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* [Bug c/45817] New: __aeabi_uidiv broken when built with -Os (5/3 == 3)
@ 2010-09-28 15:25 enrico.scholz at informatik dot tu-chemnitz.de
2010-09-28 16:04 ` [Bug c/45817] " mikpe at it dot uu.se
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: enrico.scholz at informatik dot tu-chemnitz.de @ 2010-09-28 15:25 UTC (permalink / raw)
To: gcc-bugs
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: unassigned@gcc.gnu.org
ReportedBy: enrico.scholz@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)
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/45817] __aeabi_uidiv broken when built with -Os (5/3 == 3)
2010-09-28 15:25 [Bug c/45817] New: __aeabi_uidiv broken when built with -Os (5/3 == 3) enrico.scholz at informatik dot tu-chemnitz.de
@ 2010-09-28 16:04 ` mikpe at it dot uu.se
2010-09-28 16:54 ` [Bug target/45817] " pinskia at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: mikpe at it dot uu.se @ 2010-09-28 16:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45817
Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mikpe at it dot uu.se
--- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> 2010-09-28 12:25:22 UTC ---
It appears to be --enable-target-optspace that's broken, not -Os. With
--enable-target-optspace lib1funcs.asm is compiled with __OPTIMIZE_SIZE__,
which selects a different definition for the ARM_DIV_BODY macro than the
default one. It seems the other definition is broken for this case.
Without --enable-target-optspace I get the correct result (1) with 4.4/4.5/4.6.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/45817] __aeabi_uidiv broken when built with -Os (5/3 == 3)
2010-09-28 15:25 [Bug c/45817] New: __aeabi_uidiv broken when built with -Os (5/3 == 3) enrico.scholz at informatik dot tu-chemnitz.de
2010-09-28 16:04 ` [Bug c/45817] " mikpe at it dot uu.se
@ 2010-09-28 16:54 ` pinskia at gcc dot gnu.org
2010-09-28 19:55 ` enrico.scholz at informatik dot tu-chemnitz.de
2010-09-28 20:05 ` enrico.scholz at informatik dot tu-chemnitz.de
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2010-09-28 16:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45817
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c |target
Severity|critical |normal
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/45817] __aeabi_uidiv broken when built with -Os (5/3 == 3)
2010-09-28 15:25 [Bug c/45817] New: __aeabi_uidiv broken when built with -Os (5/3 == 3) enrico.scholz at informatik dot tu-chemnitz.de
2010-09-28 16:04 ` [Bug c/45817] " mikpe at it dot uu.se
2010-09-28 16:54 ` [Bug target/45817] " pinskia at gcc dot gnu.org
@ 2010-09-28 19:55 ` enrico.scholz at informatik dot tu-chemnitz.de
2010-09-28 20:05 ` enrico.scholz at informatik dot tu-chemnitz.de
3 siblings, 0 replies; 5+ messages in thread
From: enrico.scholz at informatik dot tu-chemnitz.de @ 2010-09-28 19:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45817
--- Comment #2 from enrico.scholz at informatik dot tu-chemnitz.de 2010-09-28 16:49:57 UTC ---
sorry; my fault. Caused by broken patch for #43999
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/45817] __aeabi_uidiv broken when built with -Os (5/3 == 3)
2010-09-28 15:25 [Bug c/45817] New: __aeabi_uidiv broken when built with -Os (5/3 == 3) enrico.scholz at informatik dot tu-chemnitz.de
` (2 preceding siblings ...)
2010-09-28 19:55 ` enrico.scholz at informatik dot tu-chemnitz.de
@ 2010-09-28 20:05 ` enrico.scholz at informatik dot tu-chemnitz.de
3 siblings, 0 replies; 5+ messages in thread
From: enrico.scholz at informatik dot tu-chemnitz.de @ 2010-09-28 20:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45817
enrico.scholz at informatik dot tu-chemnitz.de changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #3 from enrico.scholz at informatik dot tu-chemnitz.de 2010-09-28 16:51:57 UTC ---
closing
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2010-09-28 16:52 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-09-28 15:25 [Bug c/45817] New: __aeabi_uidiv broken when built with -Os (5/3 == 3) enrico.scholz at informatik dot tu-chemnitz.de
2010-09-28 16:04 ` [Bug c/45817] " mikpe at it dot uu.se
2010-09-28 16:54 ` [Bug target/45817] " pinskia at gcc dot gnu.org
2010-09-28 19:55 ` enrico.scholz at informatik dot tu-chemnitz.de
2010-09-28 20:05 ` enrico.scholz at informatik dot tu-chemnitz.de
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