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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Enhanced REP MOVSB for memcpy

performancecpu-architectureassemblyx86memcpy
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