diff options
Diffstat (limited to 'lib/Transforms/Scalar')
| -rw-r--r-- | lib/Transforms/Scalar/LoopRotation.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/LoopRotation.cpp b/lib/Transforms/Scalar/LoopRotation.cpp index 1118ed5..aed84e2 100644 --- a/lib/Transforms/Scalar/LoopRotation.cpp +++ b/lib/Transforms/Scalar/LoopRotation.cpp @@ -12,7 +12,6 @@ //===----------------------------------------------------------------------===// #define DEBUG_TYPE "loop-rotate" - #include "llvm/Transforms/Scalar.h" #include "llvm/Function.h" #include "llvm/Instructions.h" @@ -26,7 +25,6 @@ #include "llvm/Support/Debug.h" #include "llvm/ADT/Statistic.h" #include "llvm/ADT/SmallVector.h" - using namespace llvm; #define MAX_HEADER_SIZE 16 @@ -178,6 +176,12 @@ bool LoopRotate::rotateLoop(Loop *Lp, LPPassManager &LPM) { assert(NewHeader && "Unable to determine new loop header"); assert(L->contains(NewHeader) && !L->contains(Exit) && "Unable to determine loop header and exit blocks"); + + // This code assumes that new header has exactly one predecessor. Remove any + // single entry PHI nodes in it. + assert(NewHeader->getSinglePredecessor() && + "New header doesn't have one pred!"); + FoldSingleEntryPHINodes(NewHeader); // Copy PHI nodes and other instructions from original header // into original pre-header. Unlike original header, original pre-header is |