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cse.c (cse_insn): Avoid creating direct non-local jumps.

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* cse.c (cse_insn): Avoid creating direct non-local jumps.
	* combine.c (can_combine_p): Likewise.
	* local-alloc. (update_equiv_regs): Likewise.

From-SVN: r88258
This commit is contained in:
Ulrich Weigand 2004-09-28 23:29:02 +00:00 committed by Ulrich Weigand
parent b0b324b07f
commit 2f39b6caf6
4 changed files with 18 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-09-28 Ulrich Weigand <uweigand@de.ibm.com>
* cse.c (cse_insn): Avoid creating direct non-local jumps.
* combine.c (can_combine_p): Likewise.
* local-alloc. (update_equiv_regs): Likewise.
2004-09-28 Richard Henderson <rth@redhat.com>
PR 17531

2
gcc/combine.c
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@ -1176,6 +1176,8 @@ can_combine_p (rtx insn, rtx i3, rtx pred ATTRIBUTE_UNUSED, rtx succ,
/* Don't substitute into an incremented register. */
|| FIND_REG_INC_NOTE (i3, dest)
|| (succ && FIND_REG_INC_NOTE (succ, dest))
/* Don't substitute into a non-local goto, this confuses CFG. */
|| (JUMP_P (i3) && find_reg_note (i3, REG_NON_LOCAL_GOTO, NULL_RTX))
#if 0
/* Don't combine the end of a libcall into anything. */
/* ??? This gives worse code, and appears to be unnecessary, since no

5
gcc/cse.c
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@ -5395,6 +5395,11 @@ cse_insn (rtx insn, rtx libcall_insn)
|| (GET_CODE (trial) == LABEL_REF
&& ! condjump_p (insn))))
{
/* Don't substitute non-local labels, this confuses CFG. */
if (GET_CODE (trial) == LABEL_REF
&& LABEL_REF_NONLOCAL_P (trial))
continue;
SET_SRC (sets[i].rtl) = trial;
cse_jumps_altered = 1;
break;

5
gcc/local-alloc.c
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@ -1010,6 +1010,11 @@ update_equiv_regs (void)
if (! INSN_P (insn))
continue;
/* Don't substitute into a non-local goto, this confuses CFG. */
if (JUMP_P (insn)
&& find_reg_note (insn, REG_NON_LOCAL_GOTO, NULL_RTX))
continue;
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
{
if (REG_NOTE_KIND (link) == REG_DEAD