fopenmp-target-buffers, Qopenmp-target-buffers
Enables a way to overcome the problem
where some OpenMP* offload SPIR-V* devices produce incorrect code when a target
object is larger than 4GB.
Syntax
Linux:
-fopenmp-target-buffers
=
keyword
Windows:
/Qopenmp-target-buffers
:
keyword
Arguments
- keyword
- Possible values are:
- default
- Tells the compiler to use default heuristics. This may produce incorrect code on some OpenMP* offload SPIR-V* devices when a target object is larger than 4GB.
- 4GB
- Tells the compiler to generate code to prevent the issue described bydefault. OpenMP* offload programs that access target objects of size larger than 4GB in target code require this option.This setting applies to the following:
- Target objects declared in OpenMP* target regions or inside OpenMP* declare target functions
- Target objects that exist in the OpenMP* device data environment
- Objects that are mapped and/or allocated by means of OpenMP* APIs (such as omp_target_alloc)
Default
- default
- If you do not specify this option, the compiler may produce incorrect code on some OpenMP* offload SPIR-V* devices when a target object is larger than 4GB.
Description
This option enables a way to overcome the problem where some OpenMP* offload
SPIR-V* devices produce incorrect code when a target object is larger than 4GB
(4294959104 bytes).
However, note that when
-fopenmp-target-buffers=4GB
(or
/Qopenmp-target-buffers:4GB
) is specified on Intel® GPUs,
there may be a decrease in performance.
To use this option, you must also specify option
-fopenmp-targets
(Linux*) or
/Qopenmp-targets
(Windows*).
This option may have no effect for some OpenMP* offload
SPIR-V* devices, and for OpenMP* offload targets different from SPIR*.
When OpenMP* offloading is enabled, this option only
applies to device-specific compilation.
IDE Equivalent
Visual Studio:
DPC++ > Language >
Specify buffer size for OpenMP offload kernel access limitations
(DPC++)
Visual Studio:
C/C++ > Language [Intel
C++] > Specify buffer size for OpenMP offload kernel access limitations
(C++)
Eclipse:
Intel(R) oneAPI DPC++ Compiler > Language >
Specify buffer size for OpenMP offload kernel access limitations
(DPC++)
Eclipse:
Intel C++ Compiler > Language > Specify buffer
size for OpenMP offload kernel access limitations
(C++)
Alternate Options
None