From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id AE6CF3894C1F; Mon, 1 Mar 2021 09:44:49 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AE6CF3894C1F From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/99309] [10/11 Regression] Segmentation fault with __builtin_constant_p usage at -O2 Date: Mon, 01 Mar 2021 09:44:49 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 10.2.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 10.3 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Mar 2021 09:44:49 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99309 Jakub Jelinek changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |hubicka at gcc dot gnu.org, | |jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek --- Testcase without headers: struct T { int val; explicit constexpr operator int() const { return val; } constexpr T(long v):val(v){} void operator*=3D(T m) { if(__builtin_constant_p(m.val)){ __builtin_printf ("normal\n"); return; }else if(__builtin_constant_p(val)){ __builtin_printf ("recursive\n"); return; }else{ __builtin_printf ("return\n"); return; } } }; int main(){ T constexpr step=3D610334368; T value=3D1; for(int _=3D0; _<100; ++_){ __builtin_printf ("%d %d\n", (int) value, (int) step); value*=3Dstep; __builtin_printf ("%d %d\n", (int) value, (int) step); } } Bet yet another IPA/inlining bug, like e.g. PR98834, the __builtin_unreacha= ble call is added during inlining: Introduced new external node (void __builtin_unreachable()/11).=