Skip Montanaro <skip at pobox.com>: > When I looked at this a long time ago it I seem to recall that roughly 60% > of the opcodes executed did nothing more than copy values to or from the > stack (of course, pushes and pops are some of the more efficient opcodes in > the instruction set). A three-address machine model would reduce this data > movement substantially. But it would only be worth doing if the cost of these data movements is a substantial fraction of the whole execution time. Does anyone have any timings to suggest that they are? Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg at cosc.canterbury.ac.nz +--------------------------------------+
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