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 Math Products
GoFast® for Z80/Z180/64180
Fast Floating Point Library
Features
- Fast
- ROMable
- Conforms to IEEE 754 Format
- Includes single and double precision
- Includes test programs
Description
GoFast for Z80 was carefully designed for high performance operation on Z80
and Z180 architectures. The product optimizes for a balance of space and speed.
Speed
Timings for some functions follow. These sample microsecond timings are based
on a 6 MHz Z80.
Approximate Timings in Microseconds
(Typical - Maximum)
Function |
Single |
Double |
| add |
163-227 |
550-950 |
| multiply |
693-817 |
3350-3567 |
| divide |
905-1267 |
5583-8000 |
| SIN/COS |
6667 |
42667 |
| LN |
7167 |
37000 |
| SQRT |
2500 |
20333 |
Floating Point Technology
GoFast for Z80 is based on U S Software's proven floating point algorithms the
company has been developing for over a decade. The algorithms have been thoroughly
tested using automated methods. GoFast was specifically optimized and integrated for
high performance on Z80 processors.
Functionality
GoFast for Z80 implements a floating point accumulator (FAC) in read-write
memory. Operations and functions are performed using the value in FAC.
GoFast for Z80 is not naturally reentrant. However, reentrancy can be achieved
by saving/restoring the FAC and other GoFast temporaries during a context switch. An
application note included with the product describes the procedure.
- + - * /
- conversion operations
- sqrt
- sin, cos, tan
- atan
- ln, log
- exp, xtoi
- Integer to/from Float conversions
- ASCII to/from Float conversions
GoFast Support
U S Software maintains a test lab where comprehensive confidence tests are
performed on GoFast in each target environment. A demonstration test program is
included with your product delivery, and you are encouraged to run it on your own target
hardware to verify system operation. Phone and fax support are provided with the
product. Extended support is also available.
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