I am using GCC's -finline-limit=N compiler option. I am compiling my code and profiling it to check for reduction of CPU cycles. When I increase N, ideally, I should see a decrease in the number of cycles as larger functions get inlined. But I am seeing increase in the CPU cycles. Why is this happening?
Exact behavior of the -finline-limit GCC compiler option
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There are multiple parameters (--param) for inlining in gcc. finline-limit uses some of them.
You can find the parameters here:
gcc optimize-options (search for max-inline-insns-single)
You can get some information on GCCs inline-heuristik from the sourcecode: ipa-inline-analysis.c (the comment at the top)
Note: Reducing function calls, branching etc. via inlining does not always reduce CPU cycles. Setting finline-limit to a large number can make things worse. Using
__attribute__ ((flatten))on functions can produce better results. All optimizing parameters can produce different results depending on your instruction sets and compiler version.