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Inspired by python/cpython#96678 (comment)
At the moment we compile releases with -fwrapv
which makes the code a bit safer, but disables certain optimizations. From the GCC docs:
This option instructs the compiler to assume that signed arithmetic overflow of addition, subtraction and multiplication wraps around using twos-complement representation. This flag enables some optimizations and disables others.
My experiments with running sanitisers seem to suggest that we are nearly already ready for -fno-wrapv
(or -fstrict-overflow
in general). Doing so could lead to quite a few speedups, but we would need to be more careful with the code we write.
It might be worthwhile to get a few benchmarks.
mdboom, davfsa and leo-smi
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