Looks like a gcc optimization problem (clang works correctly). Using ‘-Ofast’ with gcc 5.3 reproduces the bug. Using ‘-O3’ works fine.
So one of the options down here caused the bug: -fassociative-math -fcx-limited-range -ffinite-math-only -fmath-errno -freciprocal-math -fsigned-zeros -ftrapping-math -funsafe-math-optimizations I’ll see if I can pin down exactly which one. Do you have any idea what could be the culprit? - Xiao-Yong > On Apr 13, 2016, at 1:01 PM, Juergen Sauermann > <juergen.sauerm...@t-online.de> wrote: > > Hi Xiao, > > interesting. I am still getting this in *SVN**719*: > > * 8 ¯8⋆÷3 > 2 1J1.732050808* > > /// Jürgwn > > > On 04/13/2016 03:42 AM, Xiao-Yong Jin wrote: >> Hi, >> >> With the svn version 719, >> >> 8 ¯8⋆÷3 >> 2 0.000000000 >> >> but with the release version 1.5, >> >> 8 ¯8⋆÷3 >> 2 1J1.732050808 >> >> Best, >> Xiao-Yong >> >> >> >
