lazyweb, let's say I have `uintmax_t a, b;`. I need to figure out if `a + b` has carry-out. by definition I can't put the result in a wider integer type; what's a good portable way to do this anyway?
I know I'm late to the party but since I looked into those patterns for RISC-V BitManip Carry / Unsigned Overflow: a+b < a Signed Overflow: (a+b < a) != (b < 0) (modulo bugs. I am afk so this is off the top of my head. :)
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Signed version isn't valid C. Unsigned one is okay though.
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Oh, yeah, good catch. Didn't care about that in the BitManip work because there it's written in RISC-V asm. :)pic.twitter.com/2dQT78AYCP
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