PM0014 datasheet(13/46 Pages) STMICROELECTRONICS

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PM0014

Arithmetic library functions

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Arithmetic library functions

5.1

Overview

In this part, principal arithmetic functions for C programmers on ST10 are presented. For

each operation, four function types have been created according to parameters:

●

Real parameters in single precision,

●

Real parameters in double precision,

●

Complex parameters in single precision,

●

Complex parameters in double precision.

Code size results will be given in bytes and performance ones in instruction cycles (1

instruction cycle is equal to two ST10 CPU clock cycles).

5.2

Addition

5.2.1

add_16

add_16 (short Op1, short Op2, short *Output)

Description:

Addition of two real 16-bit inputs.

Argument:

Op1

Op2

Output

Left operand

Right operand

Output pointer

Algorithm:

Op1 + Op2 = Output

Assembly source code: add_16.asm

Code size and cycles:

Size: 6 bytes

Instruction cycles: 10

Test:

Two files are provided to test the function: an input vector file

(Add_16.in) and an output vector file (Add_16.res):

Add_16.in is made as follows:

Left operand1, Right operand1,

Left operand2, Right operand2,

...

Add_16.res is made as follows:

Output operand1,

Output operand2,

...

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