diff options
Diffstat (limited to 'llvm/lib/CodeGen/PeepholeOptimizer.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/PeepholeOptimizer.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/PeepholeOptimizer.cpp b/llvm/lib/CodeGen/PeepholeOptimizer.cpp index e613d074bfc..6818195d8bb 100644 --- a/llvm/lib/CodeGen/PeepholeOptimizer.cpp +++ b/llvm/lib/CodeGen/PeepholeOptimizer.cpp @@ -1853,6 +1853,11 @@ ValueTrackerResult ValueTracker::getNextSourceFromBitcast() { SrcIdx = OpIdx; } + // In some rare case, Def has no input, SrcIdx is out of bound, + // getOperand(SrcIdx) will fail below. + if (SrcIdx >= Def->getNumOperands()) + return ValueTrackerResult(); + // Stop when any user of the bitcast is a SUBREG_TO_REG, replacing with a COPY // will break the assumed guarantees for the upper bits. for (const MachineInstr &UseMI : MRI.use_nodbg_instructions(DefOp.getReg())) { |
