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Like the VEX coding scheme, the EVEX prefix unifies existing opcode prefixes and escape codes, memory addressing and operand length modifiers of the x86 instruction set. The following features are carried over from the VEX scheme: Direct encoding of three SIMD registers (XMM, YMM, or ZMM) as source operands (MMX or x87 registers are not supported);
The REX prefix provides additional space for encoding 64-bit addressing modes and additional registers present in the x86-64 architecture. Bit-field W changes the operand size to 64 bits, R expands reg to 4 bits, B expands r/m (or opreg in the few opcodes that encode the register in the 3 lowest opcode bits, such as "POP reg"), and X and B expand index and base in the SIB byte.
AVX-512 vector instructions may indicate an opmask register to control which values are written to the destination, the instruction encoding supports 0–7 for this field, however, only opmask registers k1–k7 (of k0–k7) can be used as the mask corresponding to the value 1–7, whereas the value 0 is reserved for indicating no opmask ...
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AMD was the first to introduce the instructions that now form Intel's BMI1 as part of its ABM (Advanced Bit Manipulation) instruction set, then later added support for Intel's new BMI2 instructions.
Mortgage and refinance rates for Dec. 26, 2024: Rates for 30-year, 15-year fixed terms climb higher week over week. Kelly Suzan Waggoner. December 26, 2024 at 3:53 AM.
FIRST Tech Challenge (FTC), formerly known as FIRST Vex Challenge, is a robotics competition for students in grades 7–12 to compete head to head, by designing, building, and programming a robot to compete in an alliance format against other teams.
It estimated shoppers will spend a record $13.2 billion, up 6.1% year-over-year. Shopify, an e-commerce site, reported that it set a new record for its Black Friday sales, which reached $5 billion ...