Le Sun, 5 Mar 2006 00:25:03 +1000, dans son message intitulé Re:
[e-devel] [patch] edje jittery with sse, "Imran Syed"
<[EMAIL PROTECTED]> a eu le courage de nous raconter :
> Hello ilLogict,
>
> I can't replicate what you have shown (atleast without your exact
> compile strings)
>
> $ cat floaty.c
> #include <stdio.h>
> int main( void )
> {
> double c0=.6;
> double k1;
> int t0,t1;
> int i=1,j=6;
>
> t0=(1.0-c0)*i+c0*j;
> k1=(1.0-c0)*i+c0*j;
> t1=k1;
> printf("t0=%d\n",t0);
> printf("k1=%e\n",k1);
> printf("t1=%d\n",t1);
> c0=k1-4;
> printf("k1-4=%e\n",c0);
>
> return 0;
> }
> $ gcc -march=athlon-xp -mfpmath=sse floaty.c -o floaty
> $ ./floaty
> t0=3
> k1=4.000000e+00
> t1=4
> k1-4=0.000000e+00
> $ gcc -march=athlon-xp -mfpmath=387 floaty.c -o floaty
> $ ./floaty
> t0=3
> k1=4.000000e+00
> t1=4
> k1-4=0.000000e+00
>
> I think the athlon-xp sse doesn't have support for double and it is
> probably using 387 here. Do you happen to have a P4 or newer AMD chip
> with sse2? Also, with regards to 80bits in 387 and 64 in sse, you
> want to look at -ffloat-store. Last time I checked, it was supposed
> to help in these kind of situations.
>
> Regards,
> Imran
Hello!
Yes, I have an Athlon64, so with sse2. -ffloat-store doesn't help
(tested), as it is used to make calculations with 64bits instead of 80
when using 387, no?
Cheers!
ilLogict
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