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cfgrtl.c (purge_dead_edges): Fix handling of EH edges. 

* cfgrtl.c (purge_dead_edges): Fix handling of EH edges.

	* i386.h (CONDITIONAL_REGISTER_USAGE): Do not write to
	PIC_OFFSET_TABLE_REGNUM when it is INVALID_REGNUM

From-SVN: r50128
This commit is contained in:
Jan Hubicka 2002-02-28 11:03:16 +00:00 committed by Jan Hubicka
parent 38c1593d57
commit 70da1d030d
3 changed files with 32 additions and 29 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
Don Feb 28 11:24:30 CET 2002 Jan Hubicka <jh@suse.cz>
* cfgrtl.c (purge_dead_edges): Fix handling of EH edges.
* i386.h (CONDITIONAL_REGISTER_USAGE): Do not write to
PIC_OFFSET_TABLE_REGNUM when it is INVALID_REGNUM
Don Feb 28 11:07:36 CET 2002 Jan Hubicka <jh@suse.cz>
* basic-block.h (BB_REACHABLE): Renumber.

52
gcc/cfgrtl.c
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@ -1899,9 +1899,30 @@ purge_dead_edges (bb)
rtx insn = bb->end, note;
bool purged = false;
/* ??? This makes no sense since the later test includes more cases. */
if (GET_CODE (insn) == JUMP_INSN && !simplejump_p (insn))
return false;
/* If this instruction cannot trap, remove REG_EH_REGION notes. */
if (GET_CODE (insn) == INSN
&& (note = find_reg_note (insn, REG_EH_REGION, NULL)))
{
rtx eqnote;
if (! may_trap_p (PATTERN (insn))
|| ((eqnote = find_reg_equal_equiv_note (insn))
&& ! may_trap_p (XEXP (eqnote, 0))))
remove_note (insn, note);
}
/* Cleanup abnormal edges caused by throwing insns that have been
eliminated. */
if (! can_throw_internal (bb->end))
for (e = bb->succ; e; e = next)
{
next = e->succ_next;
if (e->flags & EDGE_EH)
{
remove_edge (e);
purged = true;
}
}
if (GET_CODE (insn) == JUMP_INSN)
{
@ -1970,31 +1991,6 @@ purge_dead_edges (bb)
return purged;
}
/* If this instruction cannot trap, remove REG_EH_REGION notes. */
if (GET_CODE (insn) == INSN
&& (note = find_reg_note (insn, REG_EH_REGION, NULL)))
{
rtx eqnote;
if (! may_trap_p (PATTERN (insn))
|| ((eqnote = find_reg_equal_equiv_note (insn))
&& ! may_trap_p (XEXP (eqnote, 0))))
remove_note (insn, note);
}
/* Cleanup abnormal edges caused by throwing insns that have been
eliminated. */
if (! can_throw_internal (bb->end))
for (e = bb->succ; e; e = next)
{
next = e->succ_next;
if (e->flags & EDGE_EH)
{
remove_edge (e);
purged = true;
}
}
/* If we don't see a jump insn, we don't know exactly why the block would
have been broken at this point. Look for a simple, non-fallthru edge,
as these are only created by conditional branches. If we find such an

2
gcc/config/i386/i386.h
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@ -957,7 +957,7 @@ do { \
call_used_regs[i] = (call_used_regs[i] \
& (TARGET_64BIT ? 2 : 1)) != 0; \
} \
if (flag_pic) \
if (flag_pic && PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM) \
{ \
fixed_regs[PIC_OFFSET_TABLE_REGNUM] = 1; \
call_used_regs[PIC_OFFSET_TABLE_REGNUM] = 1; \