Is it possible to coax std::atomic to output CMPXCHG16B for types where I'm not interested in using the atomic interlocked operations on Windows x64, or do I just have to suck it up and do the atom...

#include <stdio.h> // xyz will be emitted with -flto (or if it is static) even when // the function is unused __attribute__((__used__)) void xyz() { printf("Hello World!\n"); } int main()...

Description I'm trying to switch over from using the classic intel compiler from the Intel OneAPI toolkit to the next-generation DPC/C++ compiler, but the default behaviour for handling floating po...

I installed Intel Compiler composer_xe_2013_sp1.3.174 on Linux. I am confused about the icc warnings. Feed icc with a simple program main.c as below: int main(int argc, char **argv) { int a = 1; ...

My problem is that I want to invoke the icc compiler from the command line, but my pc can't find it. I installed the latest oneAPI and sourced setvars.sh. I even search for the icc file under the i...

Does Intel C++ compiler and/or GCC support the following Intel intrinsics, like MSVC does since 2012 / 2013? #include <immintrin.h> // for the following intrinsics int _rdrand16_step(uint16_t...

The Intel C/C++ has a bunch of custom flags, some of which mix compilation and linking, (such as -qopenmp), and others are just idiosyncratic alternative forms (such as -ipp for linking with Intel'...

I want to use Intel's current compiler on Linux. I have an inline macro which is supposed to detect the compiler. It used to work with past versions of GCC and ICC. But now I get extern inline wit...

I'm facing a strange behaviour using Intel C++ compiler 2019 update 5. When I fill a std::map it seems to lead to a non deterministic (?) result. The stl is from VS2019 16.1.6 in which ICC is embed...

I am trying to implement SSE vectorization on a piece of code for which I need my 1D array to be 16 byte memory aligned. However, I have tried several ways to allocate 16byte memory aligned data bu...

How can I have a __TIMESTAMP__ replacement in ISO 8601:2004? __TIMESTAMP__ Sat Jul 6 02:50:06 2013 vs __TIMESTAMP_ISO__ 2013-07-06T00:50:06Z

If I take this code #include <cmath> void compute_sqrt(const double* x, double* y, int n) { int i; #pragma omp simd linear(i) for (i=0; i<n; ++i) { y[i] = std::sqrt(x[i]); } } and co...

In 16.0, the Intel C++ Compiler provided two compilers (one based on EDG, another based on Clang). From the 16.0 documentation: Using the Command Line To invoke the compiler from the command...

Intel's compiler has a pragma that can be used to generate non-temporal stores. For example, I can write void square(const double* x, double* y, int n) { #pragma vector nontemporal for (int i=0; i...

I am very very new to this, I have elf file input.out and need to create hex executable from it. I am using objcopy to create executable in intel hex format as follows objcopy -O ihex input.out ou...

I'm currently trying to compile software for the use on a HPC-Cluster using Intel compilers. The login-node, which is where I compile and prepare the computations uses Intel Xeon Gold 6148 Processo...

Please consider the example below. The class template Sample attempts to initialize reference members using a member function of a template parameter, expected to return an appropriate reference. ...

I'm not very used to using weak_ptr and I'm facing a quite confusing situation. I'm using Intel XE 2019 Composer update 5 (package 2019.5.281) in combinaison with Visual Studio 2019 ver. 16.2.5. I ...

My program links to both PETSc and gsl, and both libraries were compiled with icc. Here's the link command: /usr/local/mpich2/bin/mpicc -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-prag...

unixpreproc.cpp #ifdef unix #warning "unix is defined" #endif #ifdef __unix__ #warning "__unix__ is defined" #endif void main() {} Using Intel C++ compiler 19.0.3: icpc -o unixpreproc unixpre...

I am trying to build the boost library with zlib support on Windows. I need to use the Intel C++ compiler, since I need some features it has. I have been able to build boost with zlib support using...

I wonder how does a Compiler treats Intrinsics. If one uses SSE2 Intrinsics (Using #include <emmintrin.h>) and compile with -mavx flag. What will the compiler generate? Will it generate AVX ...

I figured it was about time to use a fast reciprocal square root. So, I tried writing a function (which would be marked inline in production): float sqrt_recip(float x) { return _mm_cvtss_f32( _m...

Consider the following simple program: #include <cstring> #include <cstdio> #include <cstdlib> void replace(char *str, size_t len) { for (size_t i = 0; i < len; i++) { if (...

I'm doing an experiment and the first step is to unroll a loop (from C/C++) a dozen of times (ex: 10, 50, etc) and output the C/C++ unrolled code. Is there any tool that I can use to automatize suc...