Operations:

Format

Syntax:

Operation:

Operands:

Architecture revision

Opcode

1

incjosp imm 

if ( JOSP[3:0] + imm < 0 ) 
      TRAP 4
else if (JOSP[3:0] + imm > 8 ) 
      TRAP 3
else
      JOSP = JOSP + imm;
 
imm ∈ {-4, -3, -2, -1, 1, 2, 3, 4}

Rev1+

110101101

imm3

0011

9

3

4

Description

Increment the system register "Java Operand Stack Pointer" with value.

imm3

imm

100

-4

101

-3

110

-2

111

-1

000

1

001

2

010

3

011

4

Status Flags:

Q:

Not affected

V:

Not affected

N:

Not affected

Z:

Not affected

C:

Not affected

Note:

When trapped, this instruction will destroy R12. It is the programmer's responsibility to keep the R12value if needed.