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doh: fix undefined behaviour in swap #4350
The undefined behaviour is annoying when running fuzzing with
By incrementing the pointer first, both gcc and clang recognize this
The undefined behaviour is annoying when running fuzzing with sanitizers. The codegen is the same, but the meaning is now not up for dispute. See https://cppinsights.io/s/516a2ff4 By incrementing the pointer first, both gcc and clang recognize this as a bswap and optimizes it to a single instruction. See https://godbolt.org/z/994Zpx