This had me scratching my head for a while. Shouldn't -1 / INT_MIN just be 0? In... | Hacker News

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im3w1l on Nov 26, 2022 | parent | context | favorite | on: Figuring out round, floor and ceil with integer di...

This had me scratching my head for a while. Shouldn't -1 / INT_MIN just be 0? Indeed it should. INT_MIN / -1 is what causes the issue. I also tested doing that the latter just to be sure, and on my system, performing that division led to a result of INT_MIN rather than an exception.

Edit: Actually further tests with INT_MIN / - 1 did lead to a crash. Maybe the first result was due to constant folding or something.

Sharlin on Nov 26, 2022 [–]

Like all signed overflow, it's undefined behavior in C and C++, so what exactly happens is up to the gods of optimizing compilers.

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