trechkpt

Transaction Recheckpoint

trechkpt

Updates the transaction checkpoint.

Encoding

Binary Layout

31

0:5

/

6:10

/

11:15

/

16:20

1006

21:30

/

31

 

Format X-form

Opcode 0x7C0007DD

Extension Transactional Memory

Operands

Registers Altered

LR, CTR, CR, FPSCR, XER, MSR, SRR0, SRR1, TAR

Related

More in Transactional Memory

Reference

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

Description

Transaction Recheckpoint. Restores the transactional register state from the checkpoint saved by a prior tbegin. Used to restart a transaction after a non-transactional abort.

Operation

if Suspended() then
  Restore_Checkpoint()
  Resume_Transaction()

Programming Note

The trechkpt instruction is used to restore the transactional register state from a previous checkpoint, allowing a transaction to be restarted after a non-transactional abort. It should only be used within a transactional region and requires that the transaction was previously suspended. Ensure proper ordering of instructions to maintain consistency and avoid data corruption.