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[taken from gcc-2.95.3-latest-cvs]

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2001-03-28  Bernd Schmidt  <bernds@redhat.com>
	* flow.c (propagate_block): When trying to delete a case vector, cope
	if its label has LABEL_PRESERVE_P set.
	* varasm.c (force_const_mem): If we have a label, set LABEL_PRESERVE_P
	so it won't get deleted.


git-svn-id: file:///srv/svn/repos/haiku/trunk/buildtools@9591 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Oliver Tappe 2004-10-28 18:22:17 +00:00
parent a8e3cfa07e
commit 4837867f67
2 changed files with 12 additions and 1 deletions
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10
gcc/gcc/flow.c
View File

@ -2744,15 +2744,23 @@ propagate_block (old, first, last, final, significant, bnum, remove_dead_code)
{
if (REG_NOTE_KIND (inote) == REG_LABEL)
{
int n_forced;
rtx label = XEXP (inote, 0);
rtx next;
LABEL_NUSES (label)--;
/* The label may be forced if it has been put in the
constant pool. We can't delete it in this case, but
we still must discard a jump table following it. */
n_forced = 0;
if (LABEL_PRESERVE_P (label))
n_forced++;
/* If this label was attached to an ADDR_VEC, it's
safe to delete the ADDR_VEC. In fact, it's pretty much
mandatory to delete it, because the ADDR_VEC may
be referencing labels that no longer exist. */
if (LABEL_NUSES (label) == 0
if (LABEL_NUSES (label) == n_forced
&& (next = next_nonnote_insn (label)) != NULL
&& GET_CODE (next) == JUMP_INSN
&& (GET_CODE (PATTERN (next)) == ADDR_VEC

3
gcc/gcc/varasm.c
View File

@ -3499,6 +3499,9 @@ force_const_mem (mode, x)
pop_obstacks ();
}
if (GET_CODE (x) == LABEL_REF)
LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
/* Allocate a pool constant descriptor, fill it in, and chain it in. */
pool = (struct pool_constant *) savealloc (sizeof (struct pool_constant));