![]() The call to cpuid is required in order to avoid incorrect mesurements coused by Out of Order Execution, as detailed in the Benchmark Code Execution Paper by Intel. This is the code for the x86-64 assembly file using NASM syntax. ![]() In Rival Fortress rdtsc is used for timing execution of performance critical code. The GetRDTSC() function returns the Time-Stamp Counter and is implemented in Assembly. You can use this as an test main.cpp: #include Įxtern "C" long long GetRDTSC () int main ( int, const char ** ) I suggest you create a blank “Command Line Tool” project in order to test the integration. ![]() Double-check the location of your nasm executable and open Xcode. This will probably install nasm to /usr/local/bin, unless you changed your Homebrew config. ![]() Getting the latest NASMįirst I suggest you install the latest version of NASM using Homebrew like so: brew install nasm Xcode needs a bit of massaging in order to support NASM within a C/C++ project. Last time I talked about how to integrate NASM in a CMake/Clang build, but if you are developing on a Mac you may want to use Xcode to debug your assembly code.
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