diff options
Diffstat (limited to 'contrib/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp')
| -rw-r--r-- | contrib/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/contrib/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp b/contrib/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp index ab2382e..4ce86f2 100644 --- a/contrib/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp +++ b/contrib/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp @@ -12,11 +12,11 @@ // //===----------------------------------------------------------------------===// -#include "llvm/CodeGen/Passes.h" #include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineInstr.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/CodeGen/Passes.h" #include "llvm/Support/Debug.h" #include "llvm/Support/raw_ostream.h" #include "llvm/Target/TargetInstrInfo.h" @@ -58,7 +58,7 @@ private: char ExpandPostRA::ID = 0; char &llvm::ExpandPostRAPseudosID = ExpandPostRA::ID; -INITIALIZE_PASS(ExpandPostRA, "postrapseudos", +INITIALIZE_PASS(ExpandPostRA, DEBUG_TYPE, "Post-RA pseudo instruction expansion pass", false, false) /// TransferImplicitOperands - MI is a pseudo-instruction, and the lowered @@ -142,8 +142,9 @@ bool ExpandPostRA::LowerCopy(MachineInstr *MI) { MachineOperand &DstMO = MI->getOperand(0); MachineOperand &SrcMO = MI->getOperand(1); - if (SrcMO.getReg() == DstMO.getReg()) { - DEBUG(dbgs() << "identity copy: " << *MI); + bool IdentityCopy = (SrcMO.getReg() == DstMO.getReg()); + if (IdentityCopy || SrcMO.isUndef()) { + DEBUG(dbgs() << (IdentityCopy ? "identity copy: " : "undef copy: ") << *MI); // No need to insert an identity copy instruction, but replace with a KILL // if liveness is changed. if (SrcMO.isUndef() || MI->getNumOperands() > 2) { |
