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Author SHA1 Message Date
Manman Ren 4ece7452ba PGO branch weight: update edge weights in SelectionDAGBuilder. 
When converting from "or + br" to two branches, or converting from
"and + br" to two branches, we correctly update the edge weights of
the two branches.

The previous attempt at r200431 was reverted at r200434 because of
two testing case failures. I modified my patch a little, but forgot
to re-run "make check-all".

Testing case CodeGen/ARM/lsr-unfolded-offset.ll is updated because of
the patch's impact on branch probability which causes changes in
spill placement.

llvm-svn: 200502
 2014-01-31 00:42:44 +00:00
Manman Ren 7407e0e31c Revert r200431 due to bot failures. 
llvm-svn: 200434
 2014-01-30 00:53:27 +00:00
Manman Ren 104e0c80cc PGO branch weight: update edge weights in SelectionDAGBuilder. 
When converting from "or + br" to two branches, or converting from
"and + br" to two branches, we correctly update the edge weights of
the two branches.

llvm-svn: 200431
 2014-01-30 00:24:37 +00:00