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Author SHA1 Message Date
Dan Gohman 5ab9c0a927 Fix SpeculativelyExecuteBB to either speculate all or none of the phis 
present in the bottom of the CFG triangle, as the transformation isn't
ever valuable if the branch can't be eliminated.

Also, unify some heuristics between SimplifyCFG's multiple
if-converters, for consistency.

This fixes rdar://10627242.

llvm-svn: 147630
 2012-01-05 23:58:56 +00:00
Frits van Bommel 8ae07996c9 Teach SimplifyCFG that (switch (select cond, X, Y)) is better expressed as a branch. 
Based on a patch by Alistair Lynn.

llvm-svn: 126647
 2011-02-28 09:44:07 +00:00