Use jtckdint.h for checked integer operations #217
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This is a single header implementation of C11's `stdckdint.h` (using the GCC/Clang builtins where possible) which looks like it does a better job than our fallback functions.
* All functions are constexpr * #include <stdbool.h> to define the `_Bool` type to avoid an error with GCC in C++ mode * Use GNU builtins (__builtin_add_overflow etc) even when __STRICT_ANSI__ is defined (if upstream GCC and Clang are happy to do use the builtins in strict ANSI mode then so am I)
The jtckdint.h library uses * C11 `ckd_add()` etc when available * Otherwise, GNU compiler builtins (`__builtin_add_overflow()` etc) when available * Otherwise, a high-quality fallback implementation The fallback implementation looks to be rather better than our own fallback impls, and will hopefully lead to better codegen on MSVC where the builtins are not available.
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #217 +/- ##
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- Coverage 98.62% 98.60% -0.02%
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Files 69 69
Lines 2614 2578 -36
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- Hits 2578 2542 -36
Misses 36 36 ☔ View full report in Codecov by Sentry. |
This is "unreferenced formal parameter", which as of MSVC 19.40 is getting triggered even when the parameter *is* referenced by a different `if constexpr` path. https://developercommunity.visualstudio.com/t/Bogus-C4100-unreferenced-formal-paramet/10720820
C4146 unary minus applied to unsigned type
After some experimentation on Compiler Explorer, it seems like we can use FLUX_ALWAYS_INLINE on the one hand and manually "flattening" calls on the other to (hopefully) improve the unoptimised codegen and the debugger experience
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The jtckdint.h library uses
ckd_add()etc when available__builtin_add_overflow()etc) when availableIn particular, the fallback implementations look to be rather better than our own fallback impls, and will hopefully lead to better codegen on MSVC where the builtins are not available.