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Arm Cortex-A55 Core Technical Reference Manual : UNPREDICTABLE instructions within an IT Block

UNPREDICTABLE instructions within an IT Block

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.

The Cortex®-A55 core does not implement an unconditional execution policy for the following instructions. Instead all execute conditionally:

  • NEON instructions new to Armv8‑A.
  • All instructions in the Armv8‑A Cryptographic Extension.
  • CRC32.
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