Add VirtRegMap::rewrite() and use it in the new register allocators.

The rewriter works almost identically to -rewriter=trivial, except it also
eliminates any identity copies.

This makes the new register allocators independent of VirtRegRewriter.cpp which
will be going away at the same time as RegAllocLinearScan.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125967 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/CodeGen/VirtRegMap.h b/lib/CodeGen/VirtRegMap.h
index cbc96bbd4f..a43ac5fc82 100644
--- a/lib/CodeGen/VirtRegMap.h
+++ b/lib/CodeGen/VirtRegMap.h
@@ -35,6 +35,7 @@ namespace llvm {
   class TargetInstrInfo;
   class TargetRegisterInfo;
   class raw_ostream;
+  class SlotIndexes;
 
   class VirtRegMap : public MachineFunctionPass {
   public:
@@ -493,6 +494,13 @@ namespace llvm {
       return 0;
     }
 
+    /// rewrite - Rewrite all instructions in MF to use only physical registers
+    /// by mapping all virtual register operands to their assigned physical
+    /// registers.
+    ///
+    /// @param Indexes Optionally remove deleted instructions from indexes.
+    void rewrite(SlotIndexes *Indexes);
+
     void print(raw_ostream &OS, const Module* M = 0) const;
     void dump() const;
   };