PM0014 datasheet(22/46 Pages) STMICROELECTRONICS

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Arithmetic library functions

PM0014

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5.4.2

mul_q31_q31_q31

mul_q31_q31_q31 (short LeftOpMsb, short LeftOpLsb, short RightOpMsb,

short RightOpLsb, long *Output)

Description:

Multiplication of two real 32-bit fractional operands. Output is on 32

bits.

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:

None

Assembly source

code:

mul_q31_q31_q31.asm

Code size and cycles: Size: 54 bytes

Instruction cycles: 19

Test:

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

(mul_q31_q31_q31.in) and an output vector file

(mul_q31_q31_q31.res):

mul_q31_q31_q31.in is made as follows:

LeftOpMsb1, LeftOpLsb1, RightOpMsb1, RightOpLsb1,

...

mul_q31_q31_q31.res is made as follows:

Output1,...

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