diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/MachineBasicBlock.cpp | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/llvm/lib/CodeGen/MachineBasicBlock.cpp b/llvm/lib/CodeGen/MachineBasicBlock.cpp index 0b9ee462d1a..03771bc5dae 100644 --- a/llvm/lib/CodeGen/MachineBasicBlock.cpp +++ b/llvm/lib/CodeGen/MachineBasicBlock.cpp @@ -1380,24 +1380,21 @@ MachineBasicBlock::computeRegisterLiveness(const TargetRegisterInfo *TRI, // Try searching forwards from Before, looking for reads or defs. const_iterator I(Before); - // If this is the last insn in the block, don't search forwards. - if (I != end()) { - for (++I; I != end() && N > 0; ++I) { - if (I->isDebugInstr()) - continue; + for (; I != end() && N > 0; ++I) { + if (I->isDebugInstr()) + continue; - --N; + --N; - MachineOperandIteratorBase::PhysRegInfo Info = - ConstMIOperands(*I).analyzePhysReg(Reg, TRI); + MachineOperandIteratorBase::PhysRegInfo Info = + ConstMIOperands(*I).analyzePhysReg(Reg, TRI); - // Register is live when we read it here. - if (Info.Read) - return LQR_Live; - // Register is dead if we can fully overwrite or clobber it here. - if (Info.FullyDefined || Info.Clobbered) - return LQR_Dead; - } + // Register is live when we read it here. + if (Info.Read) + return LQR_Live; + // Register is dead if we can fully overwrite or clobber it here. + if (Info.FullyDefined || Info.Clobbered) + return LQR_Dead; } // If we reached the end, it is safe to clobber Reg at the end of a block of |
