Add SkipPHIsAndLabels from PHIElimination to MachineBasicBlock. It is needed

elsewhere.

llvm-svn: 117763

include/llvm/CodeGen/MachineBasicBlock.h

@@ -290,6 +290,11 @@ public:
   /// Returns end() is there's no non-PHI instruction.
   iterator getFirstNonPHI();
 
+  /// SkipPHIsAndLabels - Return the first instruction in MBB after I that is
+  /// not a PHI or a label. This is the correct point to insert copies at the
+  /// beginning of a basic block.
+  iterator SkipPHIsAndLabels(iterator I);
+
   /// getFirstTerminator - returns an iterator to the first terminator
   /// instruction of this basic block. If a terminator does not exist,
   /// it returns end()

lib/CodeGen/MachineBasicBlock.cpp

@@ -147,6 +147,13 @@ MachineBasicBlock::iterator MachineBasicBlock::getFirstNonPHI() {
   return I;
 }
 
+MachineBasicBlock::iterator
+MachineBasicBlock::SkipPHIsAndLabels(MachineBasicBlock::iterator I) {
+  while (I != end() && (I->isPHI() || I->isLabel() || I->isDebugValue()))
+    ++I;
+  return I;
+}
+
 MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator() {
   iterator I = end();
   while (I != begin() && (--I)->getDesc().isTerminator())