Re: Devs and rice flags (Was: Re: [gentoo-user] emerge -j, make -j and make -l )

[Michael Mol]

On Mon, Nov 28, 2011 at 2:36 PM, Pandu Poluan <pandu@××××××.info> wrote:
> On Nov 29, 2011 2:02 AM, "Florian Philipp" <lists@×××××××××××.net> wrote:
>> Am 28.11.2011 18:56, schrieb Michael Mol:
>> > On Mon, Nov 28, 2011 at 11:46 AM, Pandu Poluan <pandu@××××××.info>
>> > wrote:
>> >> On Nov 28, 2011 10:38 PM, "Michael Mol" <mikemol@×××××.com> wrote:
>> >>> On Sun, Nov 27, 2011 at 7:54 PM, Pandu Poluan <pandu@××××××.info>
>> >>> wrote:
>> >>>> Won't file a bug report, though. I have a feeling that my bug report
>> >>>> re:
>> >>>> emerge failure will be marked WONTFIX thanks to the 'ricer special'
>> >>>> CFLAGS
>> >>>
>> >>> The CFLAGS you showed me weren't any more ricer than "-O2
>> >>> -march=native". (I didn't know that -D_FORTIFY=2 came from gcc)
>> >>>
>> >>> They wouldn't have a leg to stand on...
>> >>>
>> >>
>> >> Mine is:
>> >>
>> >> CFLAGS="-O2 -march=native -fomit-frame-pointer -floop-interchange
>> >> -floop-strip-mine -floop-block -funsafe-math-optimizations
>> >> -fexcess-precision=fast"
>> >>
>> >> If you tell me that's not a ricer's CFLAGS, then you've just made me a
>> >> very
>> >> happy cat :-)
>> >
>> > No, you've got some ugly flags in there. -fexcess-precision and
>> > -funsafe-math-optimizations, in particular. (I must have been talking
>> > to someone else last week; sorry, I'm terrible with names.)
>> >
>>
>> I doubt -fexcess-precision=fast does anything at all. Pandu uses an
>> AMD64 system, right? Then you have -mfpmath=sse set per default and SSE
>> does not have excess precision issues (that's just for the old x87 FPU).
>
> I use Intel boxes, unfortunately.

Are you using a 64-bit x86-derived system? Same difference in this
context. AMD hit the market with a good 64-bit x86-based ISA first,
and devs started calling it AMD64 then. That's mostly stuck even after
Intel released a mostly-compatible competitor, EM64T.

-- 
:wq