diff options
Diffstat (limited to 'llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp b/llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp index ec6bf18b2769..252910fd9462 100644 --- a/llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp +++ b/llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp @@ -24,10 +24,7 @@ #include "llvm/ADT/Statistic.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunctionPass.h" -#include "llvm/CodeGen/MachineRegisterInfo.h" -#include "llvm/CodeGen/Passes.h" #include "llvm/CodeGen/StackMaps.h" -#include "llvm/CodeGen/TargetFrameLowering.h" #include "llvm/CodeGen/TargetInstrInfo.h" #include "llvm/IR/Statepoint.h" #include "llvm/InitializePasses.h" @@ -156,12 +153,17 @@ static Register performCopyPropagation(Register Reg, RI = ++MachineBasicBlock::iterator(Def); IsKill = DestSrc->Source->isKill(); - // There are no uses of original register between COPY and STATEPOINT. - // There can't be any after STATEPOINT, so we can eliminate Def. if (!Use) { + // There are no uses of original register between COPY and STATEPOINT. + // There can't be any after STATEPOINT, so we can eliminate Def. LLVM_DEBUG(dbgs() << "spillRegisters: removing dead copy " << *Def); Def->eraseFromParent(); + } else if (IsKill) { + // COPY will remain in place, spill will be inserted *after* it, so it is + // not a kill of source anymore. + const_cast<MachineOperand *>(DestSrc->Source)->setIsKill(false); } + return SrcReg; } |