diff options
Diffstat (limited to 'lib/CodeGen/RegisterCoalescer.cpp')
| -rw-r--r-- | lib/CodeGen/RegisterCoalescer.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp index 7592074478..ac0ed5f611 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -430,7 +430,8 @@ bool RegisterCoalescer::adjustCopiesBackFrom(const CoalescerPair &CP, // If AValNo is defined as a copy from IntB, we can potentially process this. // Get the instruction that defines this value number. MachineInstr *ACopyMI = LIS->getInstructionFromIndex(AValNo->def); - if (!CP.isCoalescable(ACopyMI)) + // Don't allow any partial copies, even if isCoalescable() allows them. + if (!CP.isCoalescable(ACopyMI) || !ACopyMI->isFullCopy()) return false; // Get the LiveRange in IntB that this value number starts with. |