clrex

Clear Exclusive (Thumb)

CLREX

Clears exclusive monitor (Thumb).

Pseudocode Operation

ExclusiveMonitors.Clear()

Encoding

Binary Layout

111100111011

31:20

1

19

1

18

1

17

1

16

10

15:14

0

13

0

12

1

11

1

10

1

9

1

8

0010

7:4

1111

3:0

 

Format Thumb System

Opcode 0xF3BF8F2F

Extension A32 (Atomic)

Operands

Related

Other forms of clrex

• clrex Clear Exclusive (System)
• clrex Clear Exclusive (A32)

More in A32 (Atomic)

Reference

View in Arm A64 ISA Reference ↗ Arm AArch32 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xF57FF01F	CLREX{<c>}{<q>}		A32		111101010111 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0001 | 1111
0xF3BF8F2F	CLREX{<c>}{<q>}		T32		111100111011 | 1 | 1 | 1 | 1 | 10 | 0 | 0 | 1 | 1 | 1 | 1 | 0010 | 1111

Description

Clear-Exclusive clears the local monitor of the executing PE.

Operation

if ConditionPassed() then
    EncodingSpecificOperations();
    ClearExclusiveLocal(ProcessorID());