diff options
Diffstat (limited to 'lib/CodeGen')
-rw-r--r-- | lib/CodeGen/MachineRegisterInfo.cpp | 2 | ||||
-rw-r--r-- | lib/CodeGen/RegisterScavenging.cpp | 5 |
2 files changed, 6 insertions, 1 deletions
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp index f140decd96..7ea151713a 100644 --- a/lib/CodeGen/MachineRegisterInfo.cpp +++ b/lib/CodeGen/MachineRegisterInfo.cpp @@ -18,7 +18,7 @@ using namespace llvm; MachineRegisterInfo::MachineRegisterInfo(const TargetRegisterInfo &TRI) - : TRI(&TRI), IsSSA(true) { + : TRI(&TRI), IsSSA(true), TracksLiveness(true) { VRegInfo.reserve(256); RegAllocHints.reserve(256); UsedPhysRegs.resize(TRI.getNumRegs()); diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp index 2818f490f6..03bd82e225 100644 --- a/lib/CodeGen/RegisterScavenging.cpp +++ b/lib/CodeGen/RegisterScavenging.cpp @@ -83,6 +83,11 @@ void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) { assert((NumPhysRegs == 0 || NumPhysRegs == TRI->getNumRegs()) && "Target changed?"); + // It is not possible to use the register scavenger after late optimization + // passes that don't preserve accurate liveness information. + assert(MRI->tracksLiveness() && + "Cannot use register scavenger with inaccurate liveness"); + // Self-initialize. if (!MBB) { NumPhysRegs = TRI->getNumRegs(); |