diff options
| -rw-r--r-- | lib/CodeGen/RegisterCoalescer.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp index cc9ec3c..c7be0b3 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -1414,8 +1414,12 @@ bool RegisterCoalescer::JoinIntervals(CoalescerPair &CP) { // Deny any overlapping intervals. This depends on all the reserved // register live ranges to look like dead defs. for (const unsigned *AS = TRI->getOverlaps(CP.getDstReg()); *AS; ++AS) { - if (!LIS->hasInterval(*AS)) + if (!LIS->hasInterval(*AS)) { + // Make sure at least DstReg itself exists before attempting a join. + if (*AS == CP.getDstReg()) + LIS->getOrCreateInterval(CP.getDstReg()); continue; + } if (RHS.overlaps(LIS->getInterval(*AS))) { DEBUG(dbgs() << "\t\tInterference: " << PrintReg(*AS, TRI) << '\n'); return false; |