在 2024-05-15 19:39, Segher Boessenkool 写道:
The source code of GAS (well, libopcodes) is the ultimate reference to what instruction syntax is accepted by GAS. See https://sourceware.org/git/?p=binutils-gdb.git;a=blob&f=opcodes/i386-opc.tbl and files around that.
Having read that page, I don't see any syntax construction about CMPXCHG. Given the fact that CMPXCHG looks much similar to MOV, it's reasonable to assume the same convention as MOV; and it is the case.
I don't recommend reading the source code. Both dialects have not been well defined, and both contain a lot of ad-hoc solutions to non-issues, e.g. why is there the `OFFSET` keyword in Intel syntax, and why is `jmp *%rax` not `jmp (%rax)` in AT&T syntax. Compiler output is really the only thing worth reading.
-- Best regards, LIU Hao
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