diff options
| -rw-r--r-- | lib/CodeGen/OptimizeExts.cpp | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/lib/CodeGen/OptimizeExts.cpp b/lib/CodeGen/OptimizeExts.cpp index acb6869..41fc204 100644 --- a/lib/CodeGen/OptimizeExts.cpp +++ b/lib/CodeGen/OptimizeExts.cpp @@ -73,6 +73,9 @@ FunctionPass *llvm::createOptimizeExtsPass() { return new OptimizeExts(); } /// the source, and if the source value is preserved as a sub-register of /// the result, then replace all reachable uses of the source with the subreg /// of the result. +/// Do not generate an EXTRACT that is used only in a debug use, as this +/// changes the code. Since this code does not currently share EXTRACTs, just +/// ignore all debug uses. bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB, SmallPtrSet<MachineInstr*, 8> &LocalMIs) { bool Changed = false; @@ -84,17 +87,17 @@ bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB, TargetRegisterInfo::isPhysicalRegister(SrcReg)) return false; - MachineRegisterInfo::use_iterator UI = MRI->use_begin(SrcReg); - if (++UI == MRI->use_end()) + MachineRegisterInfo::use_nodbg_iterator UI = MRI->use_nodbg_begin(SrcReg); + if (++UI == MRI->use_nodbg_end()) // No other uses. return false; // Ok, the source has other uses. See if we can replace the other uses // with use of the result of the extension. SmallPtrSet<MachineBasicBlock*, 4> ReachedBBs; - UI = MRI->use_begin(DstReg); - for (MachineRegisterInfo::use_iterator UE = MRI->use_end(); UI != UE; - ++UI) + UI = MRI->use_nodbg_begin(DstReg); + for (MachineRegisterInfo::use_nodbg_iterator UE = MRI->use_nodbg_end(); + UI != UE; ++UI) ReachedBBs.insert(UI->getParent()); bool ExtendLife = true; @@ -103,9 +106,9 @@ bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB, // Uses that the result of the instruction can reach. SmallVector<MachineOperand*, 8> ExtendedUses; - UI = MRI->use_begin(SrcReg); - for (MachineRegisterInfo::use_iterator UE = MRI->use_end(); UI != UE; - ++UI) { + UI = MRI->use_nodbg_begin(SrcReg); + for (MachineRegisterInfo::use_nodbg_iterator UE = MRI->use_nodbg_end(); + UI != UE; ++UI) { MachineOperand &UseMO = UI.getOperand(); MachineInstr *UseMI = &*UI; if (UseMI == MI) @@ -147,9 +150,9 @@ bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB, // Look for PHI uses of the extended result, we don't want to extend the // liveness of a PHI input. It breaks all kinds of assumptions down // stream. A PHI use is expected to be the kill of its source values. - UI = MRI->use_begin(DstReg); - for (MachineRegisterInfo::use_iterator UE = MRI->use_end(); UI != UE; - ++UI) + UI = MRI->use_nodbg_begin(DstReg); + for (MachineRegisterInfo::use_nodbg_iterator UE = MRI->use_nodbg_end(); + UI != UE; ++UI) if (UI->isPHI()) PHIBBs.insert(UI->getParent()); |