33FJ128GP708 datasheet(49/90 Pages) MICROCHIP

49 / 90 page

Preliminary

DS70155C-page 47

dsPIC33F

11.1

Math Library

The dsPIC33F Math Library is the compiled version of

the math library that is distributed with the highly

optimized, ANSI-compliant dsPIC33F MPLAB C30 C

Compiler (SW006012). It contains advanced single and

double-precision

floating-point

arithmetic

and

trigonometric functions from the standard ‘C’ header

file (math.h). The library delivers small program code

size and data size, reduced cycles and high accuracy.

Features

• The math library is callable from either MPLAB

C30 or dsPIC33F assembly language.

• The functions are IEEE-754 compliant, with

signed zero, signed infinity, NaN (Not a Number)

and denormal support and operated in the “Round

to Nearest” mode.

• Compatible with MPLAB ASM30 and MPLAB

LINK30, which are available at no charge from

Microchip’s web site.

Table 11-2 shows the memory usage and performance

of the Math Library. Table 11-3 lists the math functions

that are included.

TABLE 11-2:

MEMORY USAGE AND

PERFORMANCE

TABLE 11-3:

MATH FUNCTIONS

Memory Usage (bytes)(1,2)

Code size

5250

Data size

Performance (cycles)(1,3)

add

122

sub

124

mul

109

div

361

Rem

385

Sqrt

492

Note 1:

Results are based on using dsPIC33F

MPLAB C30 C Compiler (SW006012),

version 1.20.

Maximum “Memory Usage” when all

functions in the library are loaded. Most

applications will use less.

Average 32-bit floating-point performance

results.

Single and Double-Precision Floating-Point Functions

Arithmetic Functions

add, subtract, multiply, divide, remainder

Root and Power Functions

pow, sqrt

Trigonometric and Hyperbolic Functions

acos, asin, atan, atan2, cos, cosh, sin, sinh, tan, tanh

Logarithmic and Exponential Functions

exp, log, log10, frexp, ldexp

Rounding Functions

ceil, floor

Absolute Value Functions

fabs

Modular Arithmetic Functions

fmod, modf

Comparison and Conversions

comparison, integer and floating-point conversions

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