Solved! I tried this before BUT DIDN'T ENABLE OPTIMIZATION. 
With optimization it just works.pic.twitter.com/fycZuJcxpj
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Asm template question: Is there a way to replace these two functions with one function that automatically uses rori when the 2nd argument is a constant known at compile-time? #FollowerPowerpic.twitter.com/TBcW8YEUc7
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Context for the curious: https://github.com/riscv/riscv-bitmanip/blob/master/cproofs/rvintrin.h …
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if this is C++17, you can maybe replace it with a template argument and use `if constexpr`
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Thanks! Solved it.https://twitter.com/oe1cxw/status/1135104744593272833 …
Solved! I tried this before BUT DIDN'T ENABLE OPTIMIZATION. With optimization it just works. pic.twitter.com/fycZuJcxpjShow this thread
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__builtin_constant_p might work for this
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Thanks! Yes, it does.https://twitter.com/oe1cxw/status/1135104744593272833 …
Solved! I tried this before BUT DIDN'T ENABLE OPTIMIZATION. With optimization it just works. pic.twitter.com/fycZuJcxpjShow this thread
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In GNU C, `__builtin_constant_p` generally works with inlining too. In pure C >=11, you can detect integer constant expressions with `_Generic((1? (void *) ((!!(X))*0ll) : (int *) 0), int*: 1, void*: 0)`, but you'd have to replace the inlines with macros.
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What humans let this atrocity exist
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