diff options
author | Evan Cheng <evan.cheng@apple.com> | 2007-11-05 03:11:55 +0000 |
---|---|---|
committer | Evan Cheng <evan.cheng@apple.com> | 2007-11-05 03:11:55 +0000 |
commit | 9cf8f9c2401675e1b097e8c0ec9132e739acca64 (patch) | |
tree | cfbfbf9937b877f96699ed7b4e807ee7439ae069 /lib/CodeGen/LiveVariables.cpp | |
parent | f481d5186285d21f233d481319d905ffb32dc713 (diff) | |
download | external_llvm-9cf8f9c2401675e1b097e8c0ec9132e739acca64.zip external_llvm-9cf8f9c2401675e1b097e8c0ec9132e739acca64.tar.gz external_llvm-9cf8f9c2401675e1b097e8c0ec9132e739acca64.tar.bz2 |
Handle cases where a register and one of its super-register are both marked as
defined on the same instruction. This fixes PR1767.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43699 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/LiveVariables.cpp')
-rw-r--r-- | lib/CodeGen/LiveVariables.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp index 57396b7..7e8965e 100644 --- a/lib/CodeGen/LiveVariables.cpp +++ b/lib/CodeGen/LiveVariables.cpp @@ -203,7 +203,7 @@ bool LiveVariables::addRegisterKilled(unsigned IncomingReg, MachineInstr *MI, RegInfo->isSuperRegister(IncomingReg, Reg) && MO.isKill()) // A super-register kill already exists. - return true; + Found = true; } } @@ -357,7 +357,9 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) { } else if (PhysRegPartUse[Reg]) // Add implicit use / kill to last partial use. addRegisterKilled(Reg, PhysRegPartUse[Reg], true); - else + else if (LastRef != MI) + // Defined, but not used. However, watch out for cases where a super-reg + // is also defined on the same MI. addRegisterDead(Reg, LastRef); } |