How to control or optimize or remove or deallocate unused memory in UNION's
This question about how to control or optimize or remove or deallocate unused memory in unions? We know that the union size is maximum data type descaled inside union. Suppose I declared long type then...
View ArticleProgramming ATtiny10 with Arduino ( "ld.exe" errors)
🤔 IssueI am trying to compile a sketch in "Arduino IDE 1.8.9" for ATtiny10 and i am always getting these errors:When Using ATTiny10...
View ArticleGCC for x86: Optimize sum of two couples of floats
I am compiling the code below, with optimization, and it still looks like there would be a more efficient way of performing the two sums using SIMD capability of the underlying hardware. What would be...
View Articlenew(std::nothrow) int[n] throws and exception
#include <iostream> #include <new> int main() { int n = -1; try { int *p = new(std::nothrow) int[n]; if(!p) std::cout << "new expression returned nullptr\n"; } catch(const...
View Articlenew(std::nothrow) int[n] throws an exception
#include <iostream> #include <new> int main() { int n = -1; try { int *p = new(std::nothrow) int[n]; if(!p) std::cout << "new expression returned nullptr\n"; } catch(const...
View ArticleLinker Script Always Interprets Variables as Zero?
There are a lot of logs and other stuff below, so to skip to the punchline: I have a linker script and am setting variables within it, and using these variables to set up memory sections. But it seems...
View ArticleDoes __attribute__((format work for pure virtual function declarations?
I have a base class and a derived class with following function declarationsclass Base{ public: virtual int myFunction(const char* zFormat,...) = 0; } class Derived : public Base{ public: virtual int...
View ArticlePortable way to declare constexpr array from non-type template arguments
I'm using this approach for a while to do some compile-time c-string manipulations:template<char... args> struct String {static const char data[sizeof...(args)+1];}; template<char... args>...
View ArticleSIGFPE when accessing unordered_map
I have an unordered_map<Block, int> with Block being a simple struct defined as follows:struct Block { size_t start; size_t end; bool operator==(const Block& b) const { return start ==...
View Articlewhy use CROSS_COMPILE variable when we compile C code Makefile?
So I want to cross compile my source code using arm-linux-androideabi-gcc so for this, I write simple C code into files like main.c and main.h now make "Makefile" and write code into this file like,...
View ArticleWhat's the difference between the .ascii and the .string assembler directives?
I know that the .ascii directive doesn't put a null character at the end of the string. The .asciz directive is used for that purpose. However, I don't know whether the .string directive puts a null...
View ArticleHeader file not found while path is included in configure command
Trying to build FFMPeG from source with this configure command./configure --x86asmexe=/home/mahmood/yasm-1.3.0/bin/yasm --enable-cuda --enable-cuvid --enable-nvenc --enable-nonfree --enable-libnpp \...
View Articler - Install rJava on macOS High Sierra with Java 9
I'm looking to install the rJava package on macOS High Sierra with Java 9. The steps I'm following are:Installed Apple Java 6Installed Java 9 from OracleTerminal command: sudo R CMD javareconfAttempted...
View Articlegcc generates unnecessary (?) instructions
I decided to compile a very basic C program and take a look at the generated code with objdump -d.int main(int argc, char *argv[]) { exit(0); } After compiling it with gcc test.c -s -o test.o and then...
View ArticleCan't get built-in inverse trig autovectorization to work (gcc or clang)
I've been trying to get some std::atan2 code to auto vectorize. I've been able to get it to the point where GCC doesn't complain about asin, but it doesn't seem to be able to handle atan2 (nor atan for...
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Unable to see elements of std::vector with gcc in VS code
I'm currently using VS Code to learn C++ because it was easy to setup and is much lighter than VS Studio. However, one thing that I'm unable to do is to see the elements of an array (or string, etc),...
View Articlecodeblocks can't find my compiler
OK, so I downloaded Codeblocks and I already have a cygwin terminal on my computer that I regularly use to compile and run C programs, but when I try to build a program in CodeBlocks, it gives me an...
View ArticleRuntime error using Python Library Keops using CUDA in Ubuntu18.04
I am trying to run samples from the Python library: GeomLoss, which depends on CUDA, Pytorch and Keops in Ubuntu 18.04.3. I downloaded Python3.7 using Anaconda, and I am using CUDA 10.1. The gcc...
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collect2: fatal error: ld terminated with signal 9 [Killed]
I'm trying to build precimonious on Ubuntu 16.04.3 x64. I allocated 1GB memory for it. My file structure looks like~ |--- llvm/ |--- precimonious/ where the llvm is on version 3.0 as mentioned at...
View ArticleHow are 'industrial' lexers written?
I'm taking a course in compilers at my uni and in the section in lexing it mentions that there are several ways to construct a lexer, one being using a lexer generator and the other using regular...
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