Yasm extends the base NASM syntax to support AMD64 as follows. To enable assembly of instructions for the 64-bit mode of AMD64 processors, use the directive BITS 64. As with NASM's BITS directive, this does not change the format of the output object file to 64 bits; it only changes the assembler mode to assume that the instructions being assembled will be run in 64-bit mode. To specify an AMD64 ob
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