ADWC Instruction

Purpose:

To perform extended precision addition

Format:

opcode add.rl, sum.ml

Operation:

sum <- sum + add + C;

Condition
Codes:

N <- sum LSS 0;
Z <- sum EQL 0;
V <- {integer overflow};
C <- {Carry from the most significant bit};

Exceptions:

Integer Overflow

Opcodes:

ADWC

Add Long with Carry

Description:

The sum operand is replaced by the sum of the addend operand, the sum operand and the contents of the C condition code bit. The add operand is unaffected.

Notes:

1.: On overflow, the sum operand is replaced by the low order bits of the true result.
2.: The 2 additions in the operation are performed simultaneously.