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4.1.1. Deprecated registers

In ARMv7-A the following have instruction set equivalents:

  • Instruction Synchronization Barrier

  • Data Synchronization Barrier

  • Data Memory Barrier

  • Wait for Interrupt.

The use of the registers is optional and deprecated.

In addition, the Fast Context Switch Extensions are deprecated in ARM v7 architecture, and are not implemented in the Cortex-A9 processor.

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