diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2010-05-24 21:33:37 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-05-24 21:33:37 +0000 |
| commit | 3946043a80a043b3cf43b34bf068feaadc46485b (patch) | |
| tree | 221c20a608f7c7306aa8cfd26855c9d98b1b7d0f /lib/CodeGen/MachineFunction.cpp | |
| parent | e350690e3b0b33255ad9b8f152da4dff43014f9b (diff) | |
| download | llvm-3946043a80a043b3cf43b34bf068feaadc46485b.tar.gz llvm-3946043a80a043b3cf43b34bf068feaadc46485b.tar.bz2 llvm-3946043a80a043b3cf43b34bf068feaadc46485b.tar.xz | |
Avoid adding duplicate function live-in's.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104560 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineFunction.cpp')
| -rw-r--r-- | lib/CodeGen/MachineFunction.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp index 3cf10b3ac6..a38c881982 100644 --- a/lib/CodeGen/MachineFunction.cpp +++ b/lib/CodeGen/MachineFunction.cpp @@ -398,8 +398,14 @@ void MachineFunction::viewCFGOnly() const unsigned MachineFunction::addLiveIn(unsigned PReg, const TargetRegisterClass *RC) { assert(RC->contains(PReg) && "Not the correct regclass!"); - unsigned VReg = getRegInfo().createVirtualRegister(RC); - getRegInfo().addLiveIn(PReg, VReg); + MachineRegisterInfo &MRI = getRegInfo(); + unsigned VReg = MRI.getLiveInVirtReg(PReg); + if (VReg) { + assert(MRI.getRegClass(VReg) == RC && "Register class mismatch!"); + return VReg; + } + VReg = MRI.createVirtualRegister(RC); + MRI.addLiveIn(PReg, VReg); return VReg; } |