Hi All, Update: Now have a working copy SVN revision 1353 compiler to use. The uint64 multiplication problem mentioned seems to have gone away now. Will report if I have any further trouble.
Cheers, -- Matt. Matthew Kille wrote: > Hi All, > > I'm seeing some problems with 64-bit integer multiplication when using > the optimiser. Can somebody confirm whether there are any known problems? > > I have created a minimal test program to hopefully demonstrate the > issue, (see attached). The program does the same multiply twice; first > time to show the result we are expecting, and the second time using a > little extra code to force the optimiser into having to do some > non-trivial work. > > The output is written to a file in the root. The results should clearly > be the same each case, but with optimisation enabled the results are as > follows: > > a = 1000 > b = 4294967295 > a * b = 4294967295000 > > a = 1000 > b = 4294967295 > a * b = 18446744073709550616 > > (0x3e7fffffc18 compared to 0xfffffffffffffc18). > > Looks like the most significant word is being miscalculated. With > optimisation switched off -O0 or a different value for 'b' the second > answer is correct, matching the first. > > I'm using the 0.51 release. I haven't been able to test with 0.55 (no > Cygwin release) and the latest SVN sources have trouble building. > > $ arm-wince-mingw32ce-gcc -v > Using built-in specs. > Target: arm-wince-mingw32ce > Configured with: /home/pedro/cegcc/0.51/src/gcc/configure --with-gcc > --with-gnu-ld --with-gnu-as --target=arm-wince-mingw32ce > --prefix=/opt/mingw32ce --enable-threads=win32 --disable-nls > --enable-languages=c,c++ --disable-win32-registry --disable-multilib > --disable-interwork --without-newlib --enable-checking --with-headers > Thread model: win32 > gcc version 4.1.0 > > I would be pleased for any guidance on this matter and indeed whether > others experience the same thing. > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > > > ------------------------------------------------------------------------ > > _______________________________________________ > Cegcc-devel mailing list > Cegcc-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/cegcc-devel ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Cegcc-devel mailing list Cegcc-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/cegcc-devel
