From 51a4ad475b095aed49caff176b98c0754e421af4 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 6 Mar 2005 20:55:34 +0000
Subject: [PATCH] new helper method
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20491 91177308-0d34-0410-b5e6-96231b3b80d8
---
include/llvm/Analysis/LoopInfo.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/llvm/Analysis/LoopInfo.h b/include/llvm/Analysis/LoopInfo.h
index 0be3ddb3a0e..402897c1fd9 100644
--- a/include/llvm/Analysis/LoopInfo.h
+++ b/include/llvm/Analysis/LoopInfo.h
@@ -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.