[llvm-commits] patch: Lower glibc's x86 bswap_32() inline asm

[Chris Lattner]

On May 27, 2009, at 11:52 AM, Dale Johannesen wrote:

>> If llvm-gcc is telling GLIBC that the target is < i486, it would seem
>> to be a better approach would be to configure llvm-gcc to not do  
>> that.
>>
>> Offhand I don't know the specific configure options to recommend, but
>> it seems to be some combination of --with-arch= and --with-target=
>> possibly along with --with-tune=generic. If someone can figure out
>> specific values to recommend, we can put them in README.LLVM.
>
> There are values recommended there, but only for Darwin.  I think the
> with-arch and with-tune values should be generally applicable, though.

I think it is best to recommend -march=pentium4 at the very least, to  
get SSE2 support.

-Chris