On Fri, Feb 24, 2017 at 06:43:20PM -0800, Thomas Turner wrote: > 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. try this: ./configure --cc='ccache gcc' --enable-debug=3 --arch=x86_32 --target-os=linux --extra-cflags=-m32 --extra-ldflags=-m32 --enable-cross-compile [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Observe your enemies, for they first find out your faults. -- Antisthenes
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