Fix and test math precision.

[maleadt]

Fixes #1392

[codecov]

Codecov Report

Merging #1394 (2a1ca4c) into master (3172225) will increase coverage by 0.27%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1394      +/-   ##
==========================================
+ Coverage   77.50%   77.78%   +0.27%     
==========================================
  Files         121      124       +3     
  Lines        8978     9073      +95     
==========================================
+ Hits         6958     7057      +99     
+ Misses       2020     2016       -4     

Impacted Files	Coverage Δ
lib/cudadrv/state.jl	81.35% <0.00%> (+1.81%)	⬆️
src/CUDA.jl	100.00% <0.00%> (ø)
lib/nvtx/NVTX.jl	100.00% <0.00%> (ø)
lib/curand/CURAND.jl	100.00% <0.00%> (ø)
lib/cudnn/descriptors.jl	100.00% <0.00%> (ø)
lib/utils/APIUtils.jl	100.00% <0.00%> (ø)
lib/cupti/CUPTI.jl	100.00% <0.00%> (ø)
lib/cufft/CUFFT.jl	100.00% <0.00%> (ø)
lib/cublas/CUBLAS.jl	76.10% <0.00%> (+0.21%)	⬆️
lib/cusolver/CUSOLVER.jl	83.09% <0.00%> (+0.24%)	⬆️
... and 20 more

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