tsr

Transaction Suspend or Resume

tsr L

Suspends or resumes a transaction based on L.

Encoding

Binary Layout

0:5

6:10

11:15

16:20

750

21:30

Format X-form

Opcode 0x7C0005DE

Extension Transactional Memory

Operands

L
1=Suspend

Example

tsr 0

Registers Altered

MSR

Reference

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

Description

Transaction Suspend or Resume. Suspends an active transaction (L=0) or resumes a suspended transaction (L=1). The transactional state is preserved across the suspend/resume boundary.

Operation

if L = 0 then
  Suspend_Transaction()
else
  Resume_Transaction()

Programming Note

The tsr instruction is used to either suspend or resume a transaction based on the value of the L bit. Ensure that the transactional state is properly managed to avoid data corruption. This instruction operates at the privilege level of the executing context and may raise exceptions if used incorrectly, such as attempting to resume a non-existent suspended transaction.

tsr