diff options
| -rw-r--r-- | llvm/lib/CodeGen/PrologEpilogInserter.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp index a119b1c62eb..f61c0cb6da0 100644 --- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp +++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp @@ -654,9 +654,9 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) { DEBUG(dbgs() << "alloc FI(" << i << ") at SP[" << -Offset << "]\n"); MFI->setObjectOffset(i, -Offset); // Set the computed offset } - } else { - unsigned MaxCSFI = MaxCSFrameIndex, MinCSFI = MinCSFrameIndex; - for (unsigned i = MaxCSFI; i >= MinCSFI; --i) { + } else if (MaxCSFrameIndex >= MinCSFrameIndex) { + // Be careful about underflow in comparisons agains MinCSFrameIndex. + for (unsigned i = MaxCSFrameIndex; i != MinCSFrameIndex - 1; --i) { unsigned Align = MFI->getObjectAlignment(i); // Adjust to alignment boundary Offset = alignTo(Offset, Align, Skew); |
