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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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14
gcc/function.c
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@ -4750,7 +4750,8 @@ reposition_prologue_and_epilogue_notes (f)
reorg has run. */
for (len = 0; prologue[len]; len++)
;
for (insn = f; insn; insn = NEXT_INSN (insn))
for (insn = f; len && insn; insn = NEXT_INSN (insn))
{
if (GET_CODE (insn) == NOTE)
{
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
@ -4761,10 +4762,12 @@ reposition_prologue_and_epilogue_notes (f)
/* 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)
@ -4772,7 +4775,7 @@ reposition_prologue_and_epilogue_notes (f)
if (next)
PREV_INSN (next) = prev;
add_insn_after (note, insn);
break;
}
}
}
@ -4785,7 +4788,8 @@ 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))
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)
@ -4796,10 +4800,12 @@ reposition_prologue_and_epilogue_notes (f)
/* 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)
@ -4807,7 +4813,7 @@ reposition_prologue_and_epilogue_notes (f)
if (next)
PREV_INSN (next) = prev;
add_insn_after (note, PREV_INSN (insn));
break;
}
}
}
}