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new helper method

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20491 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-03-06 20:55:34 +00:00
parent be876b6036
commit 51a4ad475b
1 changed files with 15 additions and 0 deletions
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15
include/llvm/Analysis/LoopInfo.h
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@ -175,6 +175,21 @@ public:
Blocks.push_back(BB);
}
/// moveToHeader - This method is used to move BB (which must be part of this
/// loop) to be the loop header of the loop (the block that dominates all
/// others).
void moveToHeader(BasicBlock *BB) {
if (Blocks[0] == BB) return;
for (unsigned i = 0; ; ++i) {
assert(i != Blocks.size() && "Loop does not contain BB!");
if (Blocks[i] == BB) {
Blocks[i] = Blocks[0];
Blocks[0] = BB;
return;
}
}
}
/// removeBlockFromLoop - This removes the specified basic block from the
/// current loop, updating the Blocks as appropriate. This does not update
/// the mapping in the LoopInfo class.