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Math Products


GoFast® for Microsoft C

• Fast
• ROMable
  
• IEEE 754 Format
• "Link and Go" compiler support
• Includes C startup code
  
• Includes sscanf and sprintf
  
• Includes test programs and make file
  

GoFast® for Microsoft C was carefully designed for high performance operation and ease of use including "link and go" compatibility with Microsoft C compilers -- versions 5.1, 6, 7, and 8. GoFast provides ROMable, reentrant IEEE and ANSI compatible 80x86 floating point support.


 Functionality

GoFast supports reentrant floating point calculations for the Microsoft compiler. GoFast includes the following routines in library format:

• complete floating point emulator
  
• _status87, _clear87, _control87
  
• conversion operations
  
• sqrt
  
• sin, cos, tan
  
• asin, acos, atan, atan2
  
• sinh, cosh, atanh
  
• log, log10
  
• exp, pow
  
• initialization (DOS version)

GoFast includes the following routines in source form to support linking without the
Microsoft library:

• sscanf, sprintf
  
• floor, ceil, fabs
• modf, fmod, frexp, ldexp
  
• hypot, cabs
  
• internal long integer math
  
• skeleton startup routine
  
• initialization (embedded versions)

Enviornment

GoFast for Microsoft C will operate in either a DOS environment or an embedded environment.

In a DOS environment, the GoFast library USEMU.LIB is used. This library includes an automatic initialization routine.

In an embedded environment, the GoFast library USEMUND.LIB is used. This library does not include an initialization routine. GoFast provides two embedded initialization routines -- one that uses software interrupts (EMUINIT.ASM) and one that uses the "coprocessor not present" interrupt (EMUIR7.ASM). The choice is yours. These initialization routines are ROMable, and provide maximum flexibility for embedded operation.

Considerations

GoFast is primarily designed to facilitate embedded operation. However, it is also tuned for performance. The following table gives the timing of some floating point operations, both with and without GoFast. The times, given in microseconds, were measured using a 16 MHz 386SX.

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.