確かに、レジスタを自分自身とXORするのはゼロクリアのイディオムですが、なぜSUBではないのでしょうか？
レジスタをゼロクリアする際、XOR命令が最も一般的な方法として定着しましたが、SUB命令でも同様の結果が得られるにもかかわらず、なぜXORが好まれるのかについて考察します。歴史的経緯やパフォーマンス特性、コードサイズなどの要因が関係している可能性があります。
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