Added PHI Def & Kill tracking to PHIElimination pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76849 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp
index dc799e8..1cbe798 100644
--- a/lib/CodeGen/PHIElimination.cpp
+++ b/lib/CodeGen/PHIElimination.cpp
@@ -182,6 +182,10 @@
TII->copyRegToReg(MBB, AfterPHIsIt, DestReg, IncomingReg, RC, RC);
}
+ // Record PHI def.
+ //assert(!hasPHIDef(DestReg) && "Vreg has multiple phi-defs?");
+ //PHIDefs[DestReg] = &MBB;
+
// Update live variable information if there is any.
LiveVariables *LV = getAnalysisIfAvailable<LiveVariables>();
if (LV) {
@@ -223,6 +227,13 @@
assert(TargetRegisterInfo::isVirtualRegister(SrcReg) &&
"Machine PHI Operands must all be virtual registers!");
+ // Get the MachineBasicBlock equivalent of the BasicBlock that is the source
+ // path the PHI.
+ MachineBasicBlock &opBlock = *MPhi->getOperand(i*2+2).getMBB();
+
+ // Record the kill.
+ //PHIKills[SrcReg].insert(&opBlock);
+
// If source is defined by an implicit def, there is no need to insert a
// copy.
MachineInstr *DefMI = MRI->getVRegDef(SrcReg);
@@ -231,10 +242,6 @@
continue;
}
- // Get the MachineBasicBlock equivalent of the BasicBlock that is the source
- // path the PHI.
- MachineBasicBlock &opBlock = *MPhi->getOperand(i*2+2).getMBB();
-
// Check to make sure we haven't already emitted the copy for this block.
// This can happen because PHI nodes may have multiple entries for the same
// basic block.