diff options
Diffstat (limited to 'llvm/lib/CodeGen/RegAllocFast.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/RegAllocFast.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/RegAllocFast.cpp b/llvm/lib/CodeGen/RegAllocFast.cpp index d18ecf91ea4..83b59bae838 100644 --- a/llvm/lib/CodeGen/RegAllocFast.cpp +++ b/llvm/lib/CodeGen/RegAllocFast.cpp @@ -349,6 +349,11 @@ void RAFast::usePhysReg(MachineOperand &MO) { unsigned PhysReg = MO.getReg(); assert(TargetRegisterInfo::isPhysicalRegister(PhysReg) && "Bad usePhysReg operand"); + + // Ignore undef uses. + if (MO.isUndef()) + return; + markRegUsedInInstr(PhysReg); switch (PhysRegState[PhysReg]) { case regDisabled: |
