the code is full of C standard violations, its not big surprise the
compiler optimizes it to brokenness.
one can work around it by setting -fno-strict-overflow
but there are also aliasing issues so one should probably also set
fno-strict-aliasing, thought it is not required right now.
it also uses undefined arithmetic operations on global memory which
tends to brake very often too, the other arches like arm are very
susceptible to that.



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