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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/58431] New: wrong code at -O3 on x86_64-linux-gnu (in 32-bit mode) Date: Mon, 16 Sep 2013 06:56:00 -0000 [thread overview] Message-ID: <bug-58431-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58431 Bug ID: 58431 Summary: wrong code at -O3 on x86_64-linux-gnu (in 32-bit mode) Product: gcc Version: 4.9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: su at cs dot ucdavis.edu The current gcc trunk mis-compiles the following code on x86_64-linux at -O3 in 32-bit mode. This is a regression from 4.8.x. $ gcc-trunk -v Using built-in specs. COLLECT_GCC=gcc-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../gcc-trunk/configure --enable-languages=c,c++,objc,obj-c++,fortran,lto --with-gmp=/usr/local/gcc-trunk --with-mpfr=/usr/local/gcc-trunk --with-mpc=/usr/local/gcc-trunk --with-cloog=/usr/local/gcc-trunk --prefix=/usr/local/gcc-trunk Thread model: posix gcc version 4.9.0 20130915 (experimental) [trunk revision 202599] (GCC) $ gcc-trunk -m32 -O2 small.c $ a.out $ gcc-4.8 -m32 -O3 small.c $ a.out $ gcc-trunk -m32 -O3 small.c $ a.out Aborted (core dumped) $ --------------------------------------- char a, h; int b, d, e, g, j, k; volatile int c; short i; int main () { int m = i ^= 1; for (b = 0; b < 1; b++) { char o = m; g = k; j = j || c; if (a != o) for (; d < 1; d++) ; else { char *p = &h; *p = 1; for (; e; e++) ; } } if (h != 0) __builtin_abort(); return 0; }
next reply other threads:[~2013-09-16 6:56 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-09-16 6:56 su at cs dot ucdavis.edu [this message] 2013-09-16 7:34 ` [Bug tree-optimization/58431] [4.9 Regression] " jakub at gcc dot gnu.org 2013-09-16 18:37 ` law at redhat dot com 2013-09-16 19:28 ` glisse at gcc dot gnu.org 2013-09-16 19:29 ` law at redhat dot com
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