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BMI introduced VEX-coded arithmetic and bit manipulation instructions that operate on general purpose registers. AVX-512 introduced 8 mask registers and added VEX-coded instructions to manipulate them. (VEX.B̅ is ignored when the field is used to encode a mask register, but VEX.R̅ and VEX.v̅ 3 are not, and must be set to 1 in 64-bit mode. [5])
The EVEX scheme is a 4-byte extension to the VEX scheme which supports the AVX-512 instruction set and allows addressing new 512-bit ZMM registers and new 64-bit operand mask registers. With Advanced Performance Extensions , the Extended EVEX prefix redefines the semantics of several payload bits.
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:
(Availability of the VEX-encoded 128-bit version is indicated by different CPUID bits: PCLMULQDQ and AVX.) The wider than 128-bit variations of the instruction perform the same operation on each 128-bit portion of input registers, but they do not extend it to select quadwords from different 128-bit fields (the meaning of imm8 operand is the ...
The use of the 8F byte requires that the m-bits (see VEX coding scheme) have a value larger than or equal to 8 in order to avoid overlap with existing instructions. [Note 1] The C4 byte used in the VEX scheme has no such restriction. This may prevent the use of the m-bits for other purposes in the future in the XOP scheme, but not in the VEX ...
Vex'ahlia "Vex" de Rolo, a half-elven ranger / rogue character in the 2015 American web series Critical Role where professional voice actors play the role-playing game Dungeons & Dragons; Vex, a mob from Minecraft summoned by Evokers. Vex, The Gloomist, a playable champion character in the MOBA video game League of Legends
In-line setup creates the test fixture in the same method as the rest of the test. While in-line setup is the simplest test fixture to create, it leads to duplication when multiple tests require the same initial data. Delegate setup places the test fixture in a separate standalone helper method that is accessed by multiple test methods.
VAX was designed as a successor to the 16-bit PDP-11, one of the most successful minicomputers in history with approximately 600,000 units sold. The system was designed to offer backward compatibility with the PDP-11 while extending the memory to a full 32-bit implementation and adding demand paged virtual memory.