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Teach SimplifyCFG how to simplify indirectbr instructions.

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- Eliminate redundant successors.
 - Convert an indirectbr with one successor into a direct branch.

Also, generalize SimplifyCFG to be able to be run on a function entry block.
It knows quite a few simplifications which are applicable to the entry
block, and it only needs a few checks to avoid trouble with the entry block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111060 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-08-14 00:29:42 +00:00
parent 3d72367d30
commit e2c6d131d1
6 changed files with 96 additions and 19 deletions
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2
include/llvm/Transforms/Utils/Local.h
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@@ -118,8 +118,6 @@ bool EliminateDuplicatePHINodes(BasicBlock *BB);
/// of the CFG. It returns true if a modification was made, possibly deleting
/// the basic block that was pointed to.
///
/// WARNING: The entry node of a method may not be simplified.
///
bool SimplifyCFG(BasicBlock *BB, const TargetData *TD = 0);
/// FoldBranchToCommonDest - If this basic block is ONLY a setcc and a branch,