__umulhi

Applicability

Product	Supported
Atlas 350 Accelerator Card	√
Atlas A3 training product/Atlas A3 inference product	x
Atlas A2 training product/Atlas A2 inference product	x
Atlas 200I/500 A2 inference product	x
Atlas inference product AI Core	x
Atlas inference product Vector Core	x
Atlas training product	x

Function Usage

Obtains the upper 32 bits of the product of two uint32 inputs, x and y.

$\text{[math]}$

Prototype

unsigned int __umulhi(unsigned int x, unsigned int y)

Parameters

**Table 1** Parameters
Parameter	Input/Output	Description
x	Input	Source operand, multiplier.
y	Input	Source operand, multiplier.

Returns

The upper 32 bits of the product of two uint32 inputs, x and y.

Restrictions

For SIMT programming, this API is not supported.

Header File to Be Included

To use this API, the simt_api/device_functions.h header file must be included.

Examples

For SIMD and SIMT programming:

__simt_vf__ __launch_bounds__(1024) inline void KernelUmulhi(__gm__ unsigned int* dst, __gm__ unsigned int* x, __gm__ unsigned int* y)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = __umulhi(x[idx], y[idx]);
}

Parent topic: Mathematical Functions