Negates the absolute value of the contents of a general-purpose register and stores the result in another general-purpose register.
Note: The nabs instruction is supported only in the POWER architecture.
The nabs instruction places the negative absolute value of the contents of general-purpose register (GPR) RA into the target GPR RT.
The nabs instruction has four syntax forms. Each syntax form has a different effect on Condition Register Field 0 and the Fixed-Point Exception Register.
|Syntax Form||Overflow Exception (OE)||Fixed-Point Exception Register||Record Bit (Rc)||Condition Register Field 0|
The four syntax forms of the nabs instruction never affect the Carry bit (CA) in the Fixed-Point Exception Register. If the syntax form sets the Overflow Exception (OE) bit to 1, the Summary Overflow (SO) bit is unchanged and the Overflow (OV) bit is set to zero. If the syntax form sets the Record (Rc) bit to 1, the instruction affects the Less Than (LT) zero, Greater Than (GT) zero, Equal To (EQ) zero, and Summary Overflow (SO) bits in Condition Register Field 0.
|RT||Specifies target general-purpose register where result of operation is stored.|
|RA||Specifies source general-purpose register for operation.|
# Assume GPR 4 contains 0x0000 3000. nabs 6,4 # GPR 6 now contains 0xFFFF D000.
# Assume GPR 4 contains 0xFFFF FFFF. nabs. 6,4 # GPR 6 now contains 0xFFFF FFFF.
# Assume GPR 4 contains 0x0000 0001. nabso 6,4 # GPR 6 now contains 0xFFFF FFFF.
# Assume GPR 4 contains 0x8000 0000. nabso 6,4 # GPR 6 now contains 0x8000 0000.
Fixed-Point Arithmetic Instructions.