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- add performance numbers for all variations of blur on my home machine

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Bryce Denney 2002-04-16 18:16:58 +00:00
parent 90af02f43a
commit 45a03bf2d5
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bochs-performance/testcases/README
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@ -87,6 +87,20 @@ With 8 case switch, 2.241196 ms. (jump table)
With 16 case switch, 3.122807 ms. (jump table) With 16 case switch, 3.122807 ms. (jump table)
With 32 case switch, 3.080882 ms. (jump table) With 32 case switch, 3.080882 ms. (jump table)
Once you have enough cases that gcc creates a jump table, the
cost of a switch statement is about 7 instructions.
Try with a bunch of function calls in a switch stmt.
blur-O2 1.798693 ms
blur-O2-func 3.309882 ms
blur-O2-switch 3.101132 ms
blur-O2-switch-call 2.667050 ms
blur-O2-fnptr-switch 8.669802 ms
blur-O2-fnptr-table 6.010503 ms
;;;;;;;;;;;blur.c revision 1.2, compiled with -O2 -S;;;;;;;;;;;; ;;;;;;;;;;;blur.c revision 1.2, compiled with -O2 -S;;;;;;;;;;;;
;; with some annotations by Bryce to figure out what is what. ;; with some annotations by Bryce to figure out what is what.