gcc/gcc9-pr88044.patch

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2019-01-19 15:14:16 +00:00
2019-01-18 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/88044
* tree-ssa-loop-niter.c (number_of_iterations_cond): If condition
is false in the first iteration, but !every_iteration, return false
instead of true with niter->niter zero.
--- gcc/tree-ssa-loop-niter.c.jj 2019-01-10 11:43:02.254577008 +0100
+++ gcc/tree-ssa-loop-niter.c 2019-01-18 19:51:00.245504728 +0100
@@ -1824,6 +1824,8 @@ number_of_iterations_cond (struct loop *
tree tem = fold_binary (code, boolean_type_node, iv0->base, iv1->base);
if (tem && integer_zerop (tem))
{
+ if (!every_iteration)
+ return false;
niter->niter = build_int_cst (unsigned_type_for (type), 0);
niter->max = 0;
return true;