The size of this buffer is 64 kB; the total size of data arguments to a printf call should not exceed this size. When kernel execution completes, the contents of the printf buffer are printed to standard output. Section 7 of the OpenCL Specification version 1.0 describes features of the C99 and IEEE 754 standards that OpenCL™-compliant devices must support.
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The implementation of kernel copies is functionally equivalent to defining four separate kernels in your source code and then hard-coding unique indexes for the accesses to chain_channels. The get_compute_id() function then retrieves these unique compute IDs. You can use the compute ID to specify how the associated compute unit should behave differently from the other compute units that are derived from the same kernel source code. For example, you can use the return value of get_compute_id()to index into an array of channels to specify which channel each compute unit should read from or write to. To create compute units that are slightly different from one another but share a lot of common code, call the get_compute_id() intrinsic function in a kernel that also uses the num_compute_units attribute.
Feature Support Status Notes structure-type kernel arguments X Convert structure arguments to a pointer to a structure in global memory. irreducible control flow X The offline compiler returns a diagnostic error for this restriction, but this feature is not supported. writes to memory of built-in types less than 32 bits in size ○ Store operations less than 32 bits in size might result in lower memory performance but are supported.
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Because each function call guarantees the insertion of at least one register stage, the number of calls provides a lower limit on the number of registers. where T may be any sized type, such as standard OpenCL device data types, or a user-defined struct containing OpenCL types. software performing advanced optimization for a specific target device.
host runtime conforms with the OpenCL platform layer and application programming interface , with clarifications and exceptions. You Gameboy Advance emulator may introduce nested __fpga_reg()function calls in your kernel code to increase the minimum number of registers that the offline compiler inserts on the assignment path.
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However, the order of concurrent printf execution is not guaranteed. In other words, printf outputs might not appear in program order if the printf instructions are in concurrent datapaths. Format string arguments and literal string arguments of printf calls are transferred to the host system from the FPGA using a special memory region. This memory region can overflow if the total size of the printf string arguments is large . If there is an overflow, the error messagecannot parse auto-discovery string at byte offset 4096 is printed during host program execution.
You must have sufficient knowledge about the placement of portions of the data path on the FPGA. In general, it is not necessary to include the __fpga_reg() function in your kernel code to achieve desired performance.
elements of a struct or a union belonging to different address spaces X The offline compiler does not enforce this restriction. does not enforce restrictions on certain disallowed programming language features. Ensure that your kernel code does not contain features that the OpenCL Specification version 1.0 does not support.