[Pkg-opencl-devel] Bug#768090: beignet: pow(n), erf(c), tgamma give wrong results

[Rebecca N. Palmer]

Package: beignet
Version: 0.9.3~dfsg-1
Severity: serious
Justification: a math library should NOT silently give wrong answers
Control: found -1 0.8-1.1
Control: tags -1 upstream patch

In current beignet (0.8, 0.9.3 and upstream-HEAD):
-pow/pown ignore the sign of their first argument (e.g. pow(-2,3) gives 
8 instead of -8)
-erf/erfc diverge (instead of converging to 1 or 0) for arguments above 
about 2
-tgamma is actually lgamma, a related but very different function (and 
the test suite doesn't notice because it checks against glibc's gammaf, 
which is also lgamma, instead of tgammaf)
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