icread

Instruction Cache Read

icread RA, RB

Reads an instruction cache tag or data (Debug).

Details

Reads and returns an instruction cache tag or data value from the address RA + RB into a read port. This is an embedded debug/diagnostic instruction used to inspect instruction cache contents; exact behavior (tag vs. instruction read, selection mechanism) is implementation-dependent. The instruction requires supervisor privilege and may not be available on all embedded PowerPC implementations.

Pseudocode Operation

addr ← (RA) + (RB)
Read instruction cache entry at addr

Example

icread r4, r5

Encoding

Binary Layout
31
0
/
6
RA
11
RB
16
998
21
/
31
 
Format X-form
Opcode 0x7C0007CE
Extension Embedded

Operands

  • RA
    Base
  • RB
    Index