A kernel can contain multipleprintf instructions executed by multiple work-items. If a kernel specifies the reqd_work_group_size ormax_work_group_sizeattribute, wait_group_events supports the corresponding number of work-items. Best Practices Guide for tips on how to optimize kernel performance using these kernel attributes. Best Practices Guide for tips on using #pragma unroll to improve kernel performance.
The memory configuration that is defined by the variable-specific attributes exceeds the available storage size . errors out or issues warnings if it detects unsupported usages of the variable-specific attributes or incorrect memory configurations. If you specify the numbanks attribute without the bank_bits attribute, the compiler automatically infers the bank-select bits based on the memory access pattern. numbanks Specifies that the memory system implementing the variable or array must have N banks, where N is a power-of-2 integer value greater than zero. bankwidth Specifies that the memory system implementing the variable or array must have banks that are N bytes wide, where N is a power-of-2 integer value greater than zero.
This line of code directs the offline compiler to insert at least two registers on the assignment path. The offline compiler may insert more than two registers on the path. to insert at least one hardware pipelining register on the signal path that assigns the operand to the return value. This built-in function operates as an assignment in the OpenCL programming language, where the operand is assigned to the return value. The assignment has no implicit semantic or functional meaning beyond a standard C assignment.
Updated the instruction to accessing the design example in Using an OpenCL Library that Works with Simple Functions . Minor update in the instructions and removed a note related to legacy emulator in the Debugging Your OpenCL Kernel on Linux. Added a note about emulation performance expectations in the Emulating and Debugging Your OpenCL Kernel topic. If you make a call to an unsupported API, the call returns with an error code to indicate that the API is not fully supported. You can use printfinstructions inside if-then-elsestatements, loops, and so on.
The num_compute_units attribute accepts up to three arguments (that is, num_compute_units). In conjunction with the get_compute_id() function, this attribute allows you to create one-dimensional, two-dimensional, and three-dimensional logical arrays of compute units. An example use case of a 1D array of compute units is a linear pipeline of kernels . An example use case of a 2D array of compute units is a systolic array of kernels.
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Functionally, you can think of the __fpga_reg() function being always optimized away recommended site by the offline compiler. Reduce the pressure on placement and routing efforts caused by spatially distinct portions of the kernel implementation. Break the critical paths between spatially distant portions of a data path, such as between processing elements of a large systolic array. The example code below implements channels within multiple compute units.
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You can replicate your single work-item OpenCL kernel by including the num_compute_units kernel attribute. to omit the generation of unnecessary hardware to increase efficiency. includes kernel attributes that you can include in a single work-item kernel to reduce logic utilization and improve kernel performance. The bank width is smaller than the data access size (for example, bank width is 2 bytes for an array of 4-byte integers).