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From: "mikulas at artax dot karlin.mff.cuni.cz" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/54848] New: -ftrapv doesn't work when assigning to an integer with smaller size Date: Sun, 07 Oct 2012 16:13:00 -0000 [thread overview] Message-ID: <bug-54848-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54848 Bug #: 54848 Summary: -ftrapv doesn't work when assigning to an integer with smaller size Classification: Unclassified Product: gcc Version: 4.7.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned@gcc.gnu.org ReportedBy: mikulas@artax.karlin.mff.cuni.cz Host: i686-pc-linux-gnu Target: i686-pc-linux-gnu Build: i686-pc-linux-gnu When adding, subtracting or multiplying two integers and assigning the result to a variable with smaller size, trap on overflow doesn't happen. See for example this program: #include <stdio.h> int main(void) { int a = 0x70000000; int b = 0x50000000; short c = a + b; printf("%x\n", c); return 0; } We compile the program without optimization and with -ftrapv, so that it should crash because of integer overflow. But the program doesn't crash. If we replace "short" with "int", an overflow crash happens correctly.
next reply other threads:[~2012-10-07 16:13 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-10-07 16:13 mikulas at artax dot karlin.mff.cuni.cz [this message] 2012-10-08 10:44 ` [Bug middle-end/54848] " rguenth at gcc dot gnu.org 2024-05-20 0:24 ` bruno at clisp dot org
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