Benchmarking the SGI: Floating point faster than integer?

news news at helens.Stanford.EDU
Wed Sep 12 06:33:55 AEST 1990


The program is a rather extreme benchmark.  A more balanced program
representative of your application would make more sense as a
purchasing criterion.

But if you want raw multiplication speeds, each of the FORTRAN
multiplies is actually four machine instructions: two loads, a
multiply and a store.  If you edit the assembly code to discount the
loads and stores by repeating the mul instruction N times, the FP
multiply is actually 3X faster than the integer!!!

Jim Helman
Department of Applied Physics			Durand 012
Stanford University				FAX: (415) 725-3377
(jim at KAOS.stanford.edu) 			Work: (415) 723-9127



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