commit d6908dc4a23cbaf8c9bde979d08fbb7291e7652f
author Evan Cheng <evan.cheng@apple.com> Mon May 10 21:25:30 2010 +0000
committer Evan Cheng <evan.cheng@apple.com> Mon May 10 21:25:30 2010 +0000
tree 8e28d12edb0900d92f80c21f9b8f688fdcbe39ac
parent 9d55b234254f46fc43ea23ff7fa8b1f7fb89150c

It's not safe to propagate implicit_def that defines part of a register.

llvm-svn: 103436

llvm/lib/CodeGen/ProcessImplicitDefs.cpp

diff --git a/llvm/lib/CodeGen/ProcessImplicitDefs.cpp b/llvm/lib/CodeGen/ProcessImplicitDefs.cpp
index d7179b3..75875d2 100644
--- a/llvm/lib/CodeGen/ProcessImplicitDefs.cpp
+++ b/llvm/lib/CodeGen/ProcessImplicitDefs.cpp
@@ -89,6 +89,8 @@
       MachineInstr *MI = &*I;
       ++I;
       if (MI->isImplicitDef()) {
+        if (MI->getOperand(0).getSubReg())
+          continue;
         unsigned Reg = MI->getOperand(0).getReg();
         ImpDefRegs.insert(Reg);
         if (TargetRegisterInfo::isPhysicalRegister(Reg)) {