dcffix

Decimal Convert From Fixed

dcffix FRT, FRB

Converts a 64-bit integer to DFP.

Encoding

Binary Layout

59

0:5

FRT

6:10

0

11:15

FRB

16:20

802

21:30

/

31

 

Format X-form

Opcode 0xEC000644

Extension Decimal Floating-Point

Operands

• FRT
  Target
• FRB
  Source
• RT
  Target General Purpose Register
• RA
  Source General Purpose Register
• RB
  Source General Purpose Register

Example

dcffix f1, f3

Registers Altered

FPSCR

Related

More in Decimal Floating-Point

Reference

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

Description

Converts a 64-bit signed integer from FRB to a decimal floating-point value and places it in FRT. The integer is interpreted as a two's-complement 64-bit value. The result is an exact representation in the decimal floating-point format. FPSCR is updated if the integer is out of range for DFP.

Operation

integer_value ← FRB[0:63] (signed)
FRT ← convert_to_DFP(integer_value)
FPSCR ← updated based on conversion result