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B.2. unpredictable instructions within an IT Block

Specification

Conditional instructions within an IT Block, described as being unpredictable in the ARM® Architecture Reference Manual ARMv8, for ARMv8-A architecture profile pseudo-code, are executed unconditionally.

Implementation

The Cortex-A53 processor does not implement an unconditional execution policy for the following instructions. Instead all execute conditionally:

  • NEON instructions new to ARMv8.

  • All instructions in the ARMv8 Cryptographic Extensions.

  • CRC32.

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