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gcse.c (insert_store): Error if try to insert store on abnormal edge.

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* gcse.c (insert_store): Error if try to insert store on abnormal edge.
	(store_motion): Don't move store if any edge we'd want to move it
	to is abnormal.

From-SVN: r91447
This commit is contained in:
Richard Kenner 2004-11-29 00:56:58 +00:00 committed by Richard Kenner
parent 45d8710e5e
commit b16aa8a5d9
2 changed files with 27 additions and 8 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
2004-11-28 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* gcse.c (insert_store): Error if try to insert store on abnormal edge.
(store_motion): Don't move store if any edge we'd want to move it
to is abnormal.
* expr.c (expand_expr_real_1, case ARRAY_REF): Properly fold with
non-zero lower bound.

31
gcc/gcse.c
View File

@ -4219,7 +4219,7 @@ pre_edge_insert (struct edge_list *edge_list, struct expr **index_map)
handling this situation. This one is easiest for
now. */
if ((eg->flags & EDGE_ABNORMAL) == EDGE_ABNORMAL)
if (eg->flags & EDGE_ABNORMAL)
insert_insn_end_bb (index_map[j], bb, 0);
else
{
@ -6220,13 +6220,9 @@ insert_store (struct ls_expr * expr, edge e)
return 0;
}
/* We can't insert on this edge, so we'll insert at the head of the
successors block. See Morgan, sec 10.5. */
if ((e->flags & EDGE_ABNORMAL) == EDGE_ABNORMAL)
{
insert_insn_start_bb (insn, bb);
return 0;
}
/* We can't put stores in the front of blocks pointed to by abnormal
edges since that may put a store where one didn't used to be. */
gcc_assert (!(e->flags & EDGE_ABNORMAL));
insert_insn_on_edge (insn, e);
@ -6490,6 +6486,25 @@ store_motion (void)
/* Now we want to insert the new stores which are going to be needed. */
for (ptr = first_ls_expr (); ptr != NULL; ptr = next_ls_expr (ptr))
{
/* If any of the edges we have above are abnormal, we can't move this
store. */
for (x = NUM_EDGES (edge_list) - 1; x >= 0; x--)
if (TEST_BIT (pre_insert_map[x], ptr->index)
&& (INDEX_EDGE (edge_list, x)->flags & EDGE_ABNORMAL))
break;
if (x >= 0)
{
if (gcse_file != NULL)
fprintf (gcse_file,
"Can't replace store %d: abnormal edge from %d to %d\n",
ptr->index, INDEX_EDGE (edge_list, x)->src->index,
INDEX_EDGE (edge_list, x)->dest->index);
continue;
}
/* Now we want to insert the new stores which are going to be needed. */
FOR_EACH_BB (bb)
if (TEST_BIT (pre_delete_map[bb->index], ptr->index))
delete_store (ptr, bb);