• Warning: It blocks containing 32-bit Thumb instructions are deprecated in ARMv8 with GCC 4.9

    Dear colleagues.

    I am compiling the Intel TBB in an effort to optimize my code to the Cortex-M53, however, because I was still forced to use GCC 4.9 I'm getting some warning messages about the use of  32bit Thumb Instrucions in IT blocks:

    Warning…

  • Real Value of PC Register.

    I've been reading books on the ARM Cortex-M architecture and as already mentioned in other post, all the books are consistent in saying that the PC points four bytes (Thumb Instruction Set) forward due to Pipeline (prefetch).

    Did some testing with…

  • From the CPU's point of view, how does it distinguish an assembly code is an ARM code or a Thumb code?

    From the CPU's point of view, how does it distinguish an assembly code is an ARM code or a Thumb code?

    Is there some signal bit represent the code is ARM or Thumb code, this is just my guess.