x86-64

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Hex machine code for mov immediate to 64-bit register doesn't have a REX.W prefix?
user_175237370
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108
instruction-encoding nasm x86-64 machine-code assembly
Add-Instruction is faster than the processor itself
user_139121320
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84
microbenchmark x86-64 assembly cpu-architecture c
Why does clang make the Quake fast inverse square root code 10x faster than with GCC? (with *(long*)float type punning)
user_81275880
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253
x86-64 clang assembly gcc c++
Does a multiplication of (-1) * (-1) with `imulq` sets the `OF` flag?
user_134483440
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51
multiplication x86-64 assembly
Why does this code execute more slowly after strength-reducing multiplications to loop-carried additions?
user_3820500
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318
7
84930
x86-64 simd assembly cpu-architecture optimization
Performantly reverse the order of 16-bit quantities within a 64-bit word
user_59283410
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swar x86-64 assembly optimization performance
Returning two AVX/AVX2 __m256d types in C++ function calls via registers
user_182387340
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7
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68
avx x86-64 calling-convention assembly c++
"There is no need to deallocate the stack at the end of the function when the inner-stack frame isn't modified", but it is being modified in this case
user_179340590
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45
red-zone stack-frame x86-64 stack-memory assembly
Why do x86 mul and div instructions only take a source operand?
user_125743410
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199
instructions x86-64 instruction-set x86 assembly
How Do I Convert This ATT assembly to Intel Syntax? Jump to a non-relative address without using registers
user_54963400
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att x86-64 intel-syntax assembly
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