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reorg.c (fill_simple_delay_slots): If an instruction might throw an exception that will be caught within this...

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* reorg.c (fill_simple_delay_slots): If an instruction might throw
	an exception that will be caught within this function, do not fill
	its delay slot with any subsequent instruction.

From-SVN: r44171
This commit is contained in:
Mark Mitchell 2001-07-20 02:38:57 +00:00 committed by Mark Mitchell
parent 3b73bce168
commit be672de8ae
2 changed files with 27 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,9 @@
2001-07-19 Mark Mitchell <mark@codesourcery.com>
* reorg.c (fill_simple_delay_slots): If an instruction might throw
an exception that will be caught within this function, do not fill
its delay slot with any subsequent instruction.
2001-07-19 Steve Ellcey <sje@cup.hp.com>
* tm.texi (POINTERS_EXTEND_UNSIGNED) Modify definition.

21
gcc/reorg.c
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@ -2223,6 +2223,27 @@ fill_simple_delay_slots (non_jumps_p)
fill_eager_delay_slots anyways, it was just deleted. */
if (slots_filled != slots_to_fill
/* If this instruction could throw an exception which is
caught in the same function, then it's not safe to fill
the delay slot with an instruction from beyond this
point. For example, consider:
int i = 2;
try {
f();
i = 3;
} catch (...) {}
return i;
Even though `i' is a local variable, we must be sure not
to put `i = 3' in the delay slot if `f' might throw an
exception.
Presumably, we should also check to see if we could get
back to this function via `setjmp'. */
&& !can_throw_internal (insn)
&& (GET_CODE (insn) != JUMP_INSN
|| ((condjump_p (insn) || condjump_in_parallel_p (insn))
&& ! simplejump_p (insn)