История изменений

http://www.gpgpu.org/static/sc2006/workshop/Apple_GPUintrinsics.pdf

Current GPUs do not support double-precision computation and their single-precision support glosses over important aspects of the IEEE-754 floating-point standard[1], such as correctly rounded results and proper closure of the number system. ... Our results show that there are serious errors with the GPUs' results at certain edge cases, in addition to the incorrect handling of denormalized numbers.

https://en.wikipedia.org/wiki/CUDA#Limitations

Double precision (CUDA compute capability 1.3 and above)[14] deviate from the IEEE 754 standard: round-to-nearest-even is the only supported rounding mode for reciprocal, division, and square root. In single precision, denormals and signalling NaNs are not supported; only two IEEE rounding modes are supported (chop and round-to-nearest even), and those are specified on a per-instruction basis rather than in a control word; and the precision of division/square root is slightly lower than single precision.

PS: нагло украл со stackoverflow

http://www.gpgpu.org/static/sc2006/workshop/Apple_GPUintrinsics.pdf
https://en.wikipedia.org/wiki/CUDA#Limitations