/// getRegPressureLimit - Return the register pressure "high water mark" for
/// the specific register class. The scheduler is in high register pressure
/// mode (for the specific register class) if it goes over the limit.
+ ///
+ /// Note: this is the old register pressure model that relies on a manually
+ /// specified representative register class per value type.
virtual unsigned getRegPressureLimit(const TargetRegisterClass *RC,
MachineFunction &MF) const {
return 0;
}
+ /// Get the weight in units of pressure for this register class.
+ virtual unsigned getRegClassWeight(const TargetRegisterClass *RC) const = 0;
+
+ /// Get the number of dimensions of register pressure.
+ virtual unsigned getNumRegPressureSets() const = 0;
+
+ /// Get the register unit pressure limit for this dimension.
+ /// This limit must be adjusted dynamically for reserved registers.
+ virtual unsigned getRegPressureSetLimit(unsigned Idx) const = 0;
+
+ /// Get the dimensions of register pressure impacted by this register class.
+ /// Returns a -1 terminated array of pressure set IDs.
+ virtual const int *getRegClassPressureSets(
+ const TargetRegisterClass *RC) const = 0;
+
/// getRawAllocationOrder - Returns the register allocation order for a
/// specified register class with a target-dependent hint. The returned list
/// may contain reserved registers that cannot be allocated.