1 files changed, 24 insertions, 2 deletions
diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h
index 958bea6..b0c21c1 100644
--- a/include/llvm/Target/TargetRegisterInfo.h
+++ b/include/llvm/Target/TargetRegisterInfo.h
@@ -672,6 +672,28 @@ public:
     // Do nothing.
   }
 
+  /// Allow the target to reverse allocation order of local live ranges. This
+  /// will generally allocate shorter local live ranges first. For targets with
+  /// many registers, this could reduce regalloc compile time by a large
+  /// factor. It is disabled by default for three reasons:
+  /// (1) Top-down allocation is simpler and easier to debug for targets that
+  /// don't benefit from reversing the order.
+  /// (2) Bottom-up allocation could result in poor evicition decisions on some
+  /// targets affecting the performance of compiled code.
+  /// (3) Bottom-up allocation is no longer guaranteed to optimally color.
+  virtual bool reverseLocalAssignment() const { return false; }
+
+  /// Allow the target to override register assignment heuristics based on the
+  /// live range size. If this returns false, then local live ranges are always
+  /// assigned in order regardless of their size. This is a temporary hook for
+  /// debugging downstream codegen failures exposed by regalloc.
+  virtual bool mayOverrideLocalAssignment() const { return true; }
+
+  /// Allow the target to override the cost of using a callee-saved register for
+  /// the first time. Default value of 0 means we will use a callee-saved
+  /// register if it is available.
+  virtual unsigned getCSRFirstUseCost() const { return 0; }
+
   /// requiresRegisterScavenging - returns true if the target requires (and can
   /// make use of) the register scavenger.
   virtual bool requiresRegisterScavenging(const MachineFunction &MF) const {
@@ -748,8 +770,8 @@ public:
 
   /// resolveFrameIndex - Resolve a frame index operand of an instruction
   /// to reference the indicated base register plus offset instead.
-  virtual void resolveFrameIndex(MachineBasicBlock::iterator I,
-                                 unsigned BaseReg, int64_t Offset) const {
+  virtual void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
+                                 int64_t Offset) const {
     llvm_unreachable("resolveFrameIndex does not exist on this target");
   }