What is 'mov (%r11,%rax,1),%dl'?

Mikhail Maltsev maltsevm@gmail.com
Sat Jan 2 15:37:00 GMT 2016


On 01/02/2016 06:01 PM, Jeffrey Walton wrote:
> I'm examining a crash on Cygwin-x64 (2.3.1) with GCC 5.2 (5.2.0). The
> crash is on a move instruction I am not familiar with. The instruction
> is ' mov (%r11,%rax,1),%dl'.
> 
> Can anyone explain the instruction to me?
IIUC, this is

mov dl, BYTE PTR [r11+rax]

in Intel syntax
(https://sourceware.org/binutils/docs/as/i386_002dMemory.html#i386_002dMemory).

-- 
Regards,
    Mikhail Maltsev



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