Basic HTML version of Foils prepared November 5 98

Foil 45 JGF Proposed FP Execution Modes

From Integration of Scientific and Technical Computing with Enterprise Information Systems: Gateway and IPSE ASC Dayton Ohio Invited Presentation -- October 29 98. by Geoffrey C. Fox
Language Chip Architecture
Modifier x86 PowerPC SPARC
strictfp Java 1.0 (no double Java 1.0 Java 1.0
rounding on underflow) (no fused mac)
default i.e. larger exponent range fused mac can Java 1.0
no modifier allowed be used
associativefp many optimizations allowed on all platforms
Current default is essentially strictfp although not always implemented precisely
mac is fused hardware multiply-add (a*b+c)
strictfp is a little more than 2 times slower than default on INTEL x86 for a vector dot product

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