Hi,
I am using IDE Xilinx SDK 2019.1 for my application and running it on ARM cortex a53 processor with Neon and floating point engine support available. I am working on a bare metal application.
The problem I am facing is that, I am unable to understand…
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…
I am using ARMv8 GCC compiler and I would like to optimize Neon Intrinsics code for better execution time performance. I have already tried loop unrolling and I am using look up table for the computation of log10. Any ideas?
Here is the code:
static inline…
Hello everyone,
I am having difficulties on compiling Ne10 library with ArmCompiler 5. As I understand, Ne10 library requries a GNU compiler, or ArmCompiler 6 which is more GNU like, however currently we are using ARM Compiler 5 in our project.
Is there…
I'm having trouble finding any informations on partial neon register dependencies.
Take for example the following code:
ld2 {v0.16b, v1.16b}[0], [x0]
ld2 {v0.16b, v1.16b}[1], [x1]
ld2 {v0.16b, v1.16b}[2], [x2]
...
Does the second load have to wait…
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…
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.…
Hello all,
I wrote end embedded assembly function for an ARM Cortex A9 (the specific device is Zynq, from Xilinx) as follow
float my_fun(float x)
{
asm volatile ("vdup.f32 d0, r0 \n\t");…
Hello,
forgive me if my question is a litte bit weak in content and linguistic. I'm only a Hobbyist and english is not my nativ.
I'm trying to compile an App from Einstein@Home for AARCH64 using GCC. Einstein@Home is a DC-Projekt using Boinc. The App…
Dear,
I am an greenhand developer on cortex-a15.
now I need some specification as follows:
where I can get the instruction set of cortex-A15?
are there some documents about optimization technology on cortex-A15(image processing optimization)
Thanks a lot.
HI,why the VFP vector mode can not be used in cortex-a series processors?
Hi, can anyone suggest me how to know the instructions cycle timing of the arm_v8 instructions.does it take more cycles to transmit from neon to basic arm instructions in arm_v8.
please suggest me how to calculate instruction cycles in arm_v8
In NEON spec:
VCLS (Vector Count Leading Sign bits) counts the number of consecutive bits following the topmost bit, that are the same as the topmost bit, in each element in a vector, and places the results in a second vector.
VCLZ (Vector Count Leading…
The cortex-A7's pipeline support dual-issue, so I want to ask what's the dual-issue mean?
I find some answers say that dual-issue means that the cortex-A7 can issue two instructions per clock.
But in the cortex-A7's pipeline diagraph, it has integer…
Hi,
I have used some 32-bit microprocessor cores (non-ARM), which has a long word-length accumulator for some DSP operations, to avoid over-flow etc. After I check A8 core document, it is a surprise that I do not see any about this specification. It looks…
For the view of architecture, why the coprocessor is removed for A64 instruction set?
Hi Experts,
What is the trap control feature and its typical use case of the same ?
How instruction enable/disable feature in ARMv8 is useful ?
Regards,
Techguyz
Brief explanation of each stage of ARM pipe-lining.
How many Neon pipeline stages are their?
What is dual issue in ARM pipe-lining?
Our project only wants 2 cores to support NEON for cost reasons. How can I do this?
1. Can a single cluster be done?
2. Cut into 2 clusters, each with 2 cores. What is the difference between the performance of ARM HMP scheduling 4 cores and the performance…
Hi,
I am using A9 Processor on Zynq Board running a test project with neon and simd options enabled . In my code i have nested loops which is not vectorised and below is the build log
not vectorized: multiple nested loops.
Can anyone help me on thi…
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.
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