crc32d

Cyclic Redundancy Check 32-bit Doubleword

crc32d RA, RS

Accumulates a CRC32 checksum using the doubleword in RS.

Encoding

Binary Layout

31

0:5

RS

6:10

RA

11:15

0

16:20

714

21:30

/

31

 

Format X-form

Opcode 0x7C0002CA

Extension Base

Operands

• RA
  Target/Accumulator
• RS
  Data

Example

crc32d r4, r3

Related

More in Base

Reference

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

Description

Accumulates a CRC32 checksum by processing the 64-bit doubleword in RS using the Castagnoli polynomial. The result is XORed with the accumulator in RA and stored back to RA. This instruction is part of the Base extension and does not affect condition registers or status fields.

Operation

RA ← CRC32(RA, RS[0:63])