[llvm-dev] Correct Usage of Different Inlining Modes

[via llvm-dev]

Hi,

I am trying to see the difference between different inlining options that
llvm supports (https://clang.llvm.org/docs/analyzer/developer-docs/IPA.html).
The way I invoked them was -

clang++ -Xclang -analyzer-config -Xclang -ipa=dynamic -std=c++11 -Wall
something.cc -o something (for dynamic mode)
clang++ -Xclang -analyzer-config -Xclang -ipa=basic -std=c++11 -Wall
something.cc -o something (for basic mode)

and so on.

However, I did't observe much difference in execution times for the runs
with different inlining modes, which is making me wonder if I did this
correctly? Is this the right way to use the different inlining modes? Can
anyone tell me if I am missing something?

Thanks,
Bodhi

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[Min-Yih Hsu via llvm-dev]

I think you’re invoking clang static analyzer (https://clang-analyzer.llvm.org ) — a tool that is used to find bugs and I don’t think it will affect the generated IR / machine code.

I think a better way to test different inline configurations will be generating IR files using clang and play around with different `opt` (inlining) options.

-Min

[via llvm-dev]

On 2021-10-20 16:47, Min-Yih Hsu wrote:
> I think you’re invoking clang static analyzer
> (https://clang-analyzer.llvm.org

> <https://clang-analyzer.llvm.org/> ) — a tool that is used to find bugs and

Let me re-iterate my question. Is there any way we can test out the inlining
modes mentioned in clang documentation
(https://clang.llvm.org/docs/analyzer/developer-docs/IPA.htm) -
basic-inlining, dynamic, dynamic-bifurcate, etc? The instructions in the docs
seem to be talking about clang in general, not the static analyzer.

Also, I'd appreciate if you point to an example usage of different inlining
options with opt? I am only aware of the -always-inline flag that can be
loaded with opt.

[David Blaikie via llvm-dev]

Correcting the URL (adding a trailing 'l'): https://clang.llvm.org/docs/analyzer/developer-docs/IPA.html

This documentation is specifically for Clang's static analyzer (note the "analyzer" in the URL, the root page for this section is here: https://clang.llvm.org/docs/ClangStaticAnalyzer.html )

This has no impact on the code Clang generates, only the static analysis warnings it produces.