llvm dev - Feb 2010 - [LLVMdev] FD_ZERO unsupported inline asm on 64 bit

Thanks Duncan, 

It seems the bug has been reopened. After reading the comments related to the
bug report, it was not clear if this is fixed in llvm-gcc, or just in clang.

Thanks, 
Cristi

On Feb 16, 2010, at 3:44 PM, Duncan Sands wrote:
> Hi Cristian, this is (part of) bug 3373, see
>  http://llvm.org/bugs/show_bug.cgi?id=3373
> 
>> 	FD_ZERO(&rfds);   //this is the error line
> 
> ...
> 
>> # define __FD_ZERO(fdsp) \
>>  do {                                                                  
\
>>    int __d0, __d1;                                                     
\
>>    __asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS         
\
>>                          : "=c" (__d0), "=D" (__d1)
\
>>                          : "a" (0), "0" (sizeof
(fd_set)                     \
>>                                          / sizeof (__fd_mask)),        
\
>>                            "1" (&__FDS_BITS (fdsp)[0])   
\
>>                          : "memory");                        
\
>>  } while (0)
> 
> That said, this is an odd way to implement FD_ZERO.  The crazy asm is
equivalent
> to a simple memset...
> 
> Ciao,
> 
> Duncan.
> 
> PS: The underlying problem here is probably that __d0 and __d1 are declared
as
> int, which is only 32 bits in size, while the asm is expecting 64 bits.

Hi Cristi,
> It seems the bug has been reopened. After reading the comments related to
the bug report, it was not clear if this is fixed in llvm-gcc, or just in clang.
it has been fixed in clang but not in llvm-gcc.

Ciao,

Duncan.

> it has been fixed in clang but not in llvm-gcc.
I believe I fixed it in llvm-gcc via fixincludes :) Not the best way, but...

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University