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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.
Certain algorithms that rely on having a fixed number of bits in the significand can fail when using 128-bit long double numbers. Because of the reason above, it is possible to represent values like 1 + 2 −1074, which is the smallest representable number greater than 1.
In computer science, arbitrary-precision arithmetic, also called bignum arithmetic, multiple-precision arithmetic, or sometimes infinite-precision arithmetic, indicates that calculations are performed on numbers whose digits of precision are potentially limited only by the available memory of the host system.
Generate a bitmask of all-1s bits up to the lowest bit position with a 1 in the source argument. Returns all-1s if source argument is 0. Equivalent to dst = (src-1) XOR src: BLSR reg,r/m: VEX.LZ.0F38 F3 /1: Copy all bits of the source argument, then clear the lowest set bit. Equivalent to dst = (src-1) AND src: BMI2 Bit Manipulation Instruction ...
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.
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 ...
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.
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) Cryptographic Facility