oneapi-src / oneapi-src/level-zero
zeModuleGetGlobalPointer can not get correct size of global variable
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- Dominant language
- C++
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Description
When we invoked zeModuleGetGlobalPointer to retrieve the size of global variable specified by the 2nd argument (which is a string for global variable's name) , zeModuleGetGlobalPointer just returned 0 in the 3rd argument, but gave correct device visible pointer in the 4th argument.
We referred to the description at: https://spec.oneapi.com/level-zero/latest/core/api.html?highlight=globalpointer#zemodulegetglobalpointer . The L0 module was create by adding the compilation flag '-cl-std=CL2.0 -cl-take-global-address'
We tried the definition of global variable as scalar type or array type, neither of their size can be retrieved via zeModuleGetGlobalPointer correctly.
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Research direction
Start with the linked zeModuleGetGlobalPointer specification and reproduce the reported scalar and array cases using the stated compilation flags. Trace the zeModuleGetGlobalPointer entry point in the Level Zero loader and compare the returned size with the expected global-variable size. Done means both cases return the correct size while preserving the valid device-visible pointer.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- api
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100