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What is the best way to set a register to zero in x86 assembly: xor, mov or and?

optimizationperformanceassemblyx86micro-optimization
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Why does mulss take only 3 cycles on Haswell, different from Agner's instruction tables? (Unrolling FP loops with multiple accumulators)

c#assemblyx86micro-optimizationsse
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Can x86's MOV really be "free"? Why can't I reproduce this at all?

c#cpu-architectureassemblyx86micro-optimization
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How exactly do partial registers on Haswell/Skylake perform? Writing AL seems to have a false dependency on RAX, and AH is inconsistent

cpu-architectureassemblyx86micro-optimizationintel
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Test whether a register is zero with CMP reg,0 vs OR reg,reg?

optimizationassemblyx86micro-optimization
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