PM0014 datasheet(19/46 Pages) STMICROELECTRONICS

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PM0014

Arithmetic library functions

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5.3.3

cSub_16

cSub_16 (short LeftOp_I, short LeftOp_R, short RightOp_I, short RightOp_R, long

*Output)

Description:

Subtraction of two complex 16-bit operands.

Argument:

LeftOp_I

Left operand imaginary part.

LeftOp_R

Left operand real part.

RightOp_I

Right operand imaginary part.

RightOp_R

Right operand real part.

Output

Output pointer.

Algorithm:

LeftOp_R - RightOp_R = Output_R

LeftOp_I - RightOp_I = Output_I

Note:

Output imaginary part is contained in the highest address (pointed

by Output + 2). Output real part is contained in the lowest address

(pointed by Output).

Assembly source

code:

cSub_16.asm

Code size and cycles: Size: 14 bytes

Instruction cycles: 18

Test:

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

(cSub_16.in) and an output vector file (cSub_16.res):

cSub_16.in is made as follows:

LeftOp_I1, LeftOp_R1, RightOp_I1, RightOp_R1

LeftOp_I2, LeftOp_R2, RightOp_I2, RightOp_R2

...

cSub_16.res is made as follows:

Output_R1,Output_I1

...

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