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[smlnj] Diff of /sml/branches/primop-branch-3/NOTES/HISTORY
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Diff of /sml/branches/primop-branch-3/NOTES/HISTORY

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revision 1170, Fri Mar 22 19:58:50 2002 UTC revision 1171, Fri Mar 22 20:41:43 2002 UTC
# Line 15  Line 15 
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16  Name: Lal George  Name: Lal George
17  Date: 2002/03/22 14:18:25 EST  Date: 2002/03/22 14:18:25 EST
18  Tag: blume-20020321-cps-branch-prob  Tag: george-20020322-cps-branch-prob
19  Description:  Description:
20    
21  Implemented the Ball-Larus branch prediction-heuristic, and  Implemented the Ball-Larus branch prediction-heuristics, and
22  incorporated graphical viewers for control flow graphs.  incorporated graphical viewers for control flow graphs.
23    
24  Ball-Larus Heuristic:  Ball-Larus Heuristics:
25  ---------------------  ---------------------
26  See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.  See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
27    
# Line 33  Line 33 
33  the ball-larus heuristics predicts that the n=0 is unlikely  the ball-larus heuristics predicts that the n=0 is unlikely
34  (OH-heuristic), and the 'then' branch is unlikely because of the  (OH-heuristic), and the 'then' branch is unlikely because of the
35  RH-heuristic -- giving the 'then' branch an even lower combined  RH-heuristic -- giving the 'then' branch an even lower combined
36  probability using the Dempster-Shater theory.  probability using the Dempster-Shafer theory.
37    
38  Finally, John Reppy's loop analysis in MLRISC, further lowers the  Finally, John Reppy's loop analysis in MLRISC, further lowers the
39  probability of the 'then' branch because of the loop in the else  probability of the 'then' branch because of the loop in the else

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