Comment by fpoling
7 hours ago
I wonder are there any compilers that recognizes switch-in-loop pattern of interprets and optimizes it to be branch-predictor friendly using multiple indirect jumps?
7 hours ago
I wonder are there any compilers that recognizes switch-in-loop pattern of interprets and optimizes it to be branch-predictor friendly using multiple indirect jumps?
MSVC can do this for x86 if the cases are densely packed and the default is blocked: https://gcc.godbolt.org/z/GPo9fMx8G
However, this optimization is less effective on modern CPUs with more powerful indirect predictors using global history.
I believe that Rust does this which implies that it might be common to the clang back end.
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