which factors influence performance of these operations? Probably the compiler and compiler version; but does the operating system or the CPU make/model influence this as well? Mostly the processor architecture (and model – please read model where I mention processor architecture in this section). The compiler may have some influence, but most compilers do pretty … Read more
All calculations take place in the registers. When you’re adding (or subtracting, or whatever) variables together in your code, they get loaded from memory into the registers (if they’re not already there, but while you can declare an infinite number of variables, the number of registers is limited). So, having larger registers allows you to … Read more
Another way(without adding i386 architecture)… sudo apt-get install libc6-i386 lib32stdc++6 lib32gcc1 lib32ncurses5 sudo apt-get install lib32z1 Ref: Fix Android adb on Ubuntu 13.10 64bit
Once upon a time, 64-bit Cygwin was missing many packages present in 32-bit Cygwin, but today the list of such packages is quite short. Since that was the last significant reason to create new 32-bit Cygwin installs on 64-bit Windows systems, it is unlikely that you have a good reason to do that today. The … Read more
If you want to compile and link for 32 bit using cmake use this for creating libraries and binaries: Creating libraries: add_library(mylib SHARED my_source.c) set_target_properties(mylib PROPERTIES COMPILE_FLAGS “-m32” LINK_FLAGS “-m32”) creating executables: add_executable(mybin sources.c) set_target_properties(mybin PROPERTIES COMPILE_FLAGS “-m32” LINK_FLAGS “-m32”)
First up, a disclaimer: although I work for Embarcadero. I can’t speak for my employer. What I’m about to write is based on my own opinion of how a hypothetical 64-bit Delphi should work, but there may or may not be competing opinions and other foreseen or unforeseen incompatibilities and events that cause alternative design … Read more
Intrinsic functions are really fast, but still are insufficient for a truly cross-platform, compiler-independent implementation of log2. So in case anyone is interested, here is the fastest, branch-free, CPU-abstract DeBruijn-like algorithm I’ve come to while researching the topic on my own. const int tab64[64] = { 63, 0, 58, 1, 59, 47, 53, 2, 60, … Read more
Word size is a major difference, but it’s not the only one. It tends to define the number of bits a CPU is “rated” for, but word size and overall capability are only loosely related. And overall capability is what matters. On an Intel or AMD CPU, 32-bit vs. 64-bit software really refers to the … Read more
Run a visual studio command prompt to ensure your path can find dumpbin.exe Pipe to findstr to save on the big spew about each section and optionally you can use a wildcard to analyse a folder of libs. dumpbin /headers *.lib | findstr machine Example of what you’re looking for; 8664 machine (x64)