On Tue, May 2, 2023 at 8:03 AM <jmsa...@gmail.com> wrote: > > I think this example shows that you don't need any special infrastructure > > from numpy. I don't think there is going to be much appetite to expand > our > > API in this direction. > > But I do! I'm looking for something that implements the > multiply_check_ov(X,Y) and similar functionality for addition and > subtraction, for large arrays; I don't know how to do that efficiently. (Or > even correctly for 64-bit operands --- for 8/16/32 I suppose as a baseline > I could do the math in 64-bit arithmetic and if the answer doesn't match, > then use the sign bit of the 64-bit result for determining overflow.) >
Some C compilers provide some builtin functions that do this for you, and some cross-platform headers around that show how to do this. https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html https://github.com/pytorch/pytorch/blob/main/c10/util/safe_numerics.h https://github.com/dcleblanc/SafeInt -- Robert Kern
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