Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?

assemblyx86-64x86cpu-registerszero-extension
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Why is the loop instruction slow? Couldn't Intel have implemented it efficiently?

performancecpu-architectureassemblyx86intel
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Micro fusion and addressing modes

cpu-architectureassemblyx86inteliaca
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How do I print an integer in Assembly Level Programming without printf from the c library?

integerassemblyoutputx86nasm
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Fastest way to do horizontal SSE vector sum (or other reduction)

floating-pointoptimizationassemblyssesimd
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