diff options
Diffstat (limited to 'lib/CodeGen/RenameIndependentSubregs.cpp')
| -rw-r--r-- | lib/CodeGen/RenameIndependentSubregs.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/CodeGen/RenameIndependentSubregs.cpp b/lib/CodeGen/RenameIndependentSubregs.cpp index d2eff950d861a..bd5ecbd28f293 100644 --- a/lib/CodeGen/RenameIndependentSubregs.cpp +++ b/lib/CodeGen/RenameIndependentSubregs.cpp @@ -243,10 +243,14 @@ void RenameIndependentSubregs::rewriteOperands(const IntEqClasses &Classes, unsigned VReg = Intervals[ID]->reg; MO.setReg(VReg); - if (MO.isTied()) { + + if (MO.isTied() && Reg != VReg) { /// Undef use operands are not tracked in the equivalence class but need /// to be update if they are tied. MO.getParent()->substituteRegister(Reg, VReg, 0, TRI); + + // substituteRegister breaks the iterator, so restart. + I = MRI->reg_nodbg_begin(Reg); } } // TODO: We could attempt to recompute new register classes while visiting |