15.9. __nv_fp4_e2m1

struct __nv_fp4_e2m1

__nv_fp4_e2m1 datatype

This structure implements the datatype for handling fp4 floating-point numbers of e2m1 kind: with 1 sign, 2 exponent, 1 implicit and 1 explicit mantissa bits. This encoding does not support Inf/NaN.

The structure implements converting constructors and operators.

Public Functions

__host__ __device__ inline __nv_fp4_e2m1(): Constructor by default.

__host__ __device__ inline explicit __nv_fp4_e2m1(const __half f): Constructor from __half data type, relies on __NV_SATFINITE behavior for out-of-range values and cudaRoundNearest rounding mode.

__host__ __device__ inline explicit __nv_fp4_e2m1(const __nv_bfloat16 f): Constructor from __nv_bfloat16 data type, relies on __NV_SATFINITE behavior for out-of-range values and cudaRoundNearest rounding mode.

__host__ __device__ inline explicit __nv_fp4_e2m1(const double f): Constructor from double data type, relies on __NV_SATFINITE behavior for out-of-range values and cudaRoundNearest rounding mode.

__host__ __device__ inline explicit __nv_fp4_e2m1(const float f): Constructor from float data type, relies on __NV_SATFINITE behavior for out-of-range values and cudaRoundNearest rounding mode.

__host__ __device__ inline explicit __nv_fp4_e2m1(const int val): Constructor from int data type, relies on __NV_SATFINITE behavior for out-of-range values.

__host__ __device__ inline explicit __nv_fp4_e2m1(const long int val): Constructor from long int data type, relies on __NV_SATFINITE behavior for out-of-range values.

__host__ __device__ inline explicit __nv_fp4_e2m1(const long long int val): Constructor from long long int data type, relies on __NV_SATFINITE behavior for out-of-range values.

__host__ __device__ inline explicit __nv_fp4_e2m1(const short int val): Constructor from short int data type.

__host__ __device__ inline explicit __nv_fp4_e2m1(const unsigned int val): Constructor from unsigned int data type, relies on __NV_SATFINITE behavior for out-of-range values.

__host__ __device__ inline explicit __nv_fp4_e2m1(const unsigned long int val): Constructor from unsigned long int data type, relies on __NV_SATFINITE behavior for out-of-range values.

__host__ __device__ inline explicit __nv_fp4_e2m1(const unsigned long long int val): Constructor from unsigned long long int data type, relies on __NV_SATFINITE behavior for out-of-range values.

__host__ __device__ inline explicit __nv_fp4_e2m1(const unsigned short int val): Constructor from unsigned short int data type, relies on __NV_SATFINITE behavior for out-of-range values.

Public Members

__nv_fp4_storage_t __x: Storage variable contains the fp4 floating-point data.