Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/CodeGen/LiveRegUnits.h b/linux-x64/clang/include/llvm/CodeGen/LiveRegUnits.h
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+++ b/linux-x64/clang/include/llvm/CodeGen/LiveRegUnits.h
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+//===- llvm/CodeGen/LiveRegUnits.h - Register Unit Set ----------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// A set of register units. It is intended for register liveness tracking.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_LIVEREGUNITS_H
+#define LLVM_CODEGEN_LIVEREGUNITS_H
+
+#include "llvm/ADT/BitVector.h"
+#include "llvm/CodeGen/TargetRegisterInfo.h"
+#include "llvm/MC/LaneBitmask.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include <cstdint>
+
+namespace llvm {
+
+class MachineInstr;
+class MachineBasicBlock;
+
+/// A set of register units used to track register liveness.
+class LiveRegUnits {
+ const TargetRegisterInfo *TRI = nullptr;
+ BitVector Units;
+
+public:
+ /// Constructs a new empty LiveRegUnits set.
+ LiveRegUnits() = default;
+
+ /// Constructs and initialize an empty LiveRegUnits set.
+ LiveRegUnits(const TargetRegisterInfo &TRI) {
+ init(TRI);
+ }
+
+ /// Initialize and clear the set.
+ void init(const TargetRegisterInfo &TRI) {
+ this->TRI = &TRI;
+ Units.reset();
+ Units.resize(TRI.getNumRegUnits());
+ }
+
+ /// Clears the set.
+ void clear() { Units.reset(); }
+
+ /// Returns true if the set is empty.
+ bool empty() const { return Units.none(); }
+
+ /// Adds register units covered by physical register \p Reg.
+ void addReg(unsigned Reg) {
+ for (MCRegUnitIterator Unit(Reg, TRI); Unit.isValid(); ++Unit)
+ Units.set(*Unit);
+ }
+
+ /// \brief Adds register units covered by physical register \p Reg that are
+ /// part of the lanemask \p Mask.
+ void addRegMasked(unsigned Reg, LaneBitmask Mask) {
+ for (MCRegUnitMaskIterator Unit(Reg, TRI); Unit.isValid(); ++Unit) {
+ LaneBitmask UnitMask = (*Unit).second;
+ if (UnitMask.none() || (UnitMask & Mask).any())
+ Units.set((*Unit).first);
+ }
+ }
+
+ /// Removes all register units covered by physical register \p Reg.
+ void removeReg(unsigned Reg) {
+ for (MCRegUnitIterator Unit(Reg, TRI); Unit.isValid(); ++Unit)
+ Units.reset(*Unit);
+ }
+
+ /// Removes register units not preserved by the regmask \p RegMask.
+ /// The regmask has the same format as the one in the RegMask machine operand.
+ void removeRegsNotPreserved(const uint32_t *RegMask);
+
+ /// Adds register units not preserved by the regmask \p RegMask.
+ /// The regmask has the same format as the one in the RegMask machine operand.
+ void addRegsInMask(const uint32_t *RegMask);
+
+ /// Returns true if no part of physical register \p Reg is live.
+ bool available(unsigned Reg) const {
+ for (MCRegUnitIterator Unit(Reg, TRI); Unit.isValid(); ++Unit) {
+ if (Units.test(*Unit))
+ return false;
+ }
+ return true;
+ }
+
+ /// Updates liveness when stepping backwards over the instruction \p MI.
+ /// This removes all register units defined or clobbered in \p MI and then
+ /// adds the units used (as in use operands) in \p MI.
+ void stepBackward(const MachineInstr &MI);
+
+ /// Adds all register units used, defined or clobbered in \p MI.
+ /// This is useful when walking over a range of instruction to find registers
+ /// unused over the whole range.
+ void accumulate(const MachineInstr &MI);
+
+ /// Adds registers living out of block \p MBB.
+ /// Live out registers are the union of the live-in registers of the successor
+ /// blocks and pristine registers. Live out registers of the end block are the
+ /// callee saved registers.
+ void addLiveOuts(const MachineBasicBlock &MBB);
+
+ /// Adds registers living into block \p MBB.
+ void addLiveIns(const MachineBasicBlock &MBB);
+
+ /// Adds all register units marked in the bitvector \p RegUnits.
+ void addUnits(const BitVector &RegUnits) {
+ Units |= RegUnits;
+ }
+ /// Removes all register units marked in the bitvector \p RegUnits.
+ void removeUnits(const BitVector &RegUnits) {
+ Units.reset(RegUnits);
+ }
+ /// Return the internal bitvector representation of the set.
+ const BitVector &getBitVector() const {
+ return Units;
+ }
+
+private:
+ /// Adds pristine registers. Pristine registers are callee saved registers
+ /// that are unused in the function.
+ void addPristines(const MachineFunction &MF);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_LIVEREGUNITS_H