table of contents
CLBUILDPROGRAM(3clc) | OpenCL Manual | CLBUILDPROGRAM(3clc) |
NAME¶
clBuildProgram - Builds (compiles and links) a program executable from the program source or binary.¶
cl_int
clBuildProgram(cl_program program,
cl_uint num_devices,
const cl_device_id *device_list,
const char *options,
void (CL_CALLBACK *pfn_notify)(cl_program program, void *user_data),
void *user_data);
PARAMETERS¶
programThe program object.
device_list
A pointer to a list of devices associated with
program. If device_list is NULL value, the program executable is
built for all devices associated with program for which a source or
binary has been loaded. If device_list is a non-NULL value, the program
executable is built for devices specified in this list for which a source or
binary has been loaded.
num_devices
The number of devices listed in device_list.
options
A pointer to a null-terminated string of characters that
describes the build options to be used for building the program executable.
The list of supported options is described below.
pfn_notify
A function pointer to a notification routine. The
notification routine is a callback function that an application can register
and which will be called when the program executable has been built
(successfully or unsuccessfully). If pfn_notify is not NULL,
clBuildProgram does not need to wait for the build to complete and can
return immediately once the build operation can begin. The build operation can
begin if the context, program whose sources are being compiled and linked,
list of devices and build options specified are all valid and appropriate host
and device resources needed to perform the build are available. If
pfn_notify is NULL, clBuildProgram does not return until the
build has completed. This callback function may be called asynchronously by
the OpenCL implementation. It is the application’s responsibility to
ensure that the callback function is thread-safe.
user_data
Passed as an argument when pfn_notify is called.
user_data can be NULL.
NOTES¶
Builds (compiles & links) a program executable from the program source or binary for all the devices or a specific device(s) in the OpenCL context associated with program. OpenCL allows program executables to be built using the source or the binary. clBuildProgram must be called for program created using either clCreateProgramWithSource(3clc) or clCreateProgramWithBinary(3clc) to build the program executable for one or more devices associated with program. If program is created with clCreateProgramWithBinary(3clc), then the program binary must be an executable binary (not a compiled binary or library). The executable binary can be queried using clGetProgramInfo(3clc)(program, CL_PROGRAM_BINARIES, ...) and can be specified to clCreateProgramWithBinary(3clc) to create a new program object. Compiler Options.PP The compiler options are categorized as pre-processor options, options for math intrinsics, options that control optimization and miscellaneous options. This specification defines a standard set of options that must be supported by the OpenCL C compiler when building program executables online or offline. These may be extended by a set of vendor- or platform specific options. Preprocessor Options.PP These options control the OpenCL C preprocessor which is run on each program source before actual compilation. -D options are processed in the order they are given in the options argument to clBuildProgram or or clCompileProgram. -D namePredefine name as a macro, with definition
1.
-D name=definition
The contents of definition are tokenized and
processed as if they appeared during translation phase three in a `#define'
directive. In particular, the definition will be truncated by embedded newline
characters.
-I dir
Add the directory dir to the list of directories
to be searched for header files.
Math Intrinsics Options
These options control compiler behavior regarding floating-point arithmetic.
These options trade off between speed and correctness.
-cl-single-precision-constant
Treat double precision floating-point constant as single
precision constant.
-cl-denorms-are-zero
This option controls how single precision and double
precision denormalized numbers are handled. If specified as a build option,
the single precision denormalized numbers may be flushed to zero; double
precision denormalized numbers may also be flushed to zero if the optional
extension for double precsion is supported. This is intended to be a
performance hint and the OpenCL compiler can choose not to flush denorms to
zero if the device supports single precision (or double precision)
denormalized numbers.
This option is ignored for single precision numbers if the device does not
support single precision denormalized numbers i.e. CL_FP_DENORM bit is
not set in CL_DEVICE_SINGLE_FP_CONFIG.
This option is ignored for double precision numbers if the device does not
support double precision or if it does support double precison but
CL_FP_DENORM bit is not set in CL_DEVICE_DOUBLE_FP_CONFIG.
This flag only applies for scalar and vector single precision floating-point
variables and computations on these floating-point variables inside a program.
It does not apply to reading from or writing to image objects.
-cl-fp32-correctly-rounded-divide-sqrt
The -cl-fp32-correctly-rounded-divide-sqrt build option
to clBuildProgram or clCompileProgram allows an application to
specify that single precision floating-point divide (x/y and 1/x) and sqrt
used in the program source are correctly rounded. If this build option is not
specified, the minimum numerical accuracy of single precision floating-point
divide and sqrt are as defined in section 7.4 of the OpenCL specification.
This build option can only be specified if the
CL_FP_CORRECTLY_ROUNDED_DIVIDE_SQRT is set in
CL_DEVICE_SINGLE_FP_CONFIG (as defined in in the table of allowed
values for param_name for clGetDeviceInfo(3clc)) for devices
that the program is being build. clBuildProgram or
clCompileProgram will fail to compile the program for a device if the
-cl-fp32-correctly-rounded-divide-sqrt option is specified and
CL_FP_CORRECTLY_ROUNDED_DIVIDE_SQRT is not set for the device.
Optimization Options.PP These options control various sorts of optimizations.
Turning on optimization flags makes the compiler attempt to improve the
performance and/or code size at the expense of compilation time and possibly
the ability to debug the program.
-cl-opt-disable
This option disables all optimizations. The default is
optimizations are enabled.
The following options control compiler behavior regarding floating-point
arithmetic. These options trade off between performance and correctness and
must be specifically enabled. These options are not turned on by default since
it can result in incorrect output for programs which depend on an exact
implementation of IEEE 754 rules/specifications for math functions.
-cl-mad-enable
Allow a * b + c to be replaced by a mad. The mad computes
a * b + c with reduced accuracy. For example, some OpenCL devices implement
mad as truncate the result of a * b before adding it to c.
-cl-no-signed-zeros
Allow optimizations for floating-point arithmetic that
ignore the signedness of zero. IEEE 754 arithmetic specifies the distinct
behavior of +0.0 and -0.0 values, which then prohibits simplification of
expressions such as x+0.0 or 0.0*x (even with -clfinite-math only). This
option implies that the sign of a zero result isn't significant.
-cl-unsafe-math-optimizations
Allow optimizations for floating-point arithmetic that
(a) assume that arguments and results are valid, (b) may violate IEEE 754
standard and (c) may violate the OpenCL numerical compliance requirements as
defined in section 7.4 for single precision and double precision
floating-point, and edge case behavior in section 7.5. This option includes
the -cl-no-signed-zeros and -cl-mad-enable options.
-cl-finite-math-only
Allow optimizations for floating-point arithmetic that
assume that arguments and results are not NaNs or ±∞. This
option may violate the OpenCL numerical compliance requirements defined in
section 7.4 for single precision and double precision floating point, and edge
case behavior in section 7.5.
-cl-fast-relaxed-math
Sets the optimization options -cl-finite-math-only and
-cl-unsafe-math-optimizations. This allows optimizations for floating-point
arithmetic that may violate the IEEE 754 standard and the OpenCL numerical
compliance requirements defined in the specification in section 7.4 for
single-precision and double precision floating-point, and edge case behavior
in section 7.5. This option causes the preprocessor macro
__FAST_RELAXED_MATH__ to be defined in the OpenCL program.
Options to Request or Suppress Warnings
Warnings are diagnostic messages that report constructions which are not
inherently erroneous but which are risky or suggest there may have been an
error. The following languageindependent options do not enable specific
warnings but control the kinds of diagnostics produced by the OpenCL compiler.
-w
Inhibit all warning messages.
-Werror
Make all warnings into errors.
Options Controlling the OpenCL C Version
The following option controls the version of OpenCL C that the compiler accepts.
-cl-std=
Determine the OpenCL C language version to use. A value
for this option must be provided. Valid values are:
CL1.1 - Support all OpenCL C programs that use the OpenCL C language features
defined in section 6 of the OpenCL 1.1 specification.
CL1.2 – Support all OpenCL C programs that use the OpenCL C language
features defined in section 6 of the OpenCL 1.2 specification.
Calls to clBuildProgram or clCompileProgram with the -cl-std=CL1.1
option will fail to compile the program for any devices with
CL_DEVICE_OPENCL_C_VERSION = OpenCL C 1.0. Calls to
clBuildProgram or clCompileProgram with the -cl-std=CL1.2 option
will fail to compile the program for any devices with
CL_DEVICE_OPENCL_C_VERSION = OpenCL C 1.0 or OpenCL C 1.1.
If the -cl-std build option is not specified, the
CL_DEVICE_OPENCL_C_VERSION is used to select the version of OpenCL C to
be used when compiling the program for each device. Options for Querying
Kernel Argument Information
-cl-kernel-arg-info
This option allows the compiler to store information
about the arguments of a kernel(s) in the program executable. The argument
information stored includes the argument name, its type, the address and
access qualifiers used. Refer to description of
clGetKernelArgInfo(3clc) on how to query this information.
Linker Options
This specification defines a standard set of linker options that must be
supported by the OpenCL C compiler when linking compiled programs online or
offline. These linker options are categorized as library linking options and
program linking options. These may be extended by a set of vendor- or
platform-specific options.
Library Linking Options
The following options can be specified when creating a library of compiled
binaries.
-create-library
Create a library of compiled binaries specified in
input_programs argument to clLinkProgram(3clc).
-enable-link-options
Allows the linker to modify the library behavior based on
one or more link options (described in Program Linking Options, below) when
this library is linked with a program executable. This option must be
specified with the –create-library option.
Program Linking Options
The following options can be specified when linking a program executable.
•-cl-denorms-are-zero .RE
•-cl-no-signed-zeroes .RE
•-cl-unsafe-math-optimizations .RE
•-cl-finite-math-only .RE
•-cl-fast-relaxed-mat .RE
The linker may apply these options to all compiled program objects specified to
clLinkProgram(3clc). The linker may apply these options only to
libraries which were created with the –enable-link-option.
Separate Compilation and Linking of Programs.PP OpenCL 1.2 extends how programs
are compiled and linked to support the following:
• Separate compilation and link stages. Program
sources can be compiled to generate a compiled binary object and linked in a
separate stage with other compiled program objects to the program
exectuable.
• Embedded headers. In OpenCL 1.0 and 1.1, the
–I build option could be used to specify the list of directories to be
searched for headers files that are included by a program source(s). OpenCL
1.2 extends this by allowing the header sources to come from program objects
instead of just header files.
• Libraries. The linker can be used to link
compiled objects and libraries into a program executable or to create a
library of compiled binarie
ERRORS¶
clBuildProgram returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of the following errors:•CL_INVALID_PROGRAM if program is not a
valid program object.
•CL_INVALID_VALUE if device_list is NULL
and num_devices is greater than zero, or if device_list is not
NULL and num_devices is zero.
•CL_INVALID_VALUE if pfn_notify is NULL but
user_data is not NULL.
•CL_INVALID_DEVICE if OpenCL devices listed in
device_list are not in the list of devices associated with
program.
•CL_INVALID_BINARY if program is created
with clCreateProgramWithBinary(3clc) and devices listed in
device_list do not have a valid program binary loaded.
•CL_INVALID_BUILD_OPTIONS if the build options
specified by options are invalid.
•CL_INVALID_OPERATION if the build of a program
executable for any of the devices listed in device_list by a previous
call to clBuildProgram for program has not completed.
•CL_COMPILER_NOT_AVAILABLE if program is
created with clCreateProgramWithSource(3clc) and a compiler is not
available i.e. CL_DEVICE_COMPILER_AVAILABLE specified in the table of OpenCL
Device Queries for clGetDeviceInfo(3clc) is set to CL_FALSE.
•CL_BUILD_PROGRAM_FAILURE if there is a failure to
build the program executable. This error will be returned if
clBuildProgram does not return until the build has completed.
•CL_INVALID_OPERATION if there are kernel objects
attached to program.
•CL_INVALID_OPERATION if program was not created
with clCreateProgramWithSource(3clc) or
clCreateProgramWithBinary(3clc).
•CL_OUT_OF_RESOURCES if there is a failure to
allocate resources required by the OpenCL implementation on the device.
•CL_OUT_OF_HOST_MEMORY if there is a failure to
allocate resources required by the OpenCL implementation on the host.
SPECIFICATION¶
OpenCL Specification[1]SEE ALSO¶
clGetDeviceInfo(3clc)AUTHORS¶
The Khronos GroupCOPYRIGHT¶
Copyright © 2007-2011 The Khronos Group Inc.NOTES¶
- 1.
- OpenCL Specification
page 137, section 5.6.2 - Building Program
Executables
06/18/2014 | The Khronos Group |