On Wed, Feb 22, 2017 at 2:16 PM, Michael Niedermayer <mich...@niedermayer.cc > wrote:
> oops forgot to reply to all, this one went only to thomas by mistake > > On Tue, Feb 21, 2017 at 08:12:57PM -0800, Thomas Turner wrote: > > > > > > On 02/17/2017 02:15 PM, Michael Niedermayer wrote: > > > On Thu, Feb 16, 2017 at 08:29:38PM -0800, Thomas Turner wrote: > > >> The Chen-Shapiro(CS) test was used to test normality for > > >> Lagged Fibonacci PRNG. > > >> > > >> Normality Hypothesis Test: > > >> > > >> The null hypothesis formally tests if the population > > >> the sample represents is normally-distributed. For > > >> CS, when the normality hypothesis is True, the > > >> distribution of QH will have a mean close to 1. > > >> > > >> Information on CS can be found here: > > >> > > >> http://www.stata-journal.com/sjpdf.html?articlenum=st0264 > > >> http://www.originlab.com/doc/Origin-Help/NormalityTest-Algorithm > > >> > > >> Signed-off-by: Thomas Turner <thomas...@googlemail.com> > > >> --- > > >> libavutil/tests/lfg.c | 170 ++++++-- > > >> tests/fate/libavutil.mak | 4 + > > >> tests/ref/fate/lfg | 1007 ++++++++++++++++++++++++++++++ > ++++++++++++++++ > > >> 3 files changed, 1157 insertions(+), 24 deletions(-) > > >> create mode 100644 tests/ref/fate/lfg > > > > > > works on x86_64 linux but fails on x86_32 > > > > What if we force gcc compiler to use IEEE 754 floating-point > semantics...Will adding the following gcc compilation flags to ffmpeg > configuration allow the test to pass? : -msse2 -mfpmath=sse > > there is no gurantee that the hardware this runs on supports sse > nor that the compiler is gcc > > C has a somewhat loose definition of floating point operations, > that allows C compilers to perform more optimizations and run on more > hardware. There isnt much that can be done about this, short of not > using floating point > > But why does it not work with default options? > x86_32 machine produces a negative overflow for double precision value. But unable to figure out precisely why. my guesstimation would be because of the difference in floating point arithmetic. > or is that unknown ? > did you succeed in reproduring the issue ? > trying to compile 32bit on my 64bit machine with: ./configure --enable-debug=3 --cc='cc -m32' but i get the following error: cc -m32 is unable to create an executable file. If cc -m32 is a cross-compiler, use the --enable-cross-compile option. Only do this if you know what cross compiling means. C compiler test failed. > [...] > > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > There will always be a question for which you do not know the correct > answer. > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
