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• 14:47, 20 October 2025 Bfh-sts talk contribs created page Sign Extension and Negation (movsx, neg) (Created page with "= Sign Extension and Negation (movsx, neg) = This page explains how to handle signed numbers of different sizes and how to change their sign in x86-64 assembly. == Copying signed numbers == When using mov to copy signed numbers, the sign bit is not automatically extended to the larger register size. This can lead to incorrect values when moving smaller signed values into larger registers. Example: mov ax, -42 mov bx, ax ; bx = -42 (ok, same size) mov ecx, bx...")