[LLVMdev] Intel vs. AT&T Assembly.

[Aaron Gray]

Jeff,

I had a working MASM Writer backend but it never got committed. I still have the code so could redo it relatively quickly.

Aaron

  ----- Original Message ----- 
  From: Jeff Cohen 
  To: LLVM Developers Mailing List 
  Sent: Saturday, April 29, 2006 7:56 PM
  Subject: Re: [LLVMdev] Intel vs. AT&T Assembly.


  We know.  Someone offered to do the Intel version, but did little more than a huge cut and paste of the AT&T version and then lost interest.  No one else has had the time or inclination to finish the (barely begun) job.  Patches accepted :)

  Ralph Corderoy wrote: 
Hi,

  It's a long way towards it:

    # AT&T.                      # Intel.
            .text                        .text
            .align  16                   .align  16
            .globl  main                 .globl  main
                                         .type   main, @function
    main:                        main:
            subl $12, %esp               sub esp, 12
            fnstcw 10(%esp)              fnstcw word ptr [esp + 10]
            movb $2, 11(%esp)            mov byte ptr [esp + 11], 2
            fldcw 10(%esp)               fldcw word ptr [esp + 10]
            movl 20(%esp), %eax          mov eax, dword ptr [esp + 20]
            movl 4(%eax), %eax           mov eax, dword ptr [eax + 4]
    
Whoops.  I've provided my post-processed version of lli's Intel output
which, since I removed the `%' and lowered the `DWORD PTR' isn't a good
example.  Still, you get the gist;  there are already significant
differences between the two.

Cheers,


Ralph.


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