diexq.

DFP Insert Biased Exponent Quad X-form

diexq. RT,RA,RB

Inserts the biased exponent from a source register into a destination register in quad format.

Encoding

Binary Layout

111111

0:5

RT

6:10

RA

11:15

RB

16:20

11011

21:25

00010

26:30

Rc

31

 

Format X-form

Opcode 0xFC0006C4

Extension Decimal Floating-Point

Operands

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

Example

diexq. r3, r4, r5

Related

More in Decimal Floating-Point

Reference

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

Description

Inserts a biased exponent from a source general-purpose register into a quad-precision decimal floating-point number, replacing the exponent field of the destination. The instruction requires Decimal Floating-Point (DFP) support. The update form (indicated by the dot) sets condition register field CR0 based on the result classification (zero, normal, infinity, or NaN).

Operation

exponent ← RA[32:63]
RT ← insert_exponent_into_DFP_quad(RB, exponent)
if Rc = 1 then CR0 ← classify_DFP_result(RT)

Programming Note

When Rc=1, CR1 is set from the FPSCR[FX, FEX, VX, OX] bits immediately after the operation completes.