August 10, 2007 Re: Biggest problems w/ D - 64bit | ||||
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renoX Wrote: > 2x? > Your code must do a lot of 64b computation! Yes. Lots of 64-bit integer shifts of pointer values. The only other difference is that 32-bit pointer addresses are closer together. The result: The exact same code compiled for 32- or 64-bit has a 2x speed difference. > > When the AMD64 was released benchmarks made showed at best a 20% improvement, which is quite a lot to get with a simple recompilation assuming the code is 64b clean of course but is nowhere 2x. Yes. 20% is a good rule of thumb. That's what we usually see, for general object-oriented programming. System-level programming is different. I'll try gdc someday.... |
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