instruction-encoding

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Efficiently loading both RAX and R8 with the same small positive number
user_31447700
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3
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54
instruction-encoding x86-64 micro-optimization assembly
What is the action of the GRPL instruction in the I386 instruction set?
user_175279880
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2
2
69
instruction-encoding opcode machine-code x86 assembly
Hex machine code for mov immediate to 64-bit register doesn't have a REX.W prefix?
user_175237370
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2
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108
instruction-encoding nasm x86-64 machine-code assembly
how arm-thumb instruction set's blx instruction support 4MB range
user_163874000
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2
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363
instruction-encoding thumb arm machine-code assembly
ModRM: Can't use direct address, assembly x86
user_75561450
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2
2
106
instruction-encoding machine-code x86 assembly
How does an instruction decoder tell the difference between a prefix and a primary opcode?
user_164657390
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8
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480
instruction-encoding machine-code x86 assembly cpu-architecture
x86 sub instruction opcode confusion
user_33554760
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3
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229
instruction-encoding tasm opcode x86 assembly
Where has Intel documented the encoding of extended registers (R8-R15) in ModR/M byte?
user_167080990
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191
instruction-encoding x86-64 machine-code intel assembly
How to encode an instruction when we just know the hex for opcode
user_123570350
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2
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350
instruction-encoding x86-64 x86 assembly
x86 assembly 16 bit vs 8 bit immediate operand encoding
user_22666380
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3
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1800
instruction-encoding opcode machine-code x86 assembly
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