diff options
Diffstat (limited to 'llvm/lib/CodeGen/ReachingDefAnalysis.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/ReachingDefAnalysis.cpp | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/llvm/lib/CodeGen/ReachingDefAnalysis.cpp b/llvm/lib/CodeGen/ReachingDefAnalysis.cpp index a143869..6ca8d5f 100644 --- a/llvm/lib/CodeGen/ReachingDefAnalysis.cpp +++ b/llvm/lib/CodeGen/ReachingDefAnalysis.cpp @@ -65,8 +65,10 @@ void ReachingDefAnalysis::enterBasicBlock( // Treat function live-ins as if they were defined just before the first // instruction. Usually, function arguments are set up immediately // before the call. - LiveRegs[*Unit] = -1; - MBBReachingDefs[MBBNumber][*Unit].push_back(LiveRegs[*Unit]); + if (LiveRegs[*Unit] != -1) { + LiveRegs[*Unit] = -1; + MBBReachingDefs[MBBNumber][*Unit].push_back(-1); + } } } LLVM_DEBUG(dbgs() << printMBBReference(*MBB) << ": entry\n"); @@ -129,12 +131,14 @@ void ReachingDefAnalysis::processDefs(MachineInstr *MI) { continue; for (MCRegUnitIterator Unit(MO.getReg(), TRI); Unit.isValid(); ++Unit) { // This instruction explicitly defines the current reg unit. - LLVM_DEBUG(dbgs() << printReg(MO.getReg(), TRI) << ":\t" << CurInstr + LLVM_DEBUG(dbgs() << printReg(*Unit, TRI) << ":\t" << CurInstr << '\t' << *MI); // How many instructions since this reg unit was last written? - LiveRegs[*Unit] = CurInstr; - MBBReachingDefs[MBBNumber][*Unit].push_back(CurInstr); + if (LiveRegs[*Unit] != CurInstr) { + LiveRegs[*Unit] = CurInstr; + MBBReachingDefs[MBBNumber][*Unit].push_back(CurInstr); + } } } InstIds[MI] = CurInstr; |