diff options
| -rw-r--r-- | lib/CodeGen/LiveInterval.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp index 3c18017f3f..16551ab5d0 100644 --- a/lib/CodeGen/LiveInterval.cpp +++ b/lib/CodeGen/LiveInterval.cpp @@ -769,6 +769,14 @@ unsigned ConnectedVNInfoEqClasses::Classify(const LiveInterval *LI) { // operand constraint? if (const VNInfo *UVNI = LI->getVNInfoAt(VNI->def.getUseIndex())) Connect(VNI->id, UVNI->id); + + // Check for a tied operand constraint involving an early clobber def, + // where one VN ends right before the use index and the next VN is defined + // at the same use index. + if (VNI->def.isUse()) { + if (const VNInfo *PVNI = LI->getVNInfoAt(VNI->def.getLoadIndex())) + Connect(PVNI->id, VNI->id); + } } } |