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Return undefined on edges which are not executed.

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When a branch has been folded, mark any range requests on the unexecutable edge as
UNDEFINED.

	* gimple-range-gori.cc (gori_compute::outgoing_edge_range_p): Check for
	cond_false and cond_true on branches.
This commit is contained in:
Andrew MacLeod 2021-07-28 08:30:02 -04:00
parent 31534ac26e
commit 04600a4722
1 changed files with 15 additions and 0 deletions
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15
gcc/gimple-range-gori.cc
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@ -1104,6 +1104,21 @@ gori_compute::outgoing_edge_range_p (irange &r, edge e, tree name,
fur_stmt src (stmt, &q);
// If this edge is never taken, return undefined.
gcond *gc = dyn_cast<gcond *> (stmt);
if (gc)
{
if (((e->flags & EDGE_TRUE_VALUE) && gimple_cond_false_p (gc))
|| ((e->flags & EDGE_FALSE_VALUE) && gimple_cond_true_p (gc)))
{
r.set_undefined ();
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Outgoing edge %d->%d unexecutable.\n",
e->src->index, e->dest->index);
return true;
}
}
// If NAME can be calculated on the edge, use that.
if (is_export_p (name, e->src))
{