operating system - What does 128-bit OS mean to a software …
网页2011年10月3日 · The 128-bit thing is only about the width of data words, not the size of pointers. These two were the same in 32- and 64-bit, but they have been different in 8-bit computers that addressed 64KiB of memory, and would be different again. 128-bit pointers are probably not going to happen on this planet, because of physic contraints, assuming one atom is necessary to encode one bit.
operating system - Can you work on a 128-bit OS before a 128-bit ...
网页2015年10月14日 · Also, without emulation, a C compiler can be modified to support larger int and long variables by increasing the instructions to chain 2 64 bit values into 128 bit value, or four 64 bit values into a 256 bit value. So, ignoring memory limitations, the code designed for a 128 bit processor could be run on a 64 bit processor.
128 bit integer with c on windows? - Stack Overflow
网页2011年6月20日 · SSE does not provide 128 bit integers, it provides only vectors of smaller integers (8-64 bit) which have a size of 128 bit as a whole. – Gunther Piez Commented Oct 4, 2012 at 15:28
What is the bit size of long on 64-bit Windows? - Stack Overflow
网页For those of use who've been around long enough, the 64-bit transition has some parallels with the 16-bit to 32-bit transition of the mid-80s. There were computers that were IL32 and others that were L32 (adapting the new notation to the old problem). Sometimes 'int' was 16-bit, sometimes 32-bit. – Jonathan Leffler.
Using C#, how to get whether my machine is 64bit or 32bit?
网页2011年8月11日 · The value of this property is 4 in a 32-bit process, and 8 in a 64-bit process. You can define the process type by setting the /platform switch when you compile your code with the C# and Visual Basic compilers.
Why does a 32-bit OS support 4 GB of RAM? - Stack Overflow
网页2009年7月13日 · Because 32 bits are able to represent numbers up to 2 32 − 1 = 4294967295 = 4 GiB − 1 and therefore address up to 2 32 individual bytes which would be 4 GiB then. There are ways to circumvent that, though. For example using PAE even a 32-bit operating system can support more memory. Historically …
How to detect Windows 64-bit platform with .NET?
网页2008年12月3日 · 297. In a .NET 2.0 C# application I use the following code to detect the operating system platform: string os_platform = System.Environment.OSVersion.Platform.ToString(); This returns "Win32NT". The problem is that it returns "Win32NT" even when running on Windows Vista 64-bit.
Question about 32-bit / 64-bit systems - Stack Overflow
网页2010年6月25日 · A 64-bit processor can run a 64-bit operating system or a 32-bit operating system (with a loss of efficiency). This depends very much on the processor. Intel's IA-64 chips can't run 32-bit operating systems because they don't really have 32-bit instructions (if memory serves). About the only way you could run a 32-bit OS on one is if you ...
What are 16, 32 and 64-bit architectures? - Stack Overflow
网页2010年8月29日 · 2. The difference comes down to the bit width of an instruction set passed to a general purpose register for operating on. 16 bits can operate on 2 bytes, 64 on 8 bytes of instruction at a time. You can often increase throughput of a processor by executing more dense instructions per clock cycle.
x86 - Is there hardware support for 128bit integers in modern ...
网页2015年12月11日 · x86 Architecture. On x86, multiplying two 32-bit integers to create a 64-bit integer can be done with the the MUL instruction resulting in a unsigned 64-bit in EDX:EAX, or 128-bit result in RDX:RAX pair. Adding 64-bit integers on x86 requires only two instructions (add / adc thanks to the carry flag), same for 128-bit on x86-64.