//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_CODEGEN_ALLOCATIONORDER_H
-#define LLVM_CODEGEN_ALLOCATIONORDER_H
+#ifndef LLVM_LIB_CODEGEN_ALLOCATIONORDER_H
+#define LLVM_LIB_CODEGEN_ALLOCATIONORDER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/MC/MCRegisterInfo.h"
const VirtRegMap &VRM,
const RegisterClassInfo &RegClassInfo);
+ /// Get the allocation order without reordered hints.
+ ArrayRef<MCPhysReg> getOrder() const { return Order; }
+
/// Return the next physical register in the allocation order, or 0.
/// It is safe to call next() again after it returned 0, it will keep
/// returning 0 until rewind() is called.
- unsigned next() {
+ unsigned next(unsigned Limit = 0) {
if (Pos < 0)
return Hints.end()[Pos++];
- while (Pos < int(Order.size())) {
+ if (!Limit)
+ Limit = Order.size();
+ while (Pos < int(Limit)) {
unsigned Reg = Order[Pos++];
if (!isHint(Reg))
return Reg;
return 0;
}
+ /// As next(), but allow duplicates to be returned, and stop before the
+ /// Limit'th register in the RegisterClassInfo allocation order.
+ ///
+ /// This can produce more than Limit registers if there are hints.
+ unsigned nextWithDups(unsigned Limit) {
+ if (Pos < 0)
+ return Hints.end()[Pos++];
+ if (Pos < int(Limit))
+ return Order[Pos++];
+ return 0;
+ }
+
/// Start over from the beginning.
void rewind() { Pos = -int(Hints.size()); }