Replacing OpenMP runtime call <call> with <value>.

This optimization remark indicates that analysis determined an OpenMP runtime calls can be replaced with a constant value. This can occur when an OpenMP runtime call that queried some internal state was found to always return a single value after analysis.

Example

This optimization will trigger for most target regions to simplify the runtime once certain constants are known. This will trigger for internal runtime functions so it requires enabling verbose remarks with -openmp-opt-verbose-remarks (prefixed with -mllvm for use with clang).

void foo() {
#pragma omp target parallel
  { }
}

$ clang test.c -fopenmp -fopenmp-targets=nvptx64 -O1 -Rpass=openmp-opt \
  -mllvm -openmp-opt-verbose-remarks
remark: Replacing runtime call __kmpc_is_spmd_exec_mode with 1. [OMP180] [-Rpass=openmp-opt]
remark: Replacing runtime call __kmpc_is_spmd_exec_mode with 1. [OMP180] [-Rpass=openmp-opt]
remark: Replacing runtime call __kmpc_parallel_level with 1. [OMP180] [-Rpass=openmp-opt]
remark: Replacing runtime call __kmpc_parallel_level with 1. [OMP180] [-Rpass=openmp-opt]

Diagnostic Scope

OpenMP optimization remark.