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The effects of using flush-to-zero mode

With certain exceptions, flush-to-zero mode has the following effects on floating-point operations:

  • A denormalized number is treated as 0 when used as an input to a floating-point operation. The source register is not altered.

  • If the result of a single-precision floating-point operation, before rounding, is in the range -2-126 to +2-126, it is replaced by 0.

  • If the result of a double-precision floating-point operation, before rounding, is in the range -2-1022 to +2-1022, it is replaced by 0.

An inexact exception occurs whenever a denormalized number is used as an operand, or a result is flushed to zero. Underflow exceptions do not occur in flush-to-zero mode.

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