lfdp

Load Floating-Point Double Pair

lfdp FRTp,disp(RA)

Loads a doubleword-pair from storage into an even-odd pair of FPRs.

Encoding

Binary Layout

0

0:5

FRTp

6:10

RA

11:15

DS

16:20

0

21:31

 

Format DS-form

Opcode 0xE4000000

Extension Floating-Point

Operands

• FRTp
  Target Floating-Point Register Pair
• RA
  Base General Purpose Register
• disp
  Displacement

Example

lfdp f2, disp(RA)

Related

More in Floating-Point

Reference

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

Description

For lfdp, the doubleword-pair in storage addressed by EA is loaded into an even-odd pair of FPRs with the even-numbered FPR being loaded with the leftmost doubleword from storage and the odd-numbered FPR being loaded with the rightmost doubleword.

Operation

if RA = 0 then
    b ← 0
else
    b ← (RA)
EA ← b + EXTS(DS || 0b00)
FRTpeven ← MEM(EA, 8)
FRTpodd ← MEM(EA + 8, 8)

Programming Note

The instructions described in this section should not be used to access an operand in DFP Extended format when the processor is in Little-Endian mode.