diff options
Diffstat (limited to 'lib/CodeGen')
-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 f45072f1ac..ad1f5f4f12 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -1733,11 +1733,15 @@ void JoinVals::pruneValues(JoinVals &Other, // 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()) + if (!Def.isBlock()) { for (MIOperands MO(Indexes->getInstructionFromIndex(Def)); MO.isValid(); ++MO) if (MO->isReg() && MO->isDef() && MO->getReg() == LI.reg) MO->setIsUndef(false); + // This value will reach instructions below, but we need to make sure + // the live range also reaches the instruction at Def. + EndPoints.push_back(Def); + } DEBUG(dbgs() << "\t\tpruned " << PrintReg(Other.LI.reg) << " at " << Def << ": " << Other.LI << '\n'); break; |