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Math Products


GoFast® for NEC V85x


Fast Floating Point Library


Features

  • Fast
  • Reentrant
  • ROMable
  • Conforms to IEEE 754 Format
  • "Link and Go" compiler support for Diab Data C/C++
  • Includes startup code
  • Includes test programs and make file


Compiler Support

GoFast® libraries are designed for “link and go” operation with each compiler. These libraries provide the user with a significant speed advantage when no floating point coprocessor hardware is available. This is of particular significance in real-time embedded systems.

GoFast for NEC V85x includes drop-in libraries for “link and go” seamless operation with Green Hills C compiler. The GoFast routines directly replace the compiler’s floating point runtime library routines.

Capabilities and Accuracy

GoFast is reentrant. There is no need to perform any special state save/restore. GoFast is ROMable. GoFast is IEEE 754 and ANSI C compatible.

The basic functions + - * / and the conversions perform the IEEE 754 "nearest or even" rounding exactly. The other functions are accurate within one mantissa unit.

GoFast routines make no distinction between quiet and signaling Not-a-Numbers (NaNs). In the case of an invalid operation, the answer is always a standard quiet NaN.

GoFast routines support IEEE 754 masked exception handling for overflows invalid operations. No unmasked exceptions are supported. Underflow and precision are not reported. Division by zero is treated as an invalid operation.

GoFast Support

US Software maintains a test lab where comprehensive confidence tests are performed on GoFast in each target environment. A demonstration test program 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 can be provided with the product. Extended support is also available.

Functionality

GoFast contains the following floating point routines in both single and double
precision:

add, subtract, multiply, divide
compare operations
conversion operations
sin, cos, tan
asin, acos, atan, atan2
sinh, cosh, tanh
exp, pow
log, log10
fabs, ceil, floor
modf, fmod, frexp, ldexp

Performance

GoFast delivers the optimized performance you can expect with the NEC V85x processor. The following timings were measured using GoFast library calls with an NEC V851 processor (at 6.6 MHz external xtal with 33 MHz PLL) on an RTE-V851-PC board. The test used the Green Hills v1.8.8 compiler.

Microsecond Timings

GHS
GoFast
GHS
GoFast
add
58
24
99
36
subtract
82
28
137
45
multiply
692
126
632
104
divide
564
157
2076
322
sqrt
1432
344
8255
683
exp
1121
210
8260
923
log
2145
285
10392
1015
log10
2324
306
11075
1081
sin
942
169
7409
669
cos
1015
151
7489
669
tan
2385
317
10850
1312
asin
4993
762
24382
1846
acos
4912
911
18789
2179
atan
1984
283
13130
847
atan2
2680
424
15428
1196
pow
3732
542
19839
2003




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