In normal C++ we can dynamically allocate an array of floats using either the standard library function malloc or the new keyword. When we think of SIMD vectors, that come as compiler extensions like float32x4_t (for ARM neon), is it safe to dynamically allocate an array of such SIMD vectors like this: uint32_t number_req = ..
Category : arm
I just installed VS code on my M1 mac and I have clang installed along with the c/c++ extension with the code runner and still when I execute this basic program, I get this error. lang: error: linker command failed with exit code 1 (use -v to see invocation) Source: Windows Que..
In this Question , I need to implement a simple encryption and decryption algorithm in ARM assembly. Given a text message (string) stored in the memory, the encryption program gets the ASCII code of each character and apply this method *the method is: Invert the first and the second bits of the ASCII code of ..
I’m having a hard time cross-compiling an embedded Rust project for Cortex-M4 in Windows. Going through the Embedded Rust book, I understood that it is needed to install the necessary target and toolchain. I’m trying to do this as follows (in a Windows cmd session): > rustup target add thumbv7em-none-eabihf info: component ‘rust-std’ for target ..
I was reading this SO question and found that best practice is to return by a value. so I ran below two examples in godbolt with ARM gcc 10.2(linux) compiler to get assembly instructions for both 1. #include <iostream> #include <vector> std::vector<int> return_vector(void) { std::vector<int> tmp {1,2,3,4,5}; return tmp; } int main() { std::vector<int> && ..
I meet a strange problem when try insert a std::set to another Code maybe like below set<A> sa {}; set<A> sb {a ,b, c}; sa.insert(sb.begin(), sb.end()); it’s OK on most of archs But on one ARM env it core dumped for all usage like this added If I replace with below code also can pass ..
I’d like to perform polynomial multiplication of two uint64_t values (where the least significant bit (the one got by w&1) is the least significant coefficient (the a0 in for w(x)=∑iai*xi )) on ARM and get the least significant 64 coefficients (a0…a63) of the result as uint64_t (so result>>i&1 is ai). It’s not clear to me, ..
I have a byte-array of length 32, 64, or 128 bytes. This array is aligned to the cache-line length (32 bytes). I need to answer the query: is there any instance in this array of the specific byte. I don’t need to know the position of this instance, only the existence. Also, I know that ..
I am trying to cross compile. Actually, I am knew in it. I need to flash the linux operating system on Tx6U-8130 board from KaRo electronics. I downloaded the files arm-linux_src.tar.bz2, gcc-arm-cortexa9-linux-gnueabi.tar.bz2 and tool-chain-src.tar.bz2 from KaRo Electronics website. I am using kali-linux and my umane -m is x86_64. I have created 2 folders this mkdir ..
The following code: #include <cstdint> uint8_t res{}; //__attribute__ ((noinline)) static uint8_t reverse_bits() { uint32_t word = 10; asm("rbit %1,%0" : "=r"(word) : "r"(word)); word >>= 24; return word; } void calc() { res ^= reverse_bits(); } int main() { calc(); return res; } Produces this assembler code when compiled with Os on GCC ARM 9.3: ..
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