On the 0x387 day of Apache Harmony Aleksey Shipilev wrote: > On 07 Nov 2007 00:27:25 +0300, Egor Pasko <[EMAIL PROTECTED]> wrote: > > Vladimir, guess what? :) I actually mixed several things > > altogether. > <giggly>(sigh) As usual, miracle does not happen :) I dreamed to see > software sqrt() implementation that could be faster than hardware one. > </giggly> > > > So, we are left with SSE asm that can be inlined by JIT and AFAI can > > see it is not as fast as HotSpot? Weird :) > No, for now we have just the intrinsic in native code, so we also have > overheads for JNI transition (and it is heavy!), parameter passing, > chains of calls, etc. I believe that sqrt() magic will lead that NBody > performance very close to RI.
Ha! I thought, you made it without JNI. Then we have a chance! If we do not get it through magics we still have another chance to implement 1/sqrt() :) > BTW, in my thought this benchmark is like the top of the iceberg > called "FP performance problems". Yes, I know, DRLVM has not been actively optimized for FP calc. -- Egor Pasko
