In the section entitled "Integer vs. Floating-Point Operations in GPUs" of this article, they claim that
Turing moves to concurrent execution of FP32 and INT32 operations, whereas Pascal would suffer a pipeline stall when an INT operation had to be calculated. Now, rather than stall the FPUs to allow a single INT operation to execute, they can execute simultaneously. This is allowed by independent datapaths for both the integer and floating-point units.
This could be exploited by having part of a fixnum stored with integer base and part with float base. Or interleave calculations on two fixnums, one with integer base and one with float base.
In the section entitled "Integer vs. Floating-Point Operations in GPUs" of this article, they claim that
This could be exploited by having part of a fixnum stored with integer base and part with float base. Or interleave calculations on two fixnums, one with integer base and one with float base.