Move getBundleStart() into MachineInstrBundle.h.

This allows the function to be inlined, and makes it suitable for use in
getInstructionIndex().

Also provide a const version. C++ is great for touch typing practice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151782 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 1 deletions

diff --git a/include/llvm/CodeGen/MachineInstrBundle.h b/include/llvm/CodeGen/MachineInstrBundle.h
index 9552e21fca..0fb4969822 100644
--- a/include/llvm/CodeGen/MachineInstrBundle.h
+++ b/include/llvm/CodeGen/MachineInstrBundle.h
@@ -41,6 +41,22 @@ MachineBasicBlock::instr_iterator finalizeBundle(MachineBasicBlock &MBB,
 /// MachineFunction. Return true if any bundles are finalized.
 bool finalizeBundles(MachineFunction &MF);
 
+/// getBundleStart - Returns the first instruction in the bundle containing MI.
+///
+static inline MachineInstr *getBundleStart(MachineInstr *MI) {
+  MachineBasicBlock::instr_iterator I = MI;
+  while (I->isInsideBundle())
+    --I;
+  return I;
+}
+
+static inline const MachineInstr *getBundleStart(const MachineInstr *MI) {
+  MachineBasicBlock::const_instr_iterator I = MI;
+  while (I->isInsideBundle())
+    --I;
+  return I;
+}
+
 //===----------------------------------------------------------------------===//
 // MachineOperand iterator
 //
@@ -82,7 +98,7 @@ protected:
   ///
   explicit MachineOperandIteratorBase(MachineInstr *MI, bool WholeBundle) {
     if (WholeBundle) {
-      InstrI = MI->getBundleStart();
+      InstrI = getBundleStart(MI);
       InstrE = MI->getParent()->instr_end();
     } else {
       InstrI = InstrE = MI;