fcpsgn

Floating Copy Sign

fcpsgn FRT, FRA, FRB

Copies sign from FRB to FRA.

Encoding

Binary Layout

63

0:5

FRT

6:10

FRA

11:15

FRB

16:20

8

21:30

/

31

 

Format X-form

Opcode 0xFC000010

Extension Floating-Point

Operands

• FRT
  Target
• FRA
  Source
• FRB
  Sign Source

Example

fcpsgn f1, f2, f3

Registers Altered

FPSCR

Related

More in Floating-Point

Reference

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

Description

Copies the sign bit from FRB to FRA, placing the result in FRT. The magnitude of FRA is preserved while the sign is replaced by that of FRB. No exception flags are set.

Operation

FRT ← (abs(FRA) with sign bit from FRB)

Programming Note

Use fcpsgn to change the sign of a floating-point number without altering its magnitude. Ensure both source and target registers are properly aligned and accessible. This instruction operates at user privilege level but may raise exceptions if operands are invalid or if there are precision issues.