diff options
Diffstat (limited to 'lib/CodeGen/LiveIntervalAnalysis.cpp')
| -rw-r--r-- | lib/CodeGen/LiveIntervalAnalysis.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index cacbd0a61b..3d95827226 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -304,8 +304,15 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb, // Make sure the first definition is not a partial redefinition. Add an // <imp-def> of the full register. - if (MO.getSubReg()) + if (MO.getSubReg()) { mi->addRegisterDefined(interval.reg); + // Mark all defs of interval.reg on this instruction as reading <undef>. + for (unsigned i = MOIdx, e = mi->getNumOperands(); i != e; ++i) { + MachineOperand &MO2 = mi->getOperand(i); + if (MO2.isReg() && MO2.getReg() == interval.reg && MO2.getSubReg()) + MO2.setIsUndef(); + } + } MachineInstr *CopyMI = NULL; if (mi->isCopyLike()) { |