PM0014 datasheet(14/46 Pages) STMICROELECTRONICS

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Arithmetic library functions

PM0014

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5.2.2

add_32

add_32 (short LeftOpMsb, short LeftOpLsb, short RightOpMsb, short RightOpLsb, long

*Output)

Description:

Addition of two real 32-bit operands.

Argument:

LeftOpMsb

Left operand most significant bits.

LeftOpLsb

Left operand least significant bits.

RightOpMsb

Right operand most significant bits.

RightOpLsb

Right operand least significant bits.

Output

Output pointer.

Algorithm:

LeftOp + RightOp = Output

Note:

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

result (signed arithmetic)

Assembly source code:

add_32.asm

Code size and cycles:

Size: 20 bytes

Instruction cycles: 14

Test:

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

(Add_32.in) and an output vector file (Add_32.res):

Add_32.in is made as follows:

LeftOpMsb1, LeftOpLsb1, RightOpMsb1,

RightOpLsb1

LeftOpMsb2, LeftOpLsb2, RightOpMsb2,

RightOpLsb2

...

Add_32.res is made as follows:

OutputLsb1, OutputMsb1,

OutputLsb2, OutputMsb2,

...

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