[OpenMP][SystemZ] Compile __kmpc_omp_task_begin_if0() with backchain #71834
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OpenMP runtime fails to build on SystemZ with clang with the following
error message:
LLVM ERROR: Unsupported stack frame traversal count
__kmpc_omp_task_begin_if0() uses OMPT_GET_FRAME_ADDRESS(1), which
delegates to __builtin_frame_address(), which in turn works with
nonzero values on SystemZ only if backchain is in use. If backchain
is not in use, the above error is emitted.
Compile __kmpc_omp_task_begin_if0() with backchain. Note that this
only resolves the build error. If at runtime its caller is compiled
without backchain, __builtin_frame_address() will produce an incorrect
value, but will not cause a crash. Since the value is relevant only
for OMPT, this is acceptable.
uweigand
approved these changes
Nov 9, 2023
zahiraam
pushed a commit
to zahiraam/llvm-project
that referenced
this pull request
Nov 20, 2023
…lvm#71834) OpenMP runtime fails to build on SystemZ with clang with the following error message: LLVM ERROR: Unsupported stack frame traversal count __kmpc_omp_task_begin_if0() uses OMPT_GET_FRAME_ADDRESS(1), which delegates to __builtin_frame_address(), which in turn works with nonzero values on SystemZ only if backchain is in use. If backchain is not in use, the above error is emitted. Compile __kmpc_omp_task_begin_if0() with backchain. Note that this only resolves the build error. If at runtime its caller is compiled without backchain, __builtin_frame_address() will produce an incorrect value, but will not cause a crash. Since the value is relevant only for OMPT, this is acceptable.
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OpenMP runtime fails to build on SystemZ with clang with the following error message:
__kmpc_omp_task_begin_if0() uses OMPT_GET_FRAME_ADDRESS(1), which delegates to __builtin_frame_address(), which in turn works with nonzero values on SystemZ only if backchain is in use. If backchain is not in use, the above error is emitted.
Compile __kmpc_omp_task_begin_if0() with backchain. Note that this only resolves the build error. If at runtime its caller is compiled without backchain, __builtin_frame_address() will produce an incorrect value, but will not cause a crash. Since the value is relevant only for OMPT, this is acceptable.