fcpsgn.

Copy Sign

fcpsgn. FRT,FRB,FRA

Copies the sign of one floating-point number to another.

Encoding

Binary Layout

18

0:5

LI

6:10

AA

11:15

LK

16:31

 

Format X-form

Opcode 0xFC000010

Extension Floating-Point

Operands

• FRT
  Target Floating-Point Register
• FRB
  Source Floating-Point Register (sign source)
• FRA
  Source Floating-Point Register (magnitude source)
• RT
  Target Floating-Point Register
• RB
  Source Floating-Point Register (sign source)
• RA
  Source Floating-Point Register (magnitude source)

Example

fcpsgn. f1, f3, f2

Related

More in Floating-Point

Reference

View in PowerISA v3.1C Specification ↗ OPF Power ISA v3.1C

Description

The fcpsgn. instruction copies the sign bit from the source operand B to the target operand A and places the result in the destination operand C.

Operation

if 'fcpsgn.' then
    RT <- (RA) with sign of (RB)

Programming Note

The fcpsgn. instruction is useful for manipulating the sign of floating-point numbers without changing their magnitude. Ensure that operands A and B are properly aligned in memory to avoid alignment faults. This operation does not require any special privileges and will not generate exceptions under normal circumstances.