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  2. 128-bit computing - Wikipedia

    en.wikipedia.org/wiki/128-bit_computing

    The DEC VAX supported operations on 128-bit integer ('O' or octaword) and 128-bit floating-point ('H-float' or HFLOAT) datatypes. Support for such operations was an upgrade option rather than being a standard feature. Since the VAX's registers were 32 bits wide, a 128-bit operation used four consecutive registers or four longwords in memory.

  3. Quadruple-precision floating-point format - Wikipedia

    en.wikipedia.org/wiki/Quadruple-precision...

    In computing, quadruple precision (or quad precision) is a binary floating-point–based computer number format that occupies 16 bytes (128 bits) with precision at least twice the 53-bit double precision. This 128-bit quadruple precision is designed not only for applications requiring results in higher than double precision, [1] but also, as a ...

  4. IBM hexadecimal floating-point - Wikipedia

    en.wikipedia.org/wiki/IBM_hexadecimal_floating-point

    * IBM documentation numbers the bits from left to right, so that the most significant bit is designated as bit number 0. 28 hexadecimal digits of precision is roughly equivalent to 32 decimal digits. A conversion of extended precision HFP to decimal string would require at least 35 significant digits in order to convert back to the same HFP value.

  5. x86 SIMD instruction listings - Wikipedia

    en.wikipedia.org/wiki/X86_SIMD_instruction_listings

    The x86 instruction set has several times been extended with SIMD (Single instruction, multiple data) instruction set extensions.These extensions, starting from the MMX instruction set extension introduced with Pentium MMX in 1997, typically define sets of wide registers and instructions that subdivide these registers into fixed-size lanes and perform a computation for each lane in parallel.

  6. z/Architecture - Wikipedia

    en.wikipedia.org/wiki/Z/Architecture

    16 64-bit control registers (CRs) introduced by System/370 16 64-bit floating-point registers (FPRs) 32 128-bit vector registers (VRs); bits 0-63 of VR0-VR15 contain FPR0-FPR15 1 32-bit floating point control (FPC) register 1 128-bit processor status register (PSW), which includes a 64-bit instruction address An 8-KiB prefix storage area (PSA)

  7. 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 ...

  8. List of x86 cryptographic instructions - Wikipedia

    en.wikipedia.org/wiki/List_of_x86_cryptographic...

    Wrap a 256-bit AES key from XMM1:XMM0 into a 512-bit key handle - and output this handle to XMM0-3. AESENC128KL xmm,m384: F3 0F 38 DC /r: Encrypt xmm using 128-bit AES key indicated by handle at m384 and store result in xmm. [c] AESDEC128KL xmm,m384: F3 0F 38 DD /r: Decrypt xmm using 128-bit AES key indicated by handle at m384 and store result ...

  9. Intel 5-level paging - Wikipedia

    en.wikipedia.org/wiki/Intel_5-level_paging

    Intel 5-level paging, referred to simply as 5-level paging in Intel documents, is a processor extension for the x86-64 line of processors. [1]: 11 It extends the size of virtual addresses from 48 bits to 57 bits by adding an additional level to x86-64's multilevel page tables, increasing the addressable virtual memory from 256 TiB to 128 PiB.