cpp

Cache Prefetch Prediction Pruning

CPPP <Xt>

Prevents cache prefetch prediction past this instruction.

Pseudocode Operation

Cache_Prefetch_Prediction_Barrier()

Example

CPPP x3

Encoding

Binary Layout

1101010100

31:22

20:19

011

18:16

0111

15:12

0011

11:8

111

7:5

4:0

Format System

Opcode 0xD50B73E0

Extension FEAT_CPP

Operands

Xt
Reg

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD50B73E0	CPP RCTX, <Xt>		A64		1101010100 \| 0 \| 01 \| 011 \| 0111 \| 0011 \| 111 \| Rt

Description

Cache Prefetch Prediction Restriction by Context prevents cache allocation predictions that predict execution addresses based on information gathered from earlier execution within a particular execution context. The actions of code in the target execution context or contexts appearing in program order before the instruction cannot exploitatively control cache prefetch predictions occurring after the instruction is complete and synchronized. For more information, see CPP RCTX, Cache Prefetch Prediction Restriction by Context.

cpp