• compiler optimization options for ARMv8 GCC compiler on ARM cortex a53 (bare metal application)

    khan777
    khan777

    I am using ARMv8 GCC compiler(aarch64-none-elf-gcc) for my bare metal application on ARM cortex a53. I am using neon intrinsics with plain C in my code so I would like to ensure to use all optimization option available for this compiler.

    I tried -mfpu…

    • 2 months ago
    • Processors
    • Cortex-A / A-Profile forum
  • What is arrangement specifier(.16b,.8b) in ARM assembly language instructions?

    surajrgupta
    surajrgupta

    I want to what exactly is arrangement specifier in arm assembly instructions.

    I have gone through ARM TRMs and i think if it is size of Neon register that will be used for computation

    for e.g. TBL Vd.Ta, {Vn.16B,Vn+1.16B }, Vm.Ta

    they mentioned Ta to…

    • 10 months ago
    • Processors
    • Cortex-A / A-Profile forum
  • I'm not seeing any flush-to-zero (FTZ) effects with NEON intrinsics on an ARM A9, any advice?

    David L
    David L

    Hi everyone,

    As the title states - I've had issues reproducing flush-to-zero (FTZ) using the NEON intrinsics provided in the 'arm_neon.h' header. For test purposes I'm using an iPhone 6 with an ARMv8-A dual-core ('Twister') CPU.…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Memory barrier (DSB, DMB). Does they guarantee writing data on cache to memory?

    Yeo Reum Yun
    Yeo Reum Yun

    Hi Experts,

    I'm reading white paper for ARMv7 and ARMv8.

    but when i reading cache part and memory re-ordering, i have silly questions.....

    Suppose there are below instructions..

     

    Core A:

         STR R0, [Msg]

         STR R1, [Something…

    • Answered
    • over 5 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • No segmentation fault when expected with aligned load and store

    aketh
    aketh

    Hi all,

    It is a well known fact that performing an aligned vector load with an unaligned memory address should lead to segmentation fault.

    However, when I do try to run code segment below using the same, i do not see any segmentation fault.

    ---------…

    • over 1 year ago
    • Processors
    • Cortex-A / A-Profile forum
  • View related content throughout Processors
  • More
  • Cancel