Simplify the tracking of used physregs to a bulk bitor followed by a transitive

closure after allocating all blocks.

Add a few more test cases for -regalloc=fast.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103500 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 2 deletions

diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h
index b377dec..905be96 100644
--- a/include/llvm/CodeGen/MachineRegisterInfo.h
+++ b/include/llvm/CodeGen/MachineRegisterInfo.h
@@ -229,11 +229,18 @@ public:
   /// setPhysRegUsed - Mark the specified register used in this function.
   /// This should only be called during and after register allocation.
   void setPhysRegUsed(unsigned Reg) { UsedPhysRegs[Reg] = true; }
-  
+
+  /// addPhysRegsUsed - Mark the specified registers used in this function.
+  /// This should only be called during and after register allocation.
+  void addPhysRegsUsed(const BitVector &Regs) { UsedPhysRegs |= Regs; }
+
   /// setPhysRegUnused - Mark the specified register unused in this function.
   /// This should only be called during and after register allocation.
   void setPhysRegUnused(unsigned Reg) { UsedPhysRegs[Reg] = false; }
-  
+
+  /// closePhysRegsUsed - Expand UsedPhysRegs to its transitive closure over
+  /// subregisters. That means that if R is used, so are all subregisters.
+  void closePhysRegsUsed(const TargetRegisterInfo&);
 
   //===--------------------------------------------------------------------===//
   // LiveIn/LiveOut Management