pragma SDS data zero_copy

Description

Tip:Refer to pragma SDS data copyfor a complete description of the zero_copypragma.

TheCOPYpragma implies that data is explicitly copied between the host processor memory and the hardware function, using a suitable data mover for the transfer. TheZERO_COPYpragma means that the hardware function accesses the data directly from shared memory through an AXI master bus interface.

Example 1

The following example shows a ZERO_COPY pragma with multiple arrays specified to generate a direct memory interface with DDR and the hardware function: 
#pragma SDS data zero_copy(in1[0:mat_dim*mat_dim], in2[0:mat_dim*mat_dim], out[0:mat_dim*mat_dim]) void matmul_partition_accel(int *in1, // Read-Only Matrix 1 int *in2, // Read-Only Matrix 2 int *out, // Output Result int mat_dim); // Matrix Dim (assumed only square matrix) { ... }

See Also