http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45817
Summary: __aeabi_uidiv broken when built with -Os (5/3 == 3) Product: gcc Version: 4.5.2 Status: UNCONFIRMED Severity: critical Priority: P3 Component: c AssignedTo: unassig...@gcc.gnu.org ReportedBy: enrico.sch...@informatik.tu-chemnitz.de int main(int argc, char *argv[]) { unsigned int volatile a = 5; unsigned int volatile b = 3; __asm__ __volatile__("" ::: "memory"); return a/b; } $ arm-linux-gnueabi-gcc -O0 m.c --- # /a.out ; echo $? 3 Implementation of uidiv in gcc/config/arm/lib1funcs.asm differs depending on the -Os flag (which is used by me) and issue might be missed by regression tests which were run with non -Os compilers. ------------------ $ LANG=C arm-linux-gnueabi-gcc -v Using built-in specs. COLLECT_GCC=arm-linux-gnueabi-gcc COLLECT_LTO_WRAPPER=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/libexec/gcc/arm-linux-gnueabi/4.5.2/lto-wrapper Target: arm-linux-gnueabi Configured with: /srv/projects/elito-ref/COLIBRI270/tmp/work/armv5te-linux-gnueabi/gcc-cross-4.5-r1+svnr163322/gcc-4.5/configure --build=x86_64-linux --host=x86_64-linux --target=arm-linux-gnueabi --prefix=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te --exec_prefix=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te --bindir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/bin --sbindir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/bin --libexecdir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/libexec --datadir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/share --sysconfdir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/etc --sharedstatedir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/com --localstatedir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/var --libdir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/lib --includedir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/include --oldincludedir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/include --infodir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/share/info --mandir=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/share/man --with-gnu-ld --enable-shared --enable-languages=c,c++,objc --enable-threads=posix --disable-multilib --enable-c99 --enable-long-long --enable-symvers=gnu --enable-libstdcxx-pch --program-prefix=arm-linux-gnueabi- --enable-target-optspace --enable-lto --enable-libssp --disable-bootstrap --disable-libgomp --disable-libmudflap --with-abi=aapcs-linux --with-float=soft --with-sysroot=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/armv5te-linux-gnueabi --with-build-sysroot=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/armv5te-linux-gnueabi --with-build-time-tools=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr/armv5te/bin --disable-libunwind-exceptions --with-mpfr=/srv/projects/elito-ref/COLIBRI270/tmp/sysroots/x86_64-linux/usr --with-system-zlib --program-prefix=arm-linux-gnueabi- --enable-__cxa_atexit Thread model: posix gcc version 4.5.2 20100818 (prerelease) (GCC)