WriteGmByPassDCache(ISASI)

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

Writes data to the global memory address without passing through the DCache.

When multiple cores operate the global memory address, if the data cannot be aligned to the cache line, random overwriting of multi-core data may occur because data is read and written based on the cache line size when the DCache is used. In this case, you can directly read and write the global memory address without using the DCache to avoid random overwriting.

Prototype

template <typename T>
__aicore__ inline void WriteGmByPassDCache(__gm__ T* addr, T value)

Parameters

**Table 1** Template parameters
Parameter	Description
T	Operand data type. For the Atlas 350 Accelerator Card, the supported data types are int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, int64_t, and uint64_t.

**Table 2** API parameters
Parameter	Input/Output	Meaning
addr	Input	Target global memory address.
value	Input	Target data to be written.

Returns

None

Constraints

None

Example

__gm__ int32_t* addr = dstGlobal.GetPhyAddr();
int32_t value = 2;
WriteGmByPassDCache(addr, value);

Parent topic: Scalar Computation