[Pocl-devel] OpenCL 1.2 specs published

[Pekka J. <pek...@tu...>]

Hi,

Some interesting additions to the OpenCL standard in the newly
released 1.2:

* Built-in Kernel: A built-in kernel is a kernel that is executed on an OpenCL
device or custom device by fixed-function hardware or in firmware.
Applications can query the built-in kernels supported by a device or custom
device. A program object can only contain kernels written in OpenCL C or
built-in kernels but not both. See also Kernel and Program.

Fits the OpenCL to TTA-ASIP case quite well... one can have highly tuned
implementations of some kernels embedded in the FPGA/ROM of the ASIP and
exploit them from the host program in a standard way.

* printf is now in the main specs with specified behavior

The printf built-in function writes output to an implementation-defined
stream such as stdout under control of the string pointed to by format
that specifies how subsequent arguments are converted for output. If there are
insufficient arguments for the format, the behavior is undefined. If the
format is exhausted while arguments remain, the excess arguments are
evaluated (as always) but are otherwise ignored. The printf function
returns when the end of the format string is encountered.
...When the event that is associated
with a particular kernel invocation is completed, the output of all printf()
calls executed by this kernel invocation is flushed to the implementation-
defined output stream. Calling clFinish on a command queue flushes all pending 
output by printf in previously enqueued and completed commands to
the implementation-defined output stream...

You can query the printf "buffer" size in the device.

"Maximum size of the internal buffer that holds the output of printf calls
from a kernel. The minimum value for the EMBEDDED profile is 1 KB."

* support for separated linkage phase

Storage class specifiers 'extern' and 'static' are now keywords..


-- 
Pekka