Function cusolverDnGetFixedPointEmulationMantissaBitOffset 

pub unsafe extern "C" fn cusolverDnGetFixedPointEmulationMantissaBitOffset(
    handle: cusolverDnHandle_t,
    mantissaBitOffset: *mut c_int,
) -> cusolverStatus_t

This function queries the mantissa bit offset for fixed point FP64 emulation in case of dynamic mantissa control mode.

The mantissa bit offset, which is returned by this API only has an effect, once one of the following math modes is enabled (see also cusolverMathMode_t):

• cusolverMathMode_t::CUSOLVER_FP64_EMULATED_FIXEDPOINT_MATH
• cusolverMathMode_t::CUSOLVER_FP32_FP64_EMULATED_MATH

And the following mantissa control is enabled (see also cusolverDnSetFixedPointEmulationMantissaControl):

• CUDA_EMULATION_MANTISSA_CONTROL_DYNAMIC

Please note that values of mantissaBitOffset which are unequal to zero require the mantissa control to be equal to CUDA_EMULATION_MANTISSA_CONTROL_DYNAMIC. Otherwise, the computational cuSOLVER routines will return cusolverStatus_t::CUSOLVER_STATUS_INVALID_VALUE, indicating an unsupported handle state.

cusolverStatus_t::CUSOLVER_STATUS_SUCCESS: The mantissa bit offset was queried successfully.

cusolverStatus_t::CUSOLVER_STATUS_NOT_INITIALIZED: The library was not initialized.

cusolverStatus_t::CUSOLVER_STATUS_INVALID_VALUE: mantissaBitOffset is a NULL pointer.

Parameters

• handle: Handle to the cuSolverDN library context.
• mantissaBitOffset: The mantissa bit offset used when CUDA_EMULATION_MANTISSA_CONTROL_DYNAMIC is in use.

Return value

• cusolverStatus_t::CUSOLVER_STATUS_INVALID_VALUE: mantissaBitOffset is a NULL pointer.
• cusolverStatus_t::CUSOLVER_STATUS_NOT_INITIALIZED: The library was not initialized.
• cusolverStatus_t::CUSOLVER_STATUS_SUCCESS: The mantissa bit offset was queried successfully.