zero-extension

What does the MOVZBL instruction do in IA-32 AT&T syntax?

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AT&T syntax splits the movzx Intel instruction mnemonic into different mnemonics for different source sizes (movzb vs. movzw). In Intel syntax, it’s: movzx eax, byte ptr [eax+ecx+1] i.e. load a byte from memory at eax+ecx+1 and zero-extend to full register. BTW, most GNU tools now have a switch or a config option to prefer Intel … Read more

x86_64 registers rax/eax/ax/al overwriting full register contents [duplicate]

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The processor model as documented in the Intel/AMD processor manual is a pretty imperfect model for the real execution engine of a modern core. In particular, the notion of the processor registers does not match reality, there is no such thing as a EAX or RAX register. One primary job of the instruction decoder is … Read more

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