Ignoring exceptions from IEEE 754 floating-point arithmetic operations

The system invents a plausible result for the operation and returns that result. For example, the square root of a negative number can produce a NaN, and trying to compute a value too big to fit in the format can produce infinity. If an exception occurs and is ignored, a flag is set in the floating-point status word to tell you that something went wrong at some time in the past.

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