PM0014 datasheet(24/46 Pages) STMICROELECTRONICS

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Arithmetic library functions

PM0014

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5.4.4

cMul_q31_q31_q31

cMul_q31_q31_q31 (short Op1_I_Msb, short Op1_I_Lsb, short Op1_R_Msb,

short Op1_R_Lsb, short Op2_I_Msb, short Op2_I_Lsb, short Op2_R_Msb,

short Op2_R_Lsb, long *Output).

Description:

Multiplication of two complex 64-bit (32 bits for each part) inputs.

Output is on 64 bits (32 bits for each part).

Argument:

Op1_I_Msb

Left operand imaginary part most significant bits.

Op1_I_Lsb

Left operand real part least significant bits.

Op1_R_Msb

Right operand imaginary part most significant bits.

Op1_R_Lsb

Right operand real part least significant bits.

Op2_I_Msb

Left operand imaginary part most significant bits.

Op2_I_Lsb

Left operand real part least significant bits.

Op2_R_Msb

Right operand imaginary part most significant bits.

Op2_R_Lsb

Right operand real part least significant bits.

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 + 4). Output real part is in the lowest address (pointed by

Output).

Assembly source

code:

cMul_q31_q31_q31.asm

Code size and cycles: Size: 214 bytes

Instruction cycles: 75

Test:

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

(cMul_q31_q31_q31.in) and an output vector file

(cMul_q31_q31_q31.res):

cMul_q31_q31_q31.in is made as follows:

LeftOpMsb_I1, LeftOpLsb_I1, LeftOpMsb_R1, LeftOpLsb_R1,

RightOpMsb_I1, RightOpLsb_I1, RightOpMsb_R1, RightOpLsb_R1,

...

cMul_q31_q31_q31.res is made as follows:

OutputMsb_I1, OutputLsb_I1,

...

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