autoconf: Integer Overflow

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1 13.2 Integer Overflow
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1 In practice many portable C programs assume that signed integer
1 overflow wraps around reliably using two's complement arithmetic.  Yet
1 the C standard says that program behavior is undefined on overflow, and
1 in a few cases C programs do not work on some modern implementations
1 because their overflows do not wrap around as their authors expected.
1 Conversely, in signed integer remainder, the C standard requires
1 overflow behavior that is commonly not implemented.
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Menu

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· Integer Overflow Basics     Why integer overflow is a problem
· Signed Overflow Examples    Examples of code assuming wraparound
· Optimization and Wraparound  Optimizations that break uses of wraparound
· Signed Overflow Advice      Practical advice for signed overflow issues
· Signed Integer Division     `INT_MIN / -1' and `INT_MIN % -1'
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