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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
Benjamin Kramer ceb5daa567 Revert "SimplifyCFG: GEPs with just one non-constant index are also cheap." 
Yes, there are other types than i8* and GEPs on them can produce an add+multiply.
We don't consider that cheap enough to be speculatively executed.

llvm-svn: 126481
 2011-02-25 10:33:33 +00:00
Benjamin Kramer dfdca1a14d SimplifyCFG: GEPs with just one non-constant index are also cheap. 
llvm-svn: 126452
 2011-02-24 23:26:09 +00:00
Benjamin Kramer 27361a7124 SimplifyCFG: GEPs with constant indices are cheap enough to be executed unconditionally. 
llvm-svn: 126445
 2011-02-24 22:46:11 +00:00