How do I force loop unrolling factor using clang/clang++?
I know it is possible via metadata nodes but do we have some command line option to override compiler’s decision?
There are pragmas within clang to do this as well #pragma clang loop unroll_count(x). The command line option to control loop unrolling would be -mllvm -unroll-count, which maps to the option within the LoopUnrollPass. llvm-project/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp at 8ff0ab0a2ae28c4f4d4b299683a2cc69860295a2 · llvm/llvm-project · GitHub