diff options
| -rw-r--r-- | lib/CodeGen/RegisterCoalescer.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp index eb4ffe17a1..f45072f1ac 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -1732,6 +1732,12 @@ void JoinVals::pruneValues(JoinVals &Other, case CR_Replace: // This value takes precedence over the value in Other.LI. LIS->pruneValue(&Other.LI, Def, &EndPoints); + // Remove <def,read-undef> flags. This def is now a partial redef. + if (!Def.isBlock()) + for (MIOperands MO(Indexes->getInstructionFromIndex(Def)); + MO.isValid(); ++MO) + if (MO->isReg() && MO->isDef() && MO->getReg() == LI.reg) + MO->setIsUndef(false); DEBUG(dbgs() << "\t\tpruned " << PrintReg(Other.LI.reg) << " at " << Def << ": " << Other.LI << '\n'); break; |