PM0014 datasheet(26/46 Pages) STMICROELECTRONICS

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Arithmetic library functions

PM0014

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5.5.2

div_q63_q31_q31

div_q63_q31_q31 (short LeftOpMsb, short LeftOp2b, short LeftOp3b,

short LeftOpLsb,short RightOpMsb, short RightOpLsb, long *Output)

Description:

Division of two real fractional inputs. Dividend is on 64 bits, divisor

on 32 bits and quotient on 32 bits.

Argument:

LeftOpMsb

Left operand most significant bits high.

LeftOp2b

Left operand most significant bits low.

LeftOp3b

Left operand least significant bits high.

LeftOpLsb

Left operand least significant bits low.

RightOpMsb

Right operand most significant bits.

RightOpLsb

Right operand least significant bits.

Output

Output pointer.

Algorithm:

LeftOp / RightOp = Output

Note:

The dividend must be smaller than the divisor for a valid result.

Divisions on limits (for example, division of 1 by 1 or of -1 by -1) are

not made by this routine.

The algorithm implemented does not allow integer division. For

dividing two integers (dividend in 64.0 format and divisor in 32.0),

shift the dividend one bit to the left (into 63.1 format) before

dividing.

Assembly source

code:

div_q63_q31_q31.asm

Code size and cycles: Size: 204 bytes

Instruction cycles: 892

Test:

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

(div_q63_q31_q31.in) and an output vector file

(div_q63_q31_q31.res):

div_q63_q31_q31.in is made as follows:

LeftOpMsb1, LeftOp2b1, LeftOp3b1, LeftOpLsb1,

RightOpMsb1, RightOpLsb1

...

div_q63_q31_q31.res is made as follows:

Output1,

...

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