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authorLang Hames <lhames@gmail.com>2012-01-28 01:17:01 +0000
committerLang Hames <lhames@gmail.com>2012-01-28 01:17:01 +0000
commit1c1c5bba577c710bdea01d084418d62281481cad (patch)
tree927bb5a3bf6e1daba44b7e92171c1cc252e08dac /lib/CodeGen
parentafcb5b5ee854474a50dc4642a6e6ecc15acfe8cc (diff)
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Remove code that adds live ranges for dead defs. It seems to be breaking things.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149163 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
-rw-r--r--lib/CodeGen/RegisterCoalescer.cpp24
1 files changed, 0 insertions, 24 deletions
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp
index 698c2cf..22e3d4b 100644
--- a/lib/CodeGen/RegisterCoalescer.cpp
+++ b/lib/CodeGen/RegisterCoalescer.cpp
@@ -841,19 +841,6 @@ bool RegisterCoalescer::ReMaterializeTrivialDef(LiveInterval &SrcInt,
TII->reMaterialize(*MBB, MII, DstReg, 0, DefMI, *TRI);
MachineInstr *NewMI = prior(MII);
- // NewMI may have dead implicit defs (E.g. EFLAGS for MOV<bits>r0 on X86).
- // We need to remember these so we can add intervals once we insert
- // NewMI into SlotIndexes.
- SmallVector<unsigned, 4> NewMIImplDefs;
- for (unsigned i = NewMI->getDesc().getNumOperands(),
- e = NewMI->getNumOperands(); i != e; ++i) {
- MachineOperand &MO = NewMI->getOperand(i);
- if (MO.isReg()) {
- assert(MO.isDef() && MO.isImplicit() && MO.isDead());
- NewMIImplDefs.push_back(MO.getReg());
- }
- }
-
// CopyMI may have implicit operands, transfer them over to the newly
// rematerialized instruction. And update implicit def interval valnos.
for (unsigned i = CopyMI->getDesc().getNumOperands(),
@@ -866,17 +853,6 @@ bool RegisterCoalescer::ReMaterializeTrivialDef(LiveInterval &SrcInt,
}
LIS->ReplaceMachineInstrInMaps(CopyMI, NewMI);
-
- SlotIndex NewMIIdx = LIS->getInstructionIndex(NewMI);
- for (unsigned i = 0, e = NewMIImplDefs.size(); i != e; ++i) {
- unsigned reg = NewMIImplDefs[i];
- LiveInterval &li = LIS->getInterval(reg);
- VNInfo *DeadDefVN = li.getNextValue(NewMIIdx.getRegSlot(), 0,
- LIS->getVNInfoAllocator());
- LiveRange lr(NewMIIdx.getRegSlot(), NewMIIdx.getDeadSlot(), DeadDefVN);
- li.addRange(lr);
- }
-
NewMI->copyImplicitOps(CopyMI);
CopyMI->eraseFromParent();
ReMatCopies.insert(CopyMI);