[llvm-commits] CVS: llvm/lib/Transforms/Scalar/LoopPreheaders.cpp
Chris Lattner
lattner at cs.uiuc.edu
Mon Aug 18 17:55:02 PDT 2003
Changes in directory llvm/lib/Transforms/Scalar:
LoopPreheaders.cpp updated: 1.13 -> 1.14
---
Log message:
Fix grammar, add comment
---
Diffs of the changes:
Index: llvm/lib/Transforms/Scalar/LoopPreheaders.cpp
diff -u llvm/lib/Transforms/Scalar/LoopPreheaders.cpp:1.13 llvm/lib/Transforms/Scalar/LoopPreheaders.cpp:1.14
--- llvm/lib/Transforms/Scalar/LoopPreheaders.cpp:1.13 Mon Aug 18 09:33:38 2003
+++ llvm/lib/Transforms/Scalar/LoopPreheaders.cpp Mon Aug 18 17:54:06 2003
@@ -10,7 +10,7 @@
// Loop exit-block insertion guarantees that all exit blocks from the loop
// (blocks which are outside of the loop that have predecessors inside of the
// loop) are dominated by the loop header. This simplifies transformations such
-// as store-sinking that is built into LICM.
+// as store-sinking that are built into LICM.
//
// Note that the simplifycfg pass will clean up blocks which are split out but
// end up being unnecessary, so usage of this pass does not neccesarily
@@ -91,6 +91,9 @@
Changed = true;
}
+ // Regardless of whether or not we added a preheader to the loop we must
+ // guarantee that the preheader dominates all exit nodes. If there are any
+ // exit nodes not dominated, split them now.
DominatorSet &DS = getAnalysis<DominatorSet>();
BasicBlock *Header = L->getHeader();
for (unsigned i = 0, e = L->getExitBlocks().size(); i != e; ++i)
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