Switch macro timings

[hutch--]

Each has its advantage, try a table based sequence of 10 1000 1000000 100000000 and you will see why a normal sequential comparison switch is more general purpose. Table based switch statements must work on stored addresses and with wide disparity of value that tables become massive.

[TWell]

Code Select Expand

AMD Athlon(tm) II X2 220 Processor 2.8 Ghz
Assembled with AsmC
Result MB:      0, 25 ms
Result Masm32:  0, 2708 ms
Result AsmC:    0, 18 ms

14084   bytes for swMB
27540   bytes for swMasm32
22111   bytes for swAsmC

[jj2007]

Nice "deep" article on switch: From Switch Statement Down to Machine Code by Vlad Lazarenko (credits to Frankie at Pelles C).

[hutch--]

 

Try a "switch" statement with a number range like "0, 2gig, 4gig" and see which algo is faster.  :P