Some Functions Computable with a Fused-Mac

The fused multiply accumulate instruction (fused-mac) that is available on some current processors such as the Power PC or the Itanium eases some calculations. We give examples of some floating-point functions (such as ulp(x) or Nextafter(x, y)), or some useful tests, that are easily computable using a fused-mac. Then, we show that, with rounding to the nearest, the error of a fused-mac instruction is exactly representable as the sum of two floating-point numbers. We give an algorithm that computes that error.

• Type: Conference
• Year: 2005
• Where: ARITH
• Authors: Sylvie Boldo, Jean-Michel Muller
• Keywords: Applied Computing, ARITH 2005, Current Processors, Fused Multiply Accumulate, Power PC