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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.
The ModR/M byte specifies one operand (always a register) with reg field, and the second operand is encoded with mod and r/m fields, specifying either a register or a location in memory. Base-plus-index and scale-plus-index addressing require the SIB byte, which encodes 2-bit scale factor as well as 3-bit index and 3-bit base registers.
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 ...
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.
A woman who saved years' worth of daily text messages from her dad turned them into a sentimental Christmas gift that left her dad in tears. Leah Doherty of Ohio told "Good Morning America" that ...
An 18-year-old was arrested and charged in Houston, Texas after allegedly killing a man during an meetup to purchase a PlayStation 5. The Houston Police Department (HPD) charged Zavion Joshua ...
One week after an Altadena couple — married for more than 30 years and beloved in their neighborhood — was found slain in their home, friends and family held a candlelight vigil in their honor ...
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