Move LiveRegUnits implementation into .cpp. Comment and format.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192621 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 87 deletions

diff --git a/include/llvm/CodeGen/LiveRegUnits.h b/include/llvm/CodeGen/LiveRegUnits.h
index c7b811d..0c6df88 100644
--- a/include/llvm/CodeGen/LiveRegUnits.h
+++ b/include/llvm/CodeGen/LiveRegUnits.h
@@ -32,47 +32,30 @@ class LiveRegUnits {
   SmallSet<unsigned, 32> LiveUnits;
 
 public:
-  /// Constructs a new empty LiveRegUnits set.
-  LiveRegUnits() {
-  }
+  /// \brief Constructs a new empty LiveRegUnits set.
+  LiveRegUnits() {}
 
-  /// Constructs a new LiveRegUnits set by copying @p Other.
+  /// \brief Constructs a new LiveRegUnits set by copying @p Other.
   LiveRegUnits(const LiveRegUnits &Other)
     : LiveUnits(Other.LiveUnits) {
   }
 
-  /// Adds a register to the set.
+  /// \brief Adds a register to the set.
   void addReg(unsigned Reg, const MCRegisterInfo &MCRI) {
     for (MCRegUnitIterator RUnits(Reg, &MCRI); RUnits.isValid(); ++RUnits)
       LiveUnits.insert(*RUnits);
   }
 
-  /// Removes a register from the set.
+  /// \brief Removes a register from the set.
   void removeReg(unsigned Reg, const MCRegisterInfo &MCRI) {
     for (MCRegUnitIterator RUnits(Reg, &MCRI); RUnits.isValid(); ++RUnits)
       LiveUnits.erase(*RUnits);
   }
 
   /// \brief Removes registers clobbered by the regmask operand @p Op.
-  /// Note that we assume the high bits of a physical super register are not
-  /// preserved unless the instruction has an implicit-use operand reading
-  /// the super-register or a register unit for the upper bits is available.
-  void removeRegsInMask(const MachineOperand &Op,
-                        const MCRegisterInfo &MCRI) {
-    const uint32_t *Mask = Op.getRegMask();
-    unsigned Bit = 0;
-    for (unsigned R = 0; R < MCRI.getNumRegs(); ++R) {
-      if ((*Mask & (1u << Bit)) == 0)
-        removeReg(R, MCRI);
-      ++Bit;
-      if (Bit >= 32) {
-        Bit = 0;
-        ++Mask;
-      }
-    }
-  }
+  void removeRegsInMask(const MachineOperand &Op, const MCRegisterInfo &MCRI);
 
-  /// Returns true if register @p Reg (or one of its super register) is
+  /// \brief Returns true if register @p Reg (or one of its super register) is
   /// contained in the set.
   bool contains(unsigned Reg, const MCRegisterInfo &MCRI) const {
     for (MCRegUnitIterator RUnits(Reg, &MCRI); RUnits.isValid(); ++RUnits) {
@@ -82,73 +65,16 @@ public:
     return false;
   }
 
-  /// Simulates liveness when stepping backwards over an instruction(bundle):
-  /// Defs are removed from the set, uses added.
-  void stepBackward(const MachineInstr &MI, const MCRegisterInfo &MCRI) {
-    // Remove defined registers and regmask kills from the set.
-    for (ConstMIBundleOperands O(&MI); O.isValid(); ++O) {
-      if (O->isReg()) {
-        if (!O->isDef())
-          continue;
-        unsigned Reg = O->getReg();
-        if (Reg == 0)
-          continue;
-        removeReg(Reg, MCRI);
-      } else if (O->isRegMask()) {
-        removeRegsInMask(*O, MCRI);
-      }
-    }
-    // Add uses to the set.
-    for (ConstMIBundleOperands O(&MI); O.isValid(); ++O) {
-      if (!O->isReg() || !O->readsReg() || O->isUndef())
-        continue;
-      unsigned Reg = O->getReg();
-      if (Reg == 0)
-        continue;
-      addReg(Reg, MCRI);
-    }
-  }
+  /// \brief Simulates liveness when stepping backwards over an
+  /// instruction(bundle): Remove Defs, add uses.
+  void stepBackward(const MachineInstr &MI, const MCRegisterInfo &MCRI);
 
   /// \brief Simulates liveness when stepping forward over an
-  /// instruction(bundle).
-  ///
-  /// Uses with kill flag get removed from the set, defs added. If possible
-  /// use StepBackward() instead of this function because some kill flags may
-  /// be missing.
-  void stepForward(const MachineInstr &MI, const MCRegisterInfo &MCRI) {
-    SmallVector<unsigned, 4> Defs;
-    // Remove killed registers from the set.
-    for (ConstMIBundleOperands O(&MI); O.isValid(); ++O) {
-      if (O->isReg()) {
-        unsigned Reg = O->getReg();
-        if (Reg == 0)
-          continue;
-        if (O->isDef()) {
-          if (!O->isDead())
-            Defs.push_back(Reg);
-        } else {
-          if (!O->isKill())
-            continue;
-          assert(O->isUse());
-          removeReg(Reg, MCRI);
-        }
-      } else if (O->isRegMask()) {
-        removeRegsInMask(*O, MCRI);
-      }
-    }
-    // Add defs to the set.
-    for (unsigned i = 0, e = Defs.size(); i != e; ++i) {
-      addReg(Defs[i], MCRI);
-    }
-  }
+  /// instruction(bundle): Remove killed-uses, add defs.
+  void stepForward(const MachineInstr &MI, const MCRegisterInfo &MCRI);
 
   /// Adds all registers in the live-in list of block @p BB.
-  void addLiveIns(const MachineBasicBlock &BB, const MCRegisterInfo &MCRI) {
-    for (MachineBasicBlock::livein_iterator L = BB.livein_begin(),
-         LE = BB.livein_end(); L != LE; ++L) {
-      addReg(*L, MCRI);
-    }
-  }
+  void addLiveIns(const MachineBasicBlock &BB, const MCRegisterInfo &MCRI);
 };
 
 } // namespace llvm