PM0014 datasheet(23/46 Pages) STMICROELECTRONICS

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PM0014

Arithmetic library functions

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5.4.3

cMul_q15_q15_q15

cMul_q15_q15_q15 (short LeftOp_I, short LeftOp_R, short RightOp_I, short

RightOp_R, short *Output).

Description:

Multiplication of two complex 32-bit (16 bits for each part) inputs.

Output is on 32 bits (16 bits for each part).

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 - LeftOp_I * RightOp_I = Output_R

LeftOp_R * RightOp_I + LeftOp_R * RightOp_I = Output_I

Note:

Output imaginary part is contained in the highest address (pointed

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

Output).

Assembly source

code:

cMul_q15_q15_q15.asm

Code size and cycles: Size: 36 bytes

Instruction cycles: 14

Test:

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

(cMul_q15_q15_q15.in) and an output vector file

(cMul_q15_q15_q15.res):

cMul_q15_q15_q15.in is made as follows:

LeftOp_I1, LeftOp_R1, RightOp_I1, RightOp_R1,

...

cMul_q15_q15_q15.res is made as follows:

Output_I1,

Output_R1,

...

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