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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