Re: RFC: Formalization of the Intel assembly syntax (PR53929)

[LIU Hao via Gcc]

在 2024-01-18 17:02, Fangrui Song 写道:

Thanks for the proposal. I hope that -masm=intel becomes more useful:)

Do you have a list of assembly in the unambiguous cases that fail to
be parsed today as a gas PR?
For example,

Not really. Most of these are results from high-level languages. For example:

   # Expected: `movl shr(%rip), %eax`
   # Actual: error: invalid use of operator "shr"
   mov eax, DWORD PTR shr[rip]

   # Expected: `movl dword(%rip), %eax`
   # Actual: accepted as `movl 4(%rip), %eax`
   mov eax, DWORD ptr dword[rip]


In addition, `as -msyntax=intel -mnaked-reg` doesn't seem to be equivalent to 
`.intel_syntax noprefix`:

   $ as -msyntax=intel -mnaked-reg <<< 'mov eax, DWORD PTR gs:0x48' -o a.o
   {standard input}: Assembler messages:
   {standard input}:1: Error: invalid use of register

   $ as <<< '.intel_syntax noprefix;  mov eax, DWORD PTR gs:0x48' -o a.o && 
objdump -Mintel -d a.o
   ...
   0000000000000000 <.text>:
      0:        65 8b 04 25 48 00 00    mov    eax,DWORD PTR gs:0x48



--
Best regards,
LIU Hao

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