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From: "chenyang at cs dot utah dot edu" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/42006] New: Termination problem with -O2 and -O3 Date: Wed, 11 Nov 2009 06:29:00 -0000 [thread overview] Message-ID: <bug-42006-18350@http.gcc.gnu.org/bugzilla/> (raw) Using r154087, the code below never terminates with -O2 and -O3. yang@yang-working:~$ svngcc -O2 -o small2 small.c yang@yang-working:~$ ./small2 1 1 ... yang@yang-working:~$ ./small1 1 2 exit! yang@yang-working:~$ cat small.c #include <stdio.h> static int my_add(int si1, int si2) { return (si1 > (50-si2)) ? si1 : (si1 + si2); } static unsigned int my_shift(unsigned int left, int right) { return (right > 100) ? left : (left >> right); } static int func_4(unsigned int p_6) { for (p_6 = 1; p_6 < 3; p_6 = my_add(p_6, 1)) { printf ("%d\n", p_6); if (my_shift(p_6, p_6)) { return 0; } } return 0; } int main(void) { func_4(0); printf("exit!\n"); return 0; } yang@yang-working:~$ svngcc -v Using built-in specs. COLLECT_GCC=svngcc COLLECT_LTO_WRAPPER=/home/yang/compilers/libexec/gcc/i686-pc-linux-gnu/4.5.0/lto-wrapper Target: i686-pc-linux-gnu Configured with: ../configure --enable-lto --prefix=/home/yang/compilers --program-prefix=svn --enable-languages=c,c++ --with-libelf=/home/yang/compilers : (reconfigured) ../configure --enable-lto --prefix=/home/yang/compilers --program-prefix=svn --with-libelf=/home/yang/compilers --enable-languages=c,lto,c++ --no-create --no-recursion : (reconfigured) ../configure --enable-lto --prefix=/home/yang/compilers --program-prefix=svn --with-libelf=/home/yang/compilers --enable-languages=c,c++,lto --no-create --no-recursion : (reconfigured) ../configure --enable-lto --prefix=/home/yang/compilers --program-prefix=svn --with-libelf=/home/yang/compilers --enable-languages=c,c++,lto --no-create --no-recursion : (reconfigured) ../configure --enable-lto --prefix=/home/yang/compilers --program-prefix=svn --with-libelf=/home/yang/compilers --enable-languages=c,c++,lto --no-create --no-recursion Thread model: posix gcc version 4.5.0 20091110 (experimental) (GCC) -- Summary: Termination problem with -O2 and -O3 Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: chenyang at cs dot utah dot edu GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42006
next reply other threads:[~2009-11-11 6:29 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2009-11-11 6:29 chenyang at cs dot utah dot edu [this message] 2009-11-11 20:35 ` [Bug c/42006] [4.5 Regression] " rguenth at gcc dot gnu dot org 2009-11-27 11:18 ` [Bug middle-end/42006] " rguenth at gcc dot gnu dot org 2009-11-27 14:18 ` rguenth at gcc dot gnu dot org 2009-11-27 18:46 ` jamborm at gcc dot gnu dot org 2009-11-27 22:35 ` jamborm at gcc dot gnu dot org 2009-11-27 22:35 ` jamborm at gcc dot gnu dot org 2009-12-11 23:39 ` hjl at gcc dot gnu dot org
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