All instructionsx86-64Move

MOV

Copy data

Copy a register, immediate or memory value to the destination.

x86-64

Instruction forms

9 in this sample
FormBitsRequiresEncoding
MOV r32_dst, r32_src32x86-6489 /r
MOV r32, m3232x86-648B /r
MOV m32, r3232x86-6489 /r
MOV r32, imm3232x86-64b8+r
MOV r64_dst, r64_src64x86-64REX.W + 89 /r
MOV r64, m6464x86-64REX.W + 8B /r
MOV m64, r6464x86-64REX.W + 89 /r
MOV r64, imm6464x86-64REX.W + b8+r
MOV r64, imm3264x86-64REX.W + C7 /0 iz
32 bits

Operation

Pseudo-C · selected form
dst = src

Simplified pseudocode for the selected form.

Exact upstream semantics

Standard variant

Source: intel/MOV-Move.xml/0

let result := src;

Parameterized by register and element size; from the pinned upstream definition.

Architectural details

Flags
RFLAGS unchanged.
Destination
Writes the low 32 bits and clears the corresponding 64-bit register’s upper half.
Encoding
89 /r
Operands
  • r32_dstwrite · 32 bits
  • r32_srcread · 32 bits
Coverage
Selected scalar forms in 64-bit execution mode. 8/16-bit arithmetic, APX and unlisted encoding alternatives are outside this selection.
Exception information & execution requirements
  • #UD

Imported exceptions are checks exposed by this XML form; memory, stack, instruction-fetch and called architectural helpers can introduce additional faults.

Feature availability alone does not guarantee execution: OS state and execution-level controls also apply. Use the linked architecture documentation for the full exception conditions.

Performance measurements are not included in this preview. Latency and throughput depend on the exact form and microarchitecture. Measured data on uops.info ↗

Sources & provenance

Technical fields are imported from pinned upstream files. Explanations and explorer behavior are maintained separately.

Intel · MOV-Move.xml
Revision
4ebe7f0ac1bd00f46244c49bb72c503ce368def7
SHA-256
805d79d9b1b82ac06dff3aaee20f60a4666fdf8ede3ef9239480b881f822d2c9
Terms
Intel SDM terms; see License.md
View pinned upstream file ↗

Intel sources are a documentation preview. Arm ACLE mappings are adapted under CC BY-SA 4.0 with an additional patent license. Arm MRS encoding data is distributed under BSD-3-Clause. © Arm Limited and contributors. Coverage and attribution.