note, PREV_INSN (insn));
}
}
}
}
#endif /* HAVE_prologue or HAVE_epilogue */