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Author SHA1 Message Date
Manman Ren d81b8e88e3 PGO: preserve branch-weight metadata when merging two switches where 
the default target of the first switch is not the basic block the second switch
is in (PredDefault != BB).

llvm-svn: 163916
 2012-09-14 17:29:56 +00:00
Manman Ren 571d9e4b80 SimplifyCFG: preserve branch-weight metadata when creating a new switch from 
a pair of switch/branch where both depend on the value of the same variable and
the default case of the first switch/branch goes to the second switch/branch.

Code clean up and fixed a few issues:
1> handling the case where some cases of the 2nd switch are invalidated
2> correctly calculate the weight for the 2nd switch when it is a conditional eq

Testing case is modified from Alastair's original patch.

llvm-svn: 163635
 2012-09-11 17:43:35 +00:00