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-rw-r--r--gcc/ChangeLog5
-rw-r--r--gcc/tree-ssa-loop-niter.c2
2 files changed, 7 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 64f920e..feda772 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
2019-01-22 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.
+
PR rtl-optimization/88904
* cfgcleanup.c (thread_jump): Verify cond2 doesn't mention
any nonequal registers before processing BB_END (b).
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c
index 622d18a..470b6a2 100644
--- a/gcc/tree-ssa-loop-niter.c
+++ b/gcc/tree-ssa-loop-niter.c
@@ -1824,6 +1824,8 @@ number_of_iterations_cond (struct loop *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;