Negates the absolute contents of a floating-point register and places the result in another floating-point register.
fnabs | FRT,FRB |
fnabs. | FRT,FRB |
The fnabs instruction places the negative absolute of the contents of floating-point register (FPR) FRB with bit 0 set to 1 into the target FPR FRT.
The fnabs instruction has two syntax forms. Each syntax form has a different effect on Condition Register Field 1.
Syntax Form | Floating-Point Status and Control Register | Record Bit (Rc) | Condition Register Field 1 |
fnabs | None | 0 | None |
fnabs. | None | 1 | FX,FEX,VX,OX |
The two syntax forms of the fnabs instruction never affect the Floating-Point Status and Control Register. If the syntax form sets the Record (Rc) bit to 1, the instruction affects the Floating-Point Exception (FX), Floating-Point Enabled Exception (FEX), Floating-Point Invalid Operation Exception (VX), and Floating-Point Overflow Exception (OX) bits in Condition Register Field 1.
FRT | Specifies target floating-point register for operation. |
FRB | Specifies source floating-point register for operation. |
# Assume FPR 5 contains 0x400C 0000 0000 0000. fnabs 6,5 # FPR 6 now contains 0xC00C 0000 0000 0000.
# Assume FPR 4 contains 0xC053 4000 0000 0000. # Assume CR = 0. fnabs. 6,4 # FPR 6 now contains 0xC053 4000 0000 0000. # CR now contains 0x0.
Floating-Point Move Instructions .
Interpreting the Contents of a Floating-Point Register .