pld

Prefixed Load Doubleword

pld RT, D34(RA), R

Loads a 64-bit value from memory using a 34-bit immediate offset (PC-relative or absolute).

Details

Loads a 64-bit doubleword from memory at the address calculated from RA plus a 34-bit immediate displacement, storing the result in RT. When R=1, the displacement is PC-relative; when R=0, it is treated as absolute. This is a 64-bit prefixed instruction from the Prefixed extension.

Pseudocode Operation

if R = 1 then
  EA ← (RA | 0 if RA=0) + sign_extend(D34, 34) + CIA
else
  EA ← (RA | 0 if RA=0) + sign_extend(D34, 34)
RT ← [EA]

Programming Note

The pld instruction is commonly used for loading doubleword data from memory into a register. Ensure the base address and offset are correctly calculated to avoid accessing invalid memory locations. This instruction operates at user privilege level unless specified otherwise.

Example

pld r3, label@pcrel(0), 1

// Load value from label.

Encoding

Binary Layout
1
0
2
6
R
8
0
9
D0
14
57
32
RT
38
RA
43
D1
48
 
Format MLS:D-form
Opcode 0x04000000E4000000
Extension Prefixed

Operands

  • RT
    Target Register
  • D34
    34-bit Displacement
  • RA
    Base Register
  • R
    PC-Relative Flag