PM0014 datasheet(16/46 Pages) STMICROELECTRONICS

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Arithmetic library functions

PM0014

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5.2.4

cAdd_32

cAdd_32 (short LeftOpMsb_I, short LeftOpLsb_I, short LeftOpMsb_R,

short LeftOpLsb_R, short RightOpMsb_I, short RightOpLsb_I,

short RightOpMsb_R, short RightOpMsb_I, long *Output)

Description:

Addition of two complex 32-bit operands.

Argument:

LeftOpMsb_I

Left operand imaginary part most significant bits.

LeftOpLsb_I

Left operand imaginary part least significant bits.

LeftOpMsb_R

Left operand real part most significant bits.

LeftOpLsb_R

Left operand real part least significant bits.

RightOpMsb_I

Right operand imaginary part most significant bits.

RightOpLsb_I

Right operand imaginary part least significant bits.

RightOpMsb_R Right Operand real part most significant bits.

RightOpLsb_R

Right Operand real part least significant bits.

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 addresses

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

addresses (pointed by Output).

Set the MS bit-field of the MCW register to have a saturated result

(signed arithmetic).

Assembly source

code:

cAdd_32.asm

Code size and cycles: Size: 52 bytes

Instruction cycles: 25

Test:

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

(cAdd_32.in) and an output vector file (cAdd_32.res):

cAdd_32.in is made as follows:

LeftOpMsb_I1, LeftOpLsb_I1, LeftOpMsb_R1, LeftOpLsb_R1,

RightOpMsb_I1, RightOpLsb_I1, RightOpMsb_R1, RightOpLsb_R1,

LeftOpMsb_I2, LeftOpLsb_I2, LeftOpMsb_R2, LeftOpLsb_R2,

RightOpMsb_I2, RightOpLsb_I2, RightOpMsb_R2, RightOpLsb_R2,

...

cAdd_32.res is made as follows:

OutputLsb_R1, OutputMsb_R1, OutputLsb_I1, OutputMsb_I1

OutputLsb_R2, OutputMsb_R2, OutputLsb_I2, OutputMsb_I2,

...

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