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It can also be on- or off-chip; what makes it "external" is that it must be accessed using the MOVX (move external) instruction. Many variants of the 8051 include the standard 256 bytes of IRAM plus a few kilobytes of XRAM on the chip. The first 256 bytes of XRAM may be accessed using the MOVX A, @ R0, MOVX A, @ R1, MOVX @ R0, A, and MOVX @ R1 ...
Instructions to load both extended segment register and general-purpose register at once, similar to 8086's LDS and LES instructions MOV DS2,r16,m32: 0F 3E /r: DS2: 63: Segment-override prefixes for the DS2 and DS3 extended segments. DS3: D6: IRAM: F1: Register File Override Prefix. Will cause memory operands to index into register file rather ...
The XSAVE instruction set extensions are designed to save/restore CPU extended state (typically for the purpose of context switching) in a manner that can be extended to cover new instruction set extensions without the OS context-switching code needing to understand the specifics of the new extensions.
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.
The RISC-V instruction set refers to the set of instructions that RISC-V compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor.
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. AMD today advertises the availability of these features via Intel's BMI1 and BMI2 cpuflags and instructs programmers to target them accordingly.
Base instruction 0xD6 add.ovf: Add signed integer values with overflow check. Base instruction 0xD7 add.ovf.un: Add unsigned integer values with overflow check. Base instruction 0x5F and: Bitwise AND of two integral values, returns an integral value. Base instruction 0xFE 0x00 arglist: Return argument list handle for the current method. Base ...
An interactive electronic technical manual (IETM) is a portal to manage technical documentation. IETMs compress volumes of text into just CD-ROMs or online pages which may include sound and video , and allow readers to locate needed information far more rapidly than in paper manuals.