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The round constant rcon i for round i of the key expansion is the 32-bit word: [note 2] = [] where rc i is an eight-bit value defined as : = {= > < > where is the bitwise XOR operator and constants such as 00 16 and 11B 16 are given in hexadecimal.
The Athlon 64 X2 is the first native dual-core desktop central processing unit (CPU) designed by Advanced Micro Devices (AMD). It was designed from scratch as native dual-core by using an already multi-CPU enabled Athlon 64, joining it with another functional core on one die, and connecting both via a shared dual-channel memory controller/north bridge and additional control logic.
The minimum strictly positive (subnormal) value is 2 −262378 ≈ 10 −78984 and has a precision of only one bit. The minimum positive normal value is 2 −262142 ≈ 2.4824 × 10 −78913. The maximum representable value is 2 262144 − 2 261907 ≈ 1.6113 × 10 78913.
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The protocol uses compressed elliptic point (only X coordinates), so it allows efficient use of the Montgomery ladder for ECDH, using only XZ coordinates. [6] Curve25519 is constructed such that it avoids many potential implementation pitfalls. [7] The curve is birationally equivalent to a twisted Edwards curve used in the Ed25519 [8] [9 ...
The AMD Radeon R9 290X (Sapphire OEM version pictured here) uses a 512-bit memory bus.. The Intel Xeon Phi has a vector processing unit with 512-bit vector registers, each one holding sixteen 32-bit elements or eight 64-bit elements, and one instruction can operate on all these values in parallel.
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A64 instruction formats; Type Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Reserved 0 op 0: 0: 0: 0: 0 op 1: SME: 1 op 0: 0: 0: 0: 0 Varies Unallocated 0: 0: 0