[Openmcl-devel] single float support in OpenMCL
gb at clozure.com
Mon Aug 23 21:15:51 EDT 2004
On Mon, 23 Aug 2004, Gary King wrote:
> It's my understanding that unlike MCL, OpenMCL supports both IEEE
> single and double floats.
Both implementations support both IEEE single and double floats.
In MCL, a lisp SHORT-FLOAT denotes an IEEE single float, and the
other CL float types all denote an IEEE double.
In OpenMCL, lisp SHORT-FLOATs and SINGLE-FLOATs are IEEE singles,
while DOUBLE-FLOAT and LONG-FLOAT are IEEE doubles.
> If this is correct, is there some fast
> mechanism to test a number for single-float-hood (similar to
(CCL::DOUBLE-FLOAT-P x) is exactly the same as
(TYPEP x 'DOUBLE-FLOAT).
This doesn't tell you anything about whether a number is an IEEE single,
an IEEE double, or something else.
In MCL, the CL types SINGLE-FLOAT and DOUBLE-FLOAT are synonymous; in
most other implementations, they're disjoint.
> Gary Warren King, Lab Manager
> EKSL East, University of Massachusetts * 413 577 0176
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