diff options
| -rw-r--r-- | lib/CodeGen/RegAllocLinearScan.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp index c0720fe9d1..ac5143b7c6 100644 --- a/lib/CodeGen/RegAllocLinearScan.cpp +++ b/lib/CodeGen/RegAllocLinearScan.cpp @@ -466,6 +466,10 @@ unsigned RALinScan::attemptTrivialCoalescing(LiveInterval &cur, unsigned Reg) { CandReg = CopyMI->getOperand(0).getReg(); else return Reg; + + // If the target of the copy is a sub-register then don't coalesce. + if(CopyMI->getOperand(0).getSubReg()) + return Reg; } if (TargetRegisterInfo::isVirtualRegister(CandReg)) { |