TableGen's regpressure: emit per-registerclass weight limits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154518 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 1 deletions

diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h
index 48b850e49f..7d8a46b49a 100644
--- a/include/llvm/Target/TargetRegisterInfo.h
+++ b/include/llvm/Target/TargetRegisterInfo.h
@@ -202,6 +202,13 @@ struct TargetRegisterInfoDesc {
   bool inAllocatableClass;      // Register belongs to an allocatable regclass.
 };
 
+/// Each TargetRegisterClass has a per register weight, and weight
+/// limit which must be less than the limits of its pressure sets.
+struct RegClassWeight {
+  unsigned RegWeigt;
+  unsigned WeightLimit;
+};
+
 /// TargetRegisterInfo base class - We assume that the target defines a static
 /// array of TargetRegisterDesc objects that represent all of the machine
 /// registers that the target has.  As such, we simply have to track a pointer
@@ -509,7 +516,8 @@ public:
   }
 
   /// Get the weight in units of pressure for this register class.
-  virtual unsigned getRegClassWeight(const TargetRegisterClass *RC) const = 0;
+  virtual const RegClassWeight &getRegClassWeight(
+    const TargetRegisterClass *RC) const = 0;
 
   /// Get the number of dimensions of register pressure.
   virtual unsigned getNumRegPressureSets() const = 0;