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  2. List of discontinued x86 instructions - Wikipedia

    en.wikipedia.org/wiki/List_of_discontinued_x86...

    The bottom bit of the opcode is used to indicate whether the AVX512 index register is considered a vector of sixteen signed 32-bit indexes (bit 0 not set) or eight signed 64-bit indexes (bit 0 set) The instructions all support operation masking by opmask registers. The only supported vector width is 512 bits.

  3. List of x86 virtualization instructions - Wikipedia

    en.wikipedia.org/wiki/List_of_x86_virtualization...

    Instruction set extensions that have been added to the x86 instruction set in order to support hardware virtualization.These extensions provide instructions for entering and leaving a virtualized execution context and for loading virtual-machine control structures (VMCSs), which hold the state of the guest and host, along with fields which control processor behavior within the virtual machine.

  4. x86 instruction listings - Wikipedia

    en.wikipedia.org/wiki/X86_instruction_listings

    These instructions are also available in 32-bit mode, in which they operate on 32-bit registers (eax, ebx, etc.) and values instead of their 16-bit (ax, bx, etc.) counterparts. The updated instruction set is grouped according to architecture ( i186 , i286 , i386 , i486 , i586 / i686 ) and is referred to as (32-bit) x86 and (64-bit) x86-64 (also ...

  5. FMA instruction set - Wikipedia

    en.wikipedia.org/wiki/FMA_instruction_set

    The FMA instruction set is an extension to the 128 and 256-bit Streaming SIMD Extensions instructions in the x86 microprocessor instruction set to perform fused multiply–add (FMA) operations. [1] There are two variants: FMA4 is supported in AMD processors starting with the Bulldozer architecture. FMA4 was performed in hardware before FMA3 was.

  6. Absoft - Wikipedia

    en.wikipedia.org/wiki/Absoft

    Absoft Pro Fortran on 64-bit platforms supports both 32-bit and 64-bit executables; the user selects which format that the compiler will produce. Linux compilers are available in either 32-bit or 64-bit versions. The 32-bit version produces only 32-bit executables. All are bundled with a graphical debugger and an integrated development environment.

  7. x86-64 - Wikipedia

    en.wikipedia.org/wiki/X86-64

    x86-64 (also known as x64, x86_64, AMD64, and Intel 64) [note 1] is a 64-bit extension of the x86 instruction set architecture first announced in 1999. It introduces two new operating modes: 64-bit mode and compatibility mode, along with a new four-level paging mechanism.

  8. x86 Bit manipulation instruction set - Wikipedia

    en.wikipedia.org/wiki/X86_Bit_manipulation...

    While what these instructions do is similar to bit level gather-scatter SIMD instructions, PDEP and PEXT instructions (like the rest of the BMI instruction sets) operate on general-purpose registers. [12] The instructions are available in 32-bit and 64-bit versions. An example using arbitrary source and selector in 32-bit mode is:

  9. 64-bit computing - Wikipedia

    en.wikipedia.org/wiki/64-bit_computing

    Some 64-bit architectures, such as x86-64 and AArch64, support more general-purpose registers than their 32-bit counterparts (although this is not due specifically to the word length). This leads to a significant speed increase for tight loops since the processor does not have to fetch data from the cache or main memory if the data can fit in ...