isync
Instruction Synchronize
isync
Ensures that all instructions preceding the isync instruction have completed before it completes, and that no subsequent instructions are initiated until after the isync instruction completes.
Encoding
Binary Layout
19
0:5
00000
6:10
00000
11:15
00000
16:20
150
21:30
/
31
Operands
Related
More in Base
Reference
View in PowerISA v3.1C Specification ↗
OPF Power ISA v3.1C
Description
Executing an isync instruction ensures that all instructions preceding the isync instruction have completed before the isync instruction completes, and that no subsequent instructions are initiated until after the isync instruction completes. It also ensures that all instruction cache block invalidations caused by icbi instructions preceding the isync instruction have been performed with respect to the processor executing the isync instruction, and then causes any prefetched instructions to be discarded.
Operation
ContextSynchronize()Programming Note
Except as described in the preceding sentence, the isync instruction may complete before storage accesses associated with instructions preceding the isync instruction have been performed.