Allow any MachineBasicBlock (not just the entry block) to have live-in physical

registers. Make sure liveinterval analysis is correctly creating live ranges
for them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34217 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 8 deletions

diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp
index e0713c87c9..c0da92c658 100644
--- a/lib/CodeGen/LiveVariables.cpp
+++ b/lib/CodeGen/LiveVariables.cpp
@@ -254,14 +254,6 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
   /// Get some space for a respectable number of registers...
   VirtRegInfo.resize(64);
 
-  // Mark live-in registers as live-in.
-  for (MachineFunction::livein_iterator I = MF.livein_begin(),
-         E = MF.livein_end(); I != E; ++I) {
-    assert(MRegisterInfo::isPhysicalRegister(I->first) &&
-           "Cannot have a live-in virtual register!");
-    HandlePhysRegDef(I->first, 0);
-  }
-
   analyzePHINodes(MF);
 
   // Calculate live variable information in depth first order on the CFG of the
@@ -275,6 +267,14 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
          E = df_ext_end(Entry, Visited); DFI != E; ++DFI) {
     MachineBasicBlock *MBB = *DFI;
 
+  // Mark live-in registers as live-in.
+    for (MachineBasicBlock::livein_iterator II = MBB->livein_begin(),
+           EE = MBB->livein_end(); II != EE; ++II) {
+      assert(MRegisterInfo::isPhysicalRegister(*II) &&
+             "Cannot have a live-in virtual register!");
+      HandlePhysRegDef(*II, 0);
+    }
+
     // Loop over all of the instructions, processing them.
     for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
          I != E; ++I) {