GMS30C2216 datasheet(89/320 Pages) HYNIX

89 / 320 page

Instruction Set

3-27

3.20 Compare Instructions

Two operands are compared by subtracting the source operand or the immediate operand

from the destination operand. The condition flags are set or cleared according to the result;

the result itself is not retained. Note that the N flag indicates the correct compare result

even in the case of an overflow.

All operands and the result are interpreted as either all signed or all unsigned integers.

Format

Notation

Operation

CMP

Rd, Rs

result := Rd - Rs;

Z := Rd = Rs;

-- result is zero

N := Rd < Rs signed;

-- result is true negative

V := overflow;

C := Rd < Rs unsigned;

-- borrow

Rimm

CMPI

Rd, imm

result := Rd - imm;

Z := Rd = imm;

-- result is zero

N := Rd < imm signed;

-- result is true negative

V := overflow;

C := Rd < imm unsigned;

-- borrow

When the SR is denoted as a source operand at CMP, C is subtracted instead of SR. The

notation is then:

Format

Notation

Operation

CMP, Rd, C

result := Rd - C;

Z := Rd = C;

-- result is zero

N := Rd < C signed;

-- result is true negative

V := overflow;

C := Rd < C unsigned;

-- borrow

3.21 Compare Bit Instructions

The result of a bitwise logical AND of the source or immediate operand and the destination

operand is used to set or clear the Z flag accordingly; the result itself is not retained.

All operands and the result are interpreted as bitstrings of 32 bits each.

Format

Notation

Operation

CMPB

Rd, Rs

Z := (Rd and Rs) = 0;

Rimm

CMPBI

Rd, imm

Z := (Rd and imm) = 0;

The following instruction is a special case of CMPBI differentiated by n = 0 (see section

4.3.1. Table of Immediate Values):

Format

Notation

Operation

Rimm

CMPBI

Rd, ANYBZ

Z := Rd(31..24) = 0 or Rd(23..16) = 0 or

Rd(15..8) = 0 or Rd(7..0) = 0;

-- any Byte of Rd = 0

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