forked from OSchip/llvm-project
50 lines
1.6 KiB
ReStructuredText
50 lines
1.6 KiB
ReStructuredText
.. _omp140:
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Could not internalize function. Some optimizations may not be possible. [OMP140]
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====================================================================================================================
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This analysis remark indicates that function internalization failed for the
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given function. Internalization occurs when a call to a function that ordinarily
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has external visibility is replaced with a call to a copy of that function with
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only internal visibility. This allows the compiler to make strong static
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assertions about the context a function is called in. Without internalization
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this analysis would always be invalidated by the possibility of someone calling
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the function in a different context outside of the current translation unit.
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This is necessary for optimizations like :ref:`OMP111 <omp111>` and :ref:`OMP120
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<omp120>`. If a function failed to be internalized it most likely has linkage
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that cannot be copied. Internalization is currently only enabled by default for
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OpenMP target offloading.
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Examples
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--------
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This will occur for any function declaration that has incompatible linkage.
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.. code-block:: c++
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__attribute__((weak)) void setup();
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void foo() {
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#pragma omp target
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{
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setup();
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#pragma omp parallel
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{
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work();
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}
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}
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}
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.. code-block:: console
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$ clang++ -fopenmp -fopenmp-targets=nvptx64 -O1 -Rpass-analysis=openmp-opt omp140.cpp
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omp140.cpp:1:1: remark: Could not internalize function. Some optimizations may not
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be possible. [OMP140]
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__attribute__((weak)) void setup() {
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^
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Diagnostic Scope
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----------------
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OpenMP analysis remark.
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