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From: "slyfox at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/107661] [13 Regression] lambdas get merged incorrectly in tempaltes, cause llvm-12 miscompilation Date: Sat, 12 Nov 2022 20:16:43 +0000 [thread overview] Message-ID: <bug-107661-4-rZxrIhwCk7@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-107661-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107661 --- Comment #3 from Sergei Trofimovich <slyfox at gcc dot gnu.org> --- Created attachment 53889 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53889&action=edit a_simpler.cc a_simpler.cc is a bit more trimmed down version of a.cc: does not need pragmas or argument forwarding. Uses only -O1 -fipa-cp -fipa-cp-clone: $ ./gcc-13-HEAD/bin/gcc -Wall -O1 -fipa-cp -fipa-cp-clone -DDISABLE_HACK a_simpler.cc -o a && ./a $ ./gcc-13-HEAD/bin/gcc -Wall -O1 -fipa-cp -fipa-cp-clone a_simpler.cc -o a && ./a Illegal instruction (core dumped) /// 'function_ref' is taken from llvm-12 as is without any modifications. /// The rest if severely maimed AMDGCN hazard verifier code. // How to break: // $ ./gcc-13-snap/bin/gcc -O1 -fipa-cp -fipa-cp-clone a_simpler.cc -o a && ./a // Illegal instruction (core dumped) // $ ./gcc-13-snap/bin/gcc -O1 -fipa-cp -fipa-cp-clone -DDISABLE_HACK a_simpler.cc -o a && ./a // <ok> // #define DISABLE_HACK 1 #include <utility> class function_ref { void (*callback)(void * callable) = nullptr; void * callable; template<typename Callable> static void callback_fn(void * callable) { (*reinterpret_cast<Callable*>(callable))(); } public: function_ref() = delete; template <typename Callable> function_ref( Callable &&callable, // This is not the copy-constructor. std::enable_if_t< !std::is_same<std::remove_cv_t<std::remove_reference_t<Callable>>, function_ref>::value> * = nullptr) : callback(callback_fn<typename std::remove_reference<Callable>::type>), callable(reinterpret_cast<void*>(&callable)) {} void operator()(void) const { callback(callable); } }; static int get_mbb_b(int MBB) { return MBB; } static int get_mbb_e(int MBB) { static int n = 0; switch (n++) { case 0: return MBB + 1; default: return MBB; } } static void getWaitStatesSince6(int MBB, int I, int WaitStates, function_ref Expired) { Expired(); if (I) { WaitStates += 1; } auto pri = get_mbb_b(MBB); auto pre = get_mbb_e(MBB); if (pri != pre) { getWaitStatesSince6(pri, I, WaitStates, Expired); } } static void getWaitStatesSince3(int MI, function_ref Expired) { getWaitStatesSince6(0, MI, 42, Expired); } static void always_void(void) { } int main() { getWaitStatesSince3(0, always_void); } #if defined(DISABLE_HACK) #else void seemingly_unused_foo(int MI) { struct L { void operator()(void) const { __builtin_trap(); } }; L IsExpiredFn; getWaitStatesSince3(MI, IsExpiredFn); } #endif
next prev parent reply other threads:[~2022-11-12 20:16 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-12 18:06 [Bug middle-end/107661] New: " slyfox at gcc dot gnu.org 2022-11-12 18:13 ` [Bug middle-end/107661] " pinskia at gcc dot gnu.org 2022-11-12 18:21 ` slyfox at gcc dot gnu.org 2022-11-12 20:16 ` slyfox at gcc dot gnu.org [this message] 2022-11-12 22:47 ` slyfox at gcc dot gnu.org 2022-11-13 14:23 ` [Bug middle-end/107661] [13 Regression] lambdas get merged incorrectly in tempaltes, cause llvm-12 miscompilation since r13-3358-ge0403e95689af7 slyfox at gcc dot gnu.org 2022-11-13 14:57 ` jamborm at gcc dot gnu.org 2022-11-14 13:55 ` rguenth at gcc dot gnu.org 2022-11-15 23:21 ` slyfox at gcc dot gnu.org 2022-11-18 8:42 ` slyfox at gcc dot gnu.org 2022-11-18 8:43 ` slyfox at gcc dot gnu.org 2022-11-18 8:54 ` slyfox at gcc dot gnu.org 2022-11-19 20:11 ` slyfox at gcc dot gnu.org 2022-11-19 20:29 ` slyfox at gcc dot gnu.org 2022-11-20 21:26 ` slyfox at gcc dot gnu.org 2022-11-21 22:52 ` jamborm at gcc dot gnu.org 2022-11-22 14:13 ` [Bug ipa/107661] " jamborm at gcc dot gnu.org 2022-11-22 17:30 ` cvs-commit at gcc dot gnu.org 2022-11-22 17:33 ` jamborm at gcc dot gnu.org 2022-11-24 22:46 ` slyfox at gcc dot gnu.org
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