With the new 圆4 architecture and its extended capabilities, a new version of Windows was also needed to take full advantage of those capabilities. Generally, all x86-64 processors are just labelled 圆4 or AMD64. This resulted in the EM64T architecture (later renamed to Intel64). Intel implemented the same instruction set AMD had created, but made some minor changes. After AMD64 was a fact, Intel also started working on an x86-64 processor. Nowadays, 圆4 editions of Windows still carry a AMD64 tag in their build string. AMD’s architecture is often referenced as AMD64. AMD released its first 64-bit processor (the Opteron) in April 2003. ![]() For this reason it was often called x86-64. AMD’s new architecture was an extension of x86 and still supported all legacy instructions. In reaction to Intel’s IA-64 architecture, AMD began development of its own architecture. The first Itanium processor was launched in June 2001. This IA-64 architecture maintained no backwards compatibility with x86 instructions, requiring slow software emulation in order to support existing software. This joint venture resulted in the IA-64 architecture that was used with Intel’s Itanium range of processors. In 1994 Hewlett Packard partnered with Intel to create a new 64-bit architecture based on an earlier development called “EPIC”. When the development of Longhorn began, the 64-bit processors we know today were not yet available. There’s a good reason why these compiles lack lots of features the x86 Longhorn compiles did have. ![]() If you ever bothered to take a look at one of the 64-bit Longhorn compiles, you may have noticed that most of these builds are extremely empty and lack, as one example, the sidebar.
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