RACW

Round the accumulator word

RACW

Round ACcumulator Word


[Syntax]

RACW src

 

[Operation]

signed long long tmp;

tmp = (signed long long) ACC << src;

tmp = tmp + 0000000080000000h;

if (tmp > (signed long long) 00007FFF00000000h)

ACC = 00007FFF00000000h;

else if (tmp < (signed long long) FFFF800000000000h)

ACC = FFFF800000000000h;

else

ACC = tmp & FFFFFFFF00000000h

[Function]

-

This instruction rounds the value of the accumulator into a word and stores the result in the accumulator.

-

The RACW instruction is executed according to the following procedures.

-

Processing 1:

-

The value of the accumulator is shifted to the left by one or two bits as specified by src

-

Processing 2:

-

The value of the accumulator changes according to the value of 64 bits after the contents have been shifted to the left by one or two bits.

 

[Instruction Format]

Syntax

src

Code size

(Byte)

RACW src

#IMM:1

(IMM:1 = 12)

3

[Flag Change]

-

This instruction does not affect the states of flags.

 

[Description Example]

RACW #1

RACW #2