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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/51821] [4.5/4.6/4.7 Regression] 64bit > 32bit conversion produces incorrect results with optimizations Date: Wed, 11 Jan 2012 11:21:00 -0000 [thread overview] Message-ID: <bug-51821-4-1KBRQV3d43@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-51821-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51821 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |i?86-*-* Status|UNCONFIRMED |NEW Last reconfirmed| |2012-01-11 Known to work| |4.4.6 Target Milestone|--- |4.5.4 Summary|64bit > 32bit conversion |[4.5/4.6/4.7 Regression] |produces incorrect results |64bit > 32bit conversion |with optimizations |produces incorrect results | |with optimizations Ever Confirmed|0 |1 Known to fail| |4.5.3, 4.6.2, 4.7.0 --- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-11 11:21:25 UTC --- Confirmed. Reduced testcase: extern void abort (void); unsigned int __attribute__((noinline,noclone)) test(unsigned int shift_size) { unsigned long long res = 0; res = ~res; res = res << shift_size; return res; } int main() { unsigned int dst = sizeof (unsigned int) * 8; if (test(dst) != 0) abort (); return 0; }
next prev parent reply other threads:[~2012-01-11 11:21 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-01-11 11:02 [Bug c/51821] New: " nos.utelsystems at gmail dot com 2012-01-11 11:21 ` rguenth at gcc dot gnu.org [this message] 2012-01-11 11:28 ` [Bug target/51821] [4.5/4.6/4.7 Regression] " rguenth at gcc dot gnu.org 2012-01-11 12:34 ` ubizjak at gmail dot com 2012-01-11 13:13 ` ubizjak at gmail dot com 2012-01-11 13:21 ` [Bug rtl-optimization/51821] " ubizjak at gmail dot com 2012-01-11 14:15 ` ubizjak at gmail dot com 2012-01-11 22:03 ` ebotcazou at gcc dot gnu.org 2012-01-11 22:35 ` ubizjak at gmail dot com 2012-01-11 22:57 ` ubizjak at gmail dot com 2012-01-12 7:44 ` ebotcazou at gcc dot gnu.org 2012-01-12 8:04 ` ubizjak at gmail dot com 2012-01-12 11:18 ` ebotcazou at gcc dot gnu.org 2012-01-12 11:35 ` ubizjak at gmail dot com 2012-01-12 11:42 ` ubizjak at gmail dot com 2012-01-12 13:20 ` ebotcazou at gcc dot gnu.org 2012-01-12 17:01 ` ubizjak at gmail dot com 2012-01-12 17:36 ` ubizjak at gmail dot com 2012-01-12 19:18 ` ubizjak at gmail dot com 2012-01-15 18:45 ` uros at gcc dot gnu.org 2012-01-15 20:02 ` uros at gcc dot gnu.org 2012-01-15 20:38 ` uros at gcc dot gnu.org 2012-01-15 21:01 ` uros at gcc dot gnu.org 2012-01-15 21:14 ` ubizjak at gmail dot com
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