Add __float2half_rn for cuda compute capabilities less than 53 #4489
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Description
When float32 consts are converted to float16,
__float2half_rn
, which is officially defined incuda_fp16.h
and included for cuda compute capabilities >= 53, is invoked. In this PR, the same function is added in cuda code gen for cuda compute capabilities < 53.Tested on sm_37 and sm_70.
Thank @yzhliu for pointers.