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From: PredatorZeta
Subject: Bug fixes (was: "Recursion, need more stack space.")

Peter Gerwinski <peter@agnes.dida.physik.uni-essen.de> wrote:

> Or else: Loading the memory reference into a register and
> pushing that *might* be faster than a direct push (don't know).

Just little clarifying.....:))
No. Surely not on 80x86 machines. Look this (is for Pentium):

1      push (mem)            take 2 cycles NOT pairable 

2   a) mov (mem), reg     take 1 cycle pairable 
                                     AGI Stall (1 cycle+cut off pairing
system)
     b) push reg               take 1 cycle pairable

      TOTAL:                    3 cycles

Well, is 2 (not pairable) versus 2 1/2 (not pairable) cycles.....
However, with a manual re-ordering it could take only 1 cycle...8-))

Hope this clarify......

Cya
PrZ.

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