It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegMap.h b/lib/CodeGen/VirtRegMap.h
new file mode 100644
index 0000000..b7cbe51c
--- /dev/null
+++ b/lib/CodeGen/VirtRegMap.h
@@ -0,0 +1,211 @@
+//===-- llvm/CodeGen/VirtRegMap.h - Virtual Register Map -*- 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.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a virtual register map. This maps virtual registers to
+// physical registers and virtual registers to stack slots. It is created and
+// updated by a register allocator and then used by a machine code rewriter that
+// adds spill code and rewrites virtual into physical register references.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_VIRTREGMAP_H
+#define LLVM_CODEGEN_VIRTREGMAP_H
+
+#include "llvm/Target/MRegisterInfo.h"
+#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/IndexedMap.h"
+#include "llvm/Support/Streams.h"
+#include <map>
+
+namespace llvm {
+ class MachineInstr;
+ class TargetInstrInfo;
+
+ class VirtRegMap {
+ public:
+ enum {
+ NO_PHYS_REG = 0,
+ NO_STACK_SLOT = (1L << 30)-1,
+ MAX_STACK_SLOT = (1L << 18)-1
+ };
+
+ enum ModRef { isRef = 1, isMod = 2, isModRef = 3 };
+ typedef std::multimap<MachineInstr*,
+ std::pair<unsigned, ModRef> > MI2VirtMapTy;
+
+ private:
+ const TargetInstrInfo &TII;
+
+ MachineFunction &MF;
+ /// Virt2PhysMap - This is a virtual to physical register
+ /// mapping. Each virtual register is required to have an entry in
+ /// it; even spilled virtual registers (the register mapped to a
+ /// spilled register is the temporary used to load it from the
+ /// stack).
+ IndexedMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap;
+ /// Virt2StackSlotMap - This is virtual register to stack slot
+ /// mapping. Each spilled virtual register has an entry in it
+ /// which corresponds to the stack slot this register is spilled
+ /// at.
+ IndexedMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
+ /// MI2VirtMap - This is MachineInstr to virtual register
+ /// mapping. In the case of memory spill code being folded into
+ /// instructions, we need to know which virtual register was
+ /// read/written by this instruction.
+ MI2VirtMapTy MI2VirtMap;
+
+ /// ReMatMap - This is virtual register to re-materialized instruction
+ /// mapping. Each virtual register whose definition is going to be
+ /// re-materialized has an entry in it.
+ std::map<unsigned, const MachineInstr*> ReMatMap;
+
+ /// ReMatId - Instead of assigning a stack slot to a to be rematerialized
+ /// virtual register, an unique id is being assigned. This keeps track of
+ /// the highest id used so far. Note, this starts at (1<<18) to avoid
+ /// conflicts with stack slot numbers.
+ int ReMatId;
+
+ VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
+ void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
+
+ public:
+ VirtRegMap(MachineFunction &mf);
+
+ void grow();
+
+ /// @brief returns true if the specified virtual register is
+ /// mapped to a physical register
+ bool hasPhys(unsigned virtReg) const {
+ return getPhys(virtReg) != NO_PHYS_REG;
+ }
+
+ /// @brief returns the physical register mapped to the specified
+ /// virtual register
+ unsigned getPhys(unsigned virtReg) const {
+ assert(MRegisterInfo::isVirtualRegister(virtReg));
+ return Virt2PhysMap[virtReg];
+ }
+
+ /// @brief creates a mapping for the specified virtual register to
+ /// the specified physical register
+ void assignVirt2Phys(unsigned virtReg, unsigned physReg) {
+ assert(MRegisterInfo::isVirtualRegister(virtReg) &&
+ MRegisterInfo::isPhysicalRegister(physReg));
+ assert(Virt2PhysMap[virtReg] == NO_PHYS_REG &&
+ "attempt to assign physical register to already mapped "
+ "virtual register");
+ Virt2PhysMap[virtReg] = physReg;
+ }
+
+ /// @brief clears the specified virtual register's, physical
+ /// register mapping
+ void clearVirt(unsigned virtReg) {
+ assert(MRegisterInfo::isVirtualRegister(virtReg));
+ assert(Virt2PhysMap[virtReg] != NO_PHYS_REG &&
+ "attempt to clear a not assigned virtual register");
+ Virt2PhysMap[virtReg] = NO_PHYS_REG;
+ }
+
+ /// @brief clears all virtual to physical register mappings
+ void clearAllVirt() {
+ Virt2PhysMap.clear();
+ grow();
+ }
+
+ /// @brief returns true is the specified virtual register is
+ /// mapped to a stack slot
+ bool hasStackSlot(unsigned virtReg) const {
+ return getStackSlot(virtReg) != NO_STACK_SLOT;
+ }
+
+ /// @brief returns the stack slot mapped to the specified virtual
+ /// register
+ int getStackSlot(unsigned virtReg) const {
+ assert(MRegisterInfo::isVirtualRegister(virtReg));
+ return Virt2StackSlotMap[virtReg];
+ }
+
+ /// @brief create a mapping for the specifed virtual register to
+ /// the next available stack slot
+ int assignVirt2StackSlot(unsigned virtReg);
+ /// @brief create a mapping for the specified virtual register to
+ /// the specified stack slot
+ void assignVirt2StackSlot(unsigned virtReg, int frameIndex);
+
+ /// @brief assign an unique re-materialization id to the specified
+ /// virtual register.
+ int assignVirtReMatId(unsigned virtReg);
+
+ /// @brief returns true if the specified virtual register is being
+ /// re-materialized.
+ bool isReMaterialized(unsigned virtReg) const {
+ return ReMatMap.count(virtReg) != 0;
+ }
+
+ /// @brief returns the original machine instruction being re-issued
+ /// to re-materialize the specified virtual register.
+ const MachineInstr *getReMaterializedMI(unsigned virtReg) {
+ return ReMatMap[virtReg];
+ }
+
+ /// @brief records the specified virtual register will be
+ /// re-materialized and the original instruction which will be re-issed
+ /// for this purpose.
+ void setVirtIsReMaterialized(unsigned virtReg, MachineInstr *def) {
+ ReMatMap[virtReg] = def;
+ }
+
+ /// @brief Updates information about the specified virtual register's value
+ /// folded into newMI machine instruction. The OpNum argument indicates the
+ /// operand number of OldMI that is folded.
+ void virtFolded(unsigned VirtReg, MachineInstr *OldMI, unsigned OpNum,
+ MachineInstr *NewMI);
+
+ /// @brief returns the virtual registers' values folded in memory
+ /// operands of this instruction
+ std::pair<MI2VirtMapTy::const_iterator, MI2VirtMapTy::const_iterator>
+ getFoldedVirts(MachineInstr* MI) const {
+ return MI2VirtMap.equal_range(MI);
+ }
+
+ /// RemoveFromFoldedVirtMap - If the specified machine instruction is in
+ /// the folded instruction map, remove its entry from the map.
+ void RemoveFromFoldedVirtMap(MachineInstr *MI) {
+ MI2VirtMap.erase(MI);
+ }
+
+ void print(std::ostream &OS) const;
+ void print(std::ostream *OS) const { if (OS) print(*OS); }
+ void dump() const;
+ };
+
+ inline std::ostream *operator<<(std::ostream *OS, const VirtRegMap &VRM) {
+ VRM.print(OS);
+ return OS;
+ }
+ inline std::ostream &operator<<(std::ostream &OS, const VirtRegMap &VRM) {
+ VRM.print(OS);
+ return OS;
+ }
+
+ /// Spiller interface: Implementations of this interface assign spilled
+ /// virtual registers to stack slots, rewriting the code.
+ struct Spiller {
+ virtual ~Spiller();
+ virtual bool runOnMachineFunction(MachineFunction &MF,
+ VirtRegMap &VRM) = 0;
+ };
+
+ /// createSpiller - Create an return a spiller object, as specified on the
+ /// command line.
+ Spiller* createSpiller();
+
+} // End llvm namespace
+
+#endif