[Bug middle-end/102519] [12 Regression] VRP Jump threader memory explosion

[aldyh at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102519

--- Comment #16 from Aldy Hernandez <aldyh at redhat dot com> ---
On Wed, Sep 29, 2021 at 10:46 PM dje at gcc dot gnu.org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102519
>
> --- Comment #15 from David Edelsohn <dje at gcc dot gnu.org> ---
> I annotated execute_vrp_threader() to call getrusage() and print the size of
> RSS around each call to threader.thread_jumps().  It consistently is growing,
> but not in the threader itself.  Was the former VPR Threader intentionally or
> implicitly freeing some other data allocated by the compiler that the new
> threader is not cleaning up?

Huh.  Very good insight.

:-)

diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c
index 69a3ab0ea9d..c24c67f8874 100644
--- a/gcc/tree-vrp.c
+++ b/gcc/tree-vrp.c
@@ -4408,6 +4408,7 @@ hybrid_threader::~hybrid_threader ()
   delete m_threader;
   delete m_state;
   delete m_ranger;
+  delete m_query;

   scev_finalize ();
   loop_optimizer_finalize ();