[fpc-devel] Extended type

[Florian Klaempfl]

Am 19.04.2011 15:18, schrieb Marco van de Voort:
> In our previous episode, Dani?l Mantione said:
>>
>> By the way, recent GCC versions calculate the goniometric functions in
>> software using SSE3, and I checked that this is indeed slightly faster
>> than the x87. So we can get rid to the x87 stuff, should we want.
>
> You'll need to runtime test for SSE3 though. Since the first generation of
> athlon64's (clawhammer and friends, socket 751 or so) doesn't have SSE3.

For such a relatively expensive operations, one runtime check per 
function is imo ok even more since it is predicted perfectly after the 
first run.

>
> I checked and 64-bit Pentium-D's do have SSE3, at least mine does:
>
> CPU:
> Intel(R) Pentium(R) D CPU 2.80GHz (2793.02-MHz K8-class CPU)
>    Origin = "GenuineIntel"  Id = 0xf47  Family = f  Model = 4  Stepping = 7
>
> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>    Features2=0x641d<SSE3,DTES64,MON,DS_CPL,CNXT-ID,CX16,xTPR>
>    AMD Features=0x20100800<SYSCALL,NX,LM>
>    AMD Features2=0x1<LAHF>
>    TSC: P-state invariant
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