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重複の可能性: ほとんどの x64 命令が 32 レジスタの上位部分をゼロにする理由
を実行してmovl something, %eax0x1234567812345678raxのようなものを含めた場合、上半分が自動的にゼロになりraxますか?
movl something, %eax
rax