Translate asm.md #183
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レビューよろしくお願いします。 |
dalance
reviewed
Oct 25, 2023
src/unsafe/asm.md
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| これは、コンパイラが生成したアセンブリに、NOP (no operation) 命令を挿入します。 | ||
| すべての`asm!`呼び出しは、`unsafe`ブロックの中になければいけません。 | ||
| インラインアセンブリは任意の命令を挿入でき、本来不変のものを変更できてしまうからです。 |
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「不変のものを変更できてしまう」は「不変条件を壊してしまう」でしょうか。
必ずしもmutabilityのことだけではないと思うので。
| このコードは`ebx`がLLVMによって予約されたレジスタであるという制約を回避しています。 | ||
| LLVMは、自身がレジスタを完全にコントロールし、 | ||
| アセンブリブロックを抜ける前に元の状態を復元しなくてはならないと考えています。 | ||
| そのため、コンパイラが`in(reg)`のような汎用レジスタクラスを満たすために使用する場合 **を除いて** `ebx`を入力や出力として利用できません。 |
src/unsafe/asm.md
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| By default, `asm!` assumes that any register not specified as an output will have its contents preserved by the assembly code. The [`clobber_abi`] argument to `asm!` tells the compiler to automatically insert the necessary clobber operands according to the given calling convention ABI: any register which is not fully preserved in that ABI will be treated as clobbered. Multiple `clobber_abi` arguments may be provided and all clobbers from all specified ABIs will be inserted. | ||
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| デフォルトでは、`asm!`は、出力として指定されていないレジスタはアセンブリコードによって保存される、と考えます。 |
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「保存される」というよりは「値が維持される（保たれる）」という感じでしょうか？
（保存されるだとアセンブリ中で明示的にどこかに保存される感じがします）
Co-authored-by: dalance <dalance@gmail.com>
Co-authored-by: dalance <dalance@gmail.com>
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ご対応ありがとうございます。 |
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