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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/94910] detect_stack_use_after_return=1 is much slower
 than clang's
Date: Tue, 19 May 2020 13:26:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94910

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |marxin at gcc dot g=
nu.org

--- Comment #7 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
I was able to reproduce that on tramp3d as well. I bet the problem is that =
the
inline expansion does not clear:
**SavedFlagPtr(FakeStack) =3D 0

as LLVM does:
https://github.com/llvm/llvm-project/blob/master/llvm/lib/Transforms/Instru=
mentation/AddressSanitizer.cpp#L3279-L3292

Let me take a look.=