PR tree-optimization/92056

	* tree-object-size.c (cond_expr_object_size): Return early if then_
	processing resulted in unknown size.

	* gcc.c-torture/compile/pr92056.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@277093 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5fccbd4d1d8802f2c263214e531969baedd1ccc3..0dd5d8ca839bb6fb64e825bf74bfa5640c03ee7d 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2019-10-17  Jakub Jelinek  <jakub@redhat.com>
 
+       PR tree-optimization/92056
+       * tree-object-size.c (cond_expr_object_size): Return early if then_
+       processing resulted in unknown size.
+
        PR tree-optimization/92115
        * tree-ssa-ifcombine.c (ifcombine_ifandif): Force condition into
        temporary if it could trap.

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c79ba7b989a168ffe53cd4b01fa25d0b463e7fc6..eb3112d2672b4cf60d160a9b7bc5b62961568d9e 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2019-10-17  Jakub Jelinek  <jakub@redhat.com>
 
+       PR tree-optimization/92056
+       * gcc.c-torture/compile/pr92056.c: New test.
+
        PR tree-optimization/92115
        * gcc.dg/pr92115.c: New test.
 

diff --git a/gcc/testsuite/gcc.c-torture/compile/pr92056.c b/gcc/testsuite/gcc.c-torture/compile/pr92056.c
new file mode 100644 (file)
index 0000000..d04da76
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr92056.c
@@ -0,0 +1,18 @@
+/* PR tree-optimization/92056 */
+
+const char *d;
+
+void
+foo (int c, char *e, const char *a, const char *b)
+{
+  switch (c)
+    {
+    case 33:
+      for (;; d++)
+        if (__builtin_strcmp (b ? : "", d))
+          return;
+      break;
+    case 4:
+      __builtin_sprintf (e, a);
+    }
+}

diff --git a/gcc/tree-object-size.c b/gcc/tree-object-size.c
index db9b5694e85d2afce4df21e730823efd3dfc5f7e..6e79bbd1d917fe8e49869ad4a939e9cfb4578b86 100644 (file)
--- a/gcc/tree-object-size.c
+++ b/gcc/tree-object-size.c
@@ -903,6 +903,9 @@ cond_expr_object_size (struct object_size_info *osi, tree var, gimple *stmt)
   else
     expr_object_size (osi, var, then_);
 
+  if (object_sizes[object_size_type][varno] == unknown[object_size_type])
+    return reexamine;
+
   if (TREE_CODE (else_) == SSA_NAME)
     reexamine |= merge_object_sizes (osi, var, else_, 0);
   else