[llvm-commits] CVS: llvm/lib/VMCore/BasicBlock.cpp
Chris Lattner
lattner at cs.uiuc.edu
Wed Feb 23 18:37:40 PST 2005
Changes in directory llvm/lib/VMCore:
BasicBlock.cpp updated: 1.56 -> 1.57
---
Log message:
add a new method.
---
Diffs of the changes: (+10 -0)
BasicBlock.cpp | 10 ++++++++++
1 files changed, 10 insertions(+)
Index: llvm/lib/VMCore/BasicBlock.cpp
diff -u llvm/lib/VMCore/BasicBlock.cpp:1.56 llvm/lib/VMCore/BasicBlock.cpp:1.57
--- llvm/lib/VMCore/BasicBlock.cpp:1.56 Wed Feb 23 10:53:04 2005
+++ llvm/lib/VMCore/BasicBlock.cpp Wed Feb 23 20:37:26 2005
@@ -129,6 +129,16 @@
I->dropAllReferences();
}
+/// getSinglePredecessor - If this basic block has a single predecessor block,
+/// return the block, otherwise return a null pointer.
+BasicBlock *BasicBlock::getSinglePredecessor() {
+ pred_iterator PI = pred_begin(this), E = pred_end(this);
+ if (PI == E) return 0; // No preds.
+ BasicBlock *ThePred = *PI;
+ ++PI;
+ return (PI == E) ? ThePred : 0 /*multiple preds*/;
+}
+
// removePredecessor - This method is used to notify a BasicBlock that the
// specified Predecessor of the block is no longer able to reach it. This is
// actually not used to update the Predecessor list, but is actually used to
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