Re: [Tinycc-devel] Re: Please comment this patch, if you have the time.

[Zdenek Pavlas]

Rob Landley wrote:
> Let's see, according to http://sandpile.org/ia32 the opcode 0x85 is "TEST 
> Eb,Gb" and 0x0f is the prefix to indicate a two byte opcode follows.  At a 
> guess the function name indicates an x86 "test and jump".
>   

TCC outputs opcodes LSB first, so o(0x850f) is actually "db 0x0f, 0x85", 
which is "JNZ disp32".

> Except that the function _contents_ start by sticking 0x1a at the start of it, 
> which is "SBB Gb, Eb" and I have no _IDEA_ what that means, but google 
> probably will...  http://en.wikipedia.org/wiki/X86_assembly_language
> says "subtraction with borrow".  Ok...
>   
0x1a is probably the ARM's version of x86's JNZ...

--
Zdenek Pavlas