You need to make GCC use the -m32 flag. You could try writing a simple shell script to your $PATH and call it gcc (make sure you don’t overwrite the original gcc, and make sure the new script comes earlier in $PATH, and that it uses the full path to GCC. I think the code … Read more
If you’re using .NET 4.0, it’s a one-liner for the current process: Environment.Is64BitProcess Reference: Environment.Is64BitProcess Property (MSDN)
syscall is the default way of entering kernel mode on x86-64. This instruction is not available in 32 bit modes of operation on Intel processors. sysenter is an instruction most frequently used to invoke system calls in 32 bit modes of operation. It is similar to syscall, a bit more difficult to use though, but … Read more
x86 is the name of the architecture that it’s built to run on (the name comes from a series of old Intel processors, the names of which all ended in 86, The first of which was the 8086). Although x86 was originally a 16-bit architecture, the version in use today is the 32-bit extension. x64 … Read more
I typically see a 30% speed improvement for compute-intensive code on x86-64 compared to x86. This is most likely due to the fact that we have 16 x 64 bit general purpose registers and 16 x SSE registers instead of 8 x 32 bit general purpose registers and 8 x SSE registers. This is with … Read more
If you’re shell is running on .NET 4.0 (PowerShell 3.0): PS> [Environment]::Is64BitProcess True
Yes, Java bytecode (and source code) is platform independent, assuming you use platform independent libraries. 32 vs. 64 bit shouldn’t matter.
Reading the 64 bit registry is possible because of WOW64 which is a Windows subsystem providing access to 64 bit from within 32 bit applications. (Likewise, in older NT-based Windows versions it was called WOW and was an emulation layer inside 32 bit Windows to support 16 bit applications). There is still native support for … Read more
I’d say this is the modern C++ way: #include <cstdint> void *p; auto i = reinterpret_cast<std::uintptr_t>(p); EDIT: The correct type to the the Integer So the right way to store a pointer as an integer is to use the uintptr_t or intptr_t types. (See also in cppreference integer types for C99). These types are defined … Read more
export CFLAGS=-m32