mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-30 02:32:08 +00:00
32dfbeada7
(almost) a register copy. However, it always coalesced to the register of the RHS (the super-register). All uses of the result of a EXTRACT_SUBREG are sub- register uses which adds subtle complications to load folding, spiller rewrite, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42899 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
//===-- llvm/CodeGen/SSARegMap.h --------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Map register numbers to register classes that are correctly sized (typed) to
|
|
// hold the information. Assists register allocation. Contained by
|
|
// MachineFunction, should be deleted by register allocator when it is no
|
|
// longer needed.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_SSAREGMAP_H
|
|
#define LLVM_CODEGEN_SSAREGMAP_H
|
|
|
|
#include "llvm/Target/MRegisterInfo.h"
|
|
#include "llvm/ADT/IndexedMap.h"
|
|
|
|
namespace llvm {
|
|
|
|
class TargetRegisterClass;
|
|
|
|
class SSARegMap {
|
|
IndexedMap<const TargetRegisterClass*, VirtReg2IndexFunctor> RegClassMap;
|
|
IndexedMap<std::pair<unsigned, unsigned>, VirtReg2IndexFunctor> RegSubIdxMap;
|
|
unsigned NextRegNum;
|
|
|
|
public:
|
|
SSARegMap() : NextRegNum(MRegisterInfo::FirstVirtualRegister) { }
|
|
|
|
const TargetRegisterClass* getRegClass(unsigned Reg) {
|
|
return RegClassMap[Reg];
|
|
}
|
|
|
|
/// createVirtualRegister - Create and return a new virtual register in the
|
|
/// function with the specified register class.
|
|
///
|
|
unsigned createVirtualRegister(const TargetRegisterClass *RegClass) {
|
|
assert(RegClass && "Cannot create register without RegClass!");
|
|
RegClassMap.grow(NextRegNum);
|
|
RegClassMap[NextRegNum] = RegClass;
|
|
RegSubIdxMap.grow(NextRegNum);
|
|
RegSubIdxMap[NextRegNum] = std::make_pair(0,0);
|
|
return NextRegNum++;
|
|
}
|
|
|
|
unsigned getLastVirtReg() const {
|
|
return NextRegNum - 1;
|
|
}
|
|
|
|
void setIsSubRegister(unsigned Reg, unsigned SuperReg, unsigned SubIdx) {
|
|
RegSubIdxMap[Reg] = std::make_pair(SuperReg, SubIdx);
|
|
}
|
|
|
|
bool isSubRegister(unsigned Reg) const {
|
|
return RegSubIdxMap[Reg].first != 0;
|
|
}
|
|
|
|
unsigned getSuperRegister(unsigned Reg) const {
|
|
return RegSubIdxMap[Reg].first;
|
|
}
|
|
|
|
unsigned getSubRegisterIndex(unsigned Reg) const {
|
|
return RegSubIdxMap[Reg].second;
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|