Search results
Results from the WOW.Com Content Network
Hans and DarkDust answer covered i386/i686 and amd64/x86_64, so there's no sense in revisiting them. This answer will focus on X32, and provide some info learned after a X32 port. x32 is an ABI for amd64/x86_64 CPUs using 32-bit integers, longs and pointers. The idea is to combine the smaller memory and cache footprint from 32-bit data types ...
In x86 there are 8 32 bit registers, in x64 the registers are 64 bits each and there are 8 more of them. The 128 bit SSE registers are 128 bits in both, but on x86 there are 8 of them while in x64 there are 16 of them. Also some instructions were cut in x64. In x64 mode you can still use the registers as 32 bits by using their 32 bit name ...
After installing VC++ 2013 update for an x86-based application, the x64 Visual C++ 2013 runtime libraries are missing. For example, Installing the “Visual C++ Redistributable 2013 x86 v12.0.30501” removes binaries for non-target architectures i.e “Visual C++ Redistributable 2013 v12.0.21005” x86 and x64!
Technically x86 simply refers to a family of processors and the instruction set they all use. It doesn't actually say anything specific about data sizes. x86 started out as a 16-bit instruction set for 16-bit processors (the 8086 and 8088 processors), then was extended to a 32-bit instruction set for 32-bit processors (80386 and 80486), and now ...
10. The difference is that Java binaries compiled as x86 (32-bit) or x64 (64-bit) applications respectively. On a 64-bit Windows you can use either version, since x86 will run in WOW64 mode. On a 32-bit Windows you should use only x86 obviously. For a Linux you should select appropriate type x86 for 32-bit OS, and x64 for 64-bit OS.
deploy the x86 package only or; deploy both packages and install x86 on 32-bit windows and x64 on 64-bit windows? The answer to this question 32-bit VC++ redistributable on 64 bit OS? suggests that it's only the x86 package, so it would be dependent on my application but it doesn't give any explanation/links. The MS download sites are also not ...
For example, after installing Debugging Tools for Windows (x86) on XP, it's found in Program Files but on Windows 7 it's found on Program Files (x86) which means there's no simple way to create a command file that can be distributed across all computers since none of the built-in environment variables consistently point to the 32-bit location ...
7. edi is a register, a general purpose one which is generally used to hold the destination for string operations (scas etc.) But as any other general purpose register, can be used to hold any other data. In general, forget about "types" in assembly: assembly is not a typed language, or better any data is just bytes.
x86-based machines have two independent address spaces - the memory address space you're familiar with, and then the I/O address space. I/O port addresses are only 16 bits wide, and reference low-level registers and other low-level widgets that are part of an I/O device - something like a serial or parallel port, disk controller, etc.
ORG (abbr. for ORiGin) is an assembly directive and is not an instruction. It defines where the machine code (translated assembly program) is to place in memory. As for ORG 100H this deals with 80x86 COM program format (COMMAND) which consists of only one segment with a maximum of 64k bytes.