diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2010-05-12 23:59:42 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-05-12 23:59:42 +0000 |
| commit | de7dea2e44ea59674acb5680482cd516c6fce3bb (patch) | |
| tree | 29f136973962d916a72d2333d35ea712c04ccab0 | |
| parent | 3519f9d7d179ac1a77a4721b2e5f8123f95af418 (diff) | |
Do not attempt copy coalescing if the source and dest sub-register indices do not match.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103679 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/RegAllocLocal.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/CodeGen/RegAllocLocal.cpp b/lib/CodeGen/RegAllocLocal.cpp index 0a14e29237..6372559824 100644 --- a/lib/CodeGen/RegAllocLocal.cpp +++ b/lib/CodeGen/RegAllocLocal.cpp @@ -846,7 +846,8 @@ void RALocal::AllocateBasicBlock(MachineBasicBlock &MBB) { unsigned SrcCopyReg, DstCopyReg, SrcCopySubReg, DstCopySubReg; unsigned SrcCopyPhysReg = 0U; bool isCopy = TII->isMoveInstr(*MI, SrcCopyReg, DstCopyReg, - SrcCopySubReg, DstCopySubReg); + SrcCopySubReg, DstCopySubReg) && + SrcCopySubReg == DstCopySubReg; if (isCopy && TargetRegisterInfo::isVirtualRegister(SrcCopyReg)) SrcCopyPhysReg = getVirt2PhysRegMapSlot(SrcCopyReg); @@ -1154,7 +1155,8 @@ void RALocal::AllocateBasicBlock(MachineBasicBlock &MBB) { // the register scavenger. See pr4100.) if (TII->isMoveInstr(*MI, SrcCopyReg, DstCopyReg, SrcCopySubReg, DstCopySubReg) && - SrcCopyReg == DstCopyReg && DeadDefs.empty()) + SrcCopyReg == DstCopyReg && SrcCopySubReg == DstCopySubReg && + DeadDefs.empty()) MBB.erase(MI); } |