Re: [flac-dev] Two questions about RG in flac
Ozkan Sezer wrote: > With gcc-3,3,6, 3,4,6, 4.3.0 and gcc-4.9.1 (svn r210839) the output is > normal: > Sum = 64.00 (should be equal to 64) > > With gcc-4.8.3 (release version) it's broken: > Sum = 206158430272.00 (should be equal to 64) > > With clang-3.4.1 (compiled with gcc-4.8.3) the output is normal again. > > This is on i686-linux (fedora9, glibc-2.8, kernel-2.6.27.35) Thank you for testing. However, I compiled my test with gcc 4.9.1 20140604 from dongsheng-daily ( http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/dongsheng-daily/4.9/ , file gcc-4.9-win32_4.9.1-20140604.7z) and it still fails... ___ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev
Re: [flac-dev] Two questions about RG in flac
Robert Kausch wrote: > The problem seems to be that sum is interpreted as a 64 bit value if > SSE2 was used in the loop (the lower 32 bits of the result give the > expected value). If sum is evaluated another time before or after (!) > the printf, the problem goes away. For example, changing the last line > to "return sum + 1;" lets the problem disappear. > > I confirmed the bug with GCC 4.6.3 on Ubuntu. As on Windows, only 32 bit > code generation is affected. Thank you for testing. > You should file a bug report with the GCC team. Done: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61423 ___ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev
