diff --git a/arch/alpha/arguments.cc b/arch/alpha/arguments.cc
index 019390aeb..a782ea330 100644
--- a/arch/alpha/arguments.cc
+++ b/arch/alpha/arguments.cc
@@ -54,7 +54,7 @@ AlphaArguments::getArg(bool fp)
 {
     if (number < 6) {
         if (fp)
-            return xc->readFloatRegInt(16 + number);
+            return xc->readFloatRegBits(16 + number);
         else
             return xc->readIntReg(16 + number);
     } else {
diff --git a/arch/alpha/ev5.cc b/arch/alpha/ev5.cc
index 019e83dd4..fed2f5358 100644
--- a/arch/alpha/ev5.cc
+++ b/arch/alpha/ev5.cc
@@ -134,7 +134,7 @@ AlphaISA::zeroRegisters(CPU *cpu)
     // (no longer very clean due to the change in setIntReg() in the
     // cpu model.  Consider changing later.)
     cpu->cpuXC->setIntReg(ZeroReg, 0);
-    cpu->cpuXC->setFloatRegDouble(ZeroReg, 0.0);
+    cpu->cpuXC->setFloatReg(ZeroReg, 0.0);
 }
 
 Fault
diff --git a/arch/alpha/registerfile.hh b/arch/alpha/registerfile.hh
index c2fb56ec1..13288e087 100644
--- a/arch/alpha/registerfile.hh
+++ b/arch/alpha/registerfile.hh
@@ -26,8 +26,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef __ARCH_ALPHA_REGISTERFILE_HH__
-#define __ARCH_ALPHA_REGISTERFILE_HH__
+#ifndef __ARCH_ALPHA_REGFILE_HH__
+#define __ARCH_ALPHA_REGFILE_HH__
 
 #include "arch/alpha/types.hh"
 #include "arch/alpha/constants.hh"
@@ -40,10 +40,64 @@ namespace AlphaISA
 
     typedef IntReg IntRegFile[NumIntRegs];
 
-    typedef union {
-        uint64_t q[NumFloatRegs];	// integer qword view
-        double d[NumFloatRegs];		// double-precision floating point view
-    } FloatRegFile;
+    class FloatRegFile
+    {
+      protected:
+
+        union {
+            uint64_t q[NumFloatRegs];	// integer qword view
+            double d[NumFloatRegs];	// double-precision floating point view
+        };
+
+      public:
+
+        FloatReg readReg(int floatReg)
+        {
+            return d[floatReg];
+        }
+
+        FloatReg readReg(int floatReg, int width)
+        {
+            return readReg(floatReg);
+        }
+
+        FloatRegBits readRegBits(int floatReg)
+        {
+            return q[floatReg];
+        }
+
+        FloatRegBits readRegBits(int floatReg, int width)
+        {
+            return readRegBits(floatReg);
+        }
+
+        Fault setReg(int floatReg, const FloatReg &val)
+        {
+            d[floatReg] = val;
+            return NoFault;
+        }
+
+        Fault setReg(int floatReg, const FloatReg &val, int width)
+        {
+            return setReg(floatReg, val);
+        }
+
+        Fault setRegBits(int floatReg, const FloatRegBits &val)
+        {
+            q[floatReg] = val;
+            return NoFault;
+        }
+
+        Fault setRegBits(int floatReg, const FloatRegBits &val, int width)
+        {
+            return setRegBits(floatReg, val);
+        }
+
+        void serialize(std::ostream &os);
+
+        void unserialize(Checkpoint *cp, const std::string &section);
+
+    };
 
     class MiscRegFile {
       protected:
diff --git a/arch/alpha/types.hh b/arch/alpha/types.hh
index 7af3bebd8..3cd93c6b0 100644
--- a/arch/alpha/types.hh
+++ b/arch/alpha/types.hh
@@ -54,10 +54,8 @@ namespace AlphaISA
     typedef uint64_t IntReg;
 
     // floating point register file entry type
-    typedef union {
-        uint64_t q;
-        double d;
-    } FloatReg;
+    typedef double FloatReg;
+    typedef uint64_t FloatRegBits;
 
     // control register file contents
     typedef uint64_t MiscReg;
diff --git a/arch/isa_parser.py b/arch/isa_parser.py
index 570110d84..3f836ed7e 100755
--- a/arch/isa_parser.py
+++ b/arch/isa_parser.py
@@ -1217,16 +1217,23 @@ class FloatRegOperand(Operand):
 
     def makeRead(self):
         bit_select = 0
+        width = 0;
         if (self.ctype == 'float'):
-            func = 'readFloatRegSingle'
+            func = 'readFloatReg'
+            width = 32;
         elif (self.ctype == 'double'):
-            func = 'readFloatRegDouble'
+            func = 'readFloatReg'
+            width = 64;
         else:
-            func = 'readFloatRegInt'
+            func = 'readFloatRegBits'
             if (self.size != self.dflt_size):
                 bit_select = 1
-        base = 'xc->%s(this, %d)' % \
-               (func, self.src_reg_idx)
+        if width:
+            base = 'xc->%s(this, %d, %d)' % \
+                   (func, self.src_reg_idx, width)
+        else:
+            base = 'xc->%s(this, %d)' % \
+                   (func, self.src_reg_idx)
         if bit_select:
             return '%s = bits(%s, %d, 0);\n' % \
                    (self.base_name, base, self.size-1)
@@ -1236,21 +1243,28 @@ class FloatRegOperand(Operand):
     def makeWrite(self):
         final_val = self.base_name
         final_ctype = self.ctype
+        widthSpecifier = ''
+        width = 0
         if (self.ctype == 'float'):
-            func = 'setFloatRegSingle'
+            width = 32
+            func = 'setFloatReg'
         elif (self.ctype == 'double'):
-            func = 'setFloatRegDouble'
+            width = 64
+            func = 'setFloatReg'
         else:
-            func = 'setFloatRegInt'
+            func = 'setFloatRegBits'
             final_ctype = 'uint%d_t' % self.dflt_size
             if (self.size != self.dflt_size and self.is_signed):
                 final_val = 'sext<%d>(%s)' % (self.size, self.base_name)
+        if width:
+            widthSpecifier = ', %d' % width
         wb = '''
         {
             %s final_val = %s;
-            xc->%s(this, %d, final_val);\n
+            xc->%s(this, %d, final_val%s);\n
             if (traceData) { traceData->setData(final_val); }
-        }''' % (final_ctype, final_val, func, self.dest_reg_idx)
+        }''' % (final_ctype, final_val, func, self.dest_reg_idx,
+                widthSpecifier)
         return wb
 
 class ControlRegOperand(Operand):
diff --git a/base/remote_gdb.cc b/base/remote_gdb.cc
index 84093459c..8a6cbdc33 100644
--- a/base/remote_gdb.cc
+++ b/base/remote_gdb.cc
@@ -440,7 +440,7 @@ RemoteGDB::getregs()
 
 #ifdef KGDB_FP_REGS
     for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) {
-        gdbregs[i + KGDB_REG_F0] = context->readFloatRegInt(i);
+        gdbregs[i + KGDB_REG_F0] = context->readFloatRegBits(i);
     }
 #endif
 }
@@ -467,7 +467,7 @@ RemoteGDB::setregs()
 
 #ifdef KGDB_FP_REGS
     for (int i = 0; i < TheISA::NumFloatArchRegs; ++i) {
-        context->setFloatRegInt(i, gdbregs[i + KGDB_REG_F0]);
+        context->setFloatRegBits(i, gdbregs[i + KGDB_REG_F0]);
     }
 #endif
     context->setPC(gdbregs[KGDB_REG_PC]);
diff --git a/cpu/cpu_exec_context.cc b/cpu/cpu_exec_context.cc
index 2ad9571ce..79a4c00c6 100644
--- a/cpu/cpu_exec_context.cc
+++ b/cpu/cpu_exec_context.cc
@@ -276,8 +276,7 @@ CPUExecContext::copyArchRegs(ExecContext *xc)
 
     // Then loop through the floating point registers.
     for (int i = 0; i < TheISA::NumFloatRegs; ++i) {
-        setFloatRegDouble(i, xc->readFloatRegDouble(i));
-        setFloatRegInt(i, xc->readFloatRegInt(i));
+        setFloatRegBits(i, xc->readFloatRegBits(i));
     }
 
     // Copy misc. registers
diff --git a/cpu/cpu_exec_context.hh b/cpu/cpu_exec_context.hh
index 509583d65..2a90e07d3 100644
--- a/cpu/cpu_exec_context.hh
+++ b/cpu/cpu_exec_context.hh
@@ -70,6 +70,8 @@ class CPUExecContext
     typedef TheISA::MachInst MachInst;
     typedef TheISA::MiscRegFile MiscRegFile;
     typedef TheISA::MiscReg MiscReg;
+    typedef TheISA::FloatReg FloatReg;
+    typedef TheISA::FloatRegBits FloatRegBits;
   public:
     typedef ExecContext::Status Status;
 
@@ -374,19 +376,24 @@ class CPUExecContext
         return regs.intRegFile[reg_idx];
     }
 
-    float readFloatRegSingle(int reg_idx)
+    FloatReg readFloatReg(int reg_idx, int width)
     {
-        return (float)regs.floatRegFile.d[reg_idx];
+        return regs.floatRegFile.readReg(reg_idx, width);
     }
 
-    double readFloatRegDouble(int reg_idx)
+    FloatReg readFloatReg(int reg_idx)
     {
-        return regs.floatRegFile.d[reg_idx];
+        return regs.floatRegFile.readReg(reg_idx);
     }
 
-    uint64_t readFloatRegInt(int reg_idx)
+    FloatRegBits readFloatRegBits(int reg_idx, int width)
     {
-        return regs.floatRegFile.q[reg_idx];
+        return regs.floatRegFile.readRegBits(reg_idx, width);
+    }
+
+    FloatRegBits readFloatRegBits(int reg_idx)
+    {
+        return regs.floatRegFile.readRegBits(reg_idx);
     }
 
     void setIntReg(int reg_idx, uint64_t val)
@@ -394,19 +401,24 @@ class CPUExecContext
         regs.intRegFile[reg_idx] = val;
     }
 
-    void setFloatRegSingle(int reg_idx, float val)
+    void setFloatReg(int reg_idx, FloatReg val, int width)
     {
-        regs.floatRegFile.d[reg_idx] = (double)val;
+        regs.floatRegFile.setReg(reg_idx, val, width);
     }
 
-    void setFloatRegDouble(int reg_idx, double val)
+    void setFloatReg(int reg_idx, FloatReg val)
     {
-        regs.floatRegFile.d[reg_idx] = val;
+        regs.floatRegFile.setReg(reg_idx, val);
     }
 
-    void setFloatRegInt(int reg_idx, uint64_t val)
+    void setFloatRegBits(int reg_idx, FloatRegBits val, int width)
     {
-        regs.floatRegFile.q[reg_idx] = val;
+        regs.floatRegFile.setRegBits(reg_idx, val, width);
+    }
+
+    void setFloatRegBits(int reg_idx, FloatRegBits val)
+    {
+        regs.floatRegFile.setRegBits(reg_idx, val);
     }
 
     uint64_t readPC()
diff --git a/cpu/exec_context.hh b/cpu/exec_context.hh
index d102757e6..2fdb19c73 100644
--- a/cpu/exec_context.hh
+++ b/cpu/exec_context.hh
@@ -54,6 +54,8 @@ class ExecContext
     typedef TheISA::RegFile RegFile;
     typedef TheISA::MachInst MachInst;
     typedef TheISA::IntReg IntReg;
+    typedef TheISA::FloatReg FloatReg;
+    typedef TheISA::FloatRegBits FloatRegBits;
     typedef TheISA::MiscRegFile MiscRegFile;
     typedef TheISA::MiscReg MiscReg;
   public:
@@ -165,19 +167,23 @@ class ExecContext
     //
     virtual uint64_t readIntReg(int reg_idx) = 0;
 
-    virtual float readFloatRegSingle(int reg_idx) = 0;
+    virtual FloatReg readFloatReg(int reg_idx, int width) = 0;
 
-    virtual double readFloatRegDouble(int reg_idx) = 0;
+    virtual FloatReg readFloatReg(int reg_idx) = 0;
 
-    virtual uint64_t readFloatRegInt(int reg_idx) = 0;
+    virtual FloatRegBits readFloatRegBits(int reg_idx, int width) = 0;
+
+    virtual FloatRegBits readFloatRegBits(int reg_idx) = 0;
 
     virtual void setIntReg(int reg_idx, uint64_t val) = 0;
 
-    virtual void setFloatRegSingle(int reg_idx, float val) = 0;
+    virtual void setFloatReg(int reg_idx, FloatReg val, int width) = 0;
 
-    virtual void setFloatRegDouble(int reg_idx, double val) = 0;
+    virtual void setFloatReg(int reg_idx, FloatReg val) = 0;
 
-    virtual void setFloatRegInt(int reg_idx, uint64_t val) = 0;
+    virtual void setFloatRegBits(int reg_idx, FloatRegBits val) = 0;
+
+    virtual void setFloatRegBits(int reg_idx, FloatRegBits val, int width) = 0;
 
     virtual uint64_t readPC() = 0;
 
@@ -333,26 +339,32 @@ class ProxyExecContext : public ExecContext
     uint64_t readIntReg(int reg_idx)
     { return actualXC->readIntReg(reg_idx); }
 
-    float readFloatRegSingle(int reg_idx)
-    { return actualXC->readFloatRegSingle(reg_idx); }
+    FloatReg readFloatReg(int reg_idx, int width)
+    { return actualXC->readFloatReg(reg_idx, width); }
 
-    double readFloatRegDouble(int reg_idx)
-    { return actualXC->readFloatRegDouble(reg_idx); }
+    FloatReg readFloatReg(int reg_idx)
+    { return actualXC->readFloatReg(reg_idx); }
 
-    uint64_t readFloatRegInt(int reg_idx)
-    { return actualXC->readFloatRegInt(reg_idx); }
+    FloatRegBits readFloatRegBits(int reg_idx, int width)
+    { return actualXC->readFloatRegBits(reg_idx, width); }
+
+    FloatRegBits readFloatRegBits(int reg_idx)
+    { return actualXC->readFloatRegBits(reg_idx); }
 
     void setIntReg(int reg_idx, uint64_t val)
     { actualXC->setIntReg(reg_idx, val); }
 
-    void setFloatRegSingle(int reg_idx, float val)
-    { actualXC->setFloatRegSingle(reg_idx, val); }
+    void setFloatReg(int reg_idx, FloatReg val, int width)
+    { actualXC->setFloatReg(reg_idx, val, width); }
 
-    void setFloatRegDouble(int reg_idx, double val)
-    { actualXC->setFloatRegDouble(reg_idx, val); }
+    void setFloatReg(int reg_idx, FloatReg val)
+    { actualXC->setFloatReg(reg_idx, val); }
 
-    void setFloatRegInt(int reg_idx, uint64_t val)
-    { actualXC->setFloatRegInt(reg_idx, val); }
+    void setFloatRegBits(int reg_idx, FloatRegBits val, int width)
+    { actualXC->setFloatRegBits(reg_idx, val, width); }
+
+    void setFloatRegBits(int reg_idx, FloatRegBits val)
+    { actualXC->setFloatRegBits(reg_idx, val); }
 
     uint64_t readPC() { return actualXC->readPC(); }
 
diff --git a/cpu/o3/alpha_cpu_impl.hh b/cpu/o3/alpha_cpu_impl.hh
index 9f1fa24f6..7c4c2b969 100644
--- a/cpu/o3/alpha_cpu_impl.hh
+++ b/cpu/o3/alpha_cpu_impl.hh
@@ -175,10 +175,8 @@ AlphaFullCPU<Impl>::copyToXC()
     for (int i = 0; i < AlphaISA::NumFloatRegs; ++i)
     {
         renamed_reg = this->renameMap.lookup(i + AlphaISA::FP_Base_DepTag);
-        this->cpuXC->setFloatRegDouble(i,
-            this->regFile.readFloatRegDouble(renamed_reg));
-        this->cpuXC->setFloatRegInt(i,
-            this->regFile.readFloatRegInt(renamed_reg));
+        this->cpuXC->setFloatRegBits(i,
+            this->regFile.readFloatRegBits(renamed_reg));
     }
 
     this->cpuXC->setMiscReg(AlphaISA::Fpcr_DepTag,
@@ -223,10 +221,8 @@ AlphaFullCPU<Impl>::copyFromXC()
     for (int i = 0; i < AlphaISA::NumFloatRegs; ++i)
     {
         renamed_reg = this->renameMap.lookup(i + AlphaISA::FP_Base_DepTag);
-        this->regFile.setFloatRegDouble(renamed_reg,
-                                        this->cpuXC->readFloatRegDouble(i));
-        this->regFile.setFloatRegInt(renamed_reg,
-                                     this->cpuXC->readFloatRegInt(i));
+        this->regFile.setFloatRegBits(renamed_reg,
+                                      this->cpuXC->readFloatRegBits(i));
     }
 
     // Then loop through the misc registers.
diff --git a/cpu/o3/alpha_dyn_inst.hh b/cpu/o3/alpha_dyn_inst.hh
index e7f7d3a57..5b8a05e5c 100644
--- a/cpu/o3/alpha_dyn_inst.hh
+++ b/cpu/o3/alpha_dyn_inst.hh
@@ -152,19 +152,24 @@ class AlphaDynInst : public BaseDynInst<Impl>
         return this->cpu->readIntReg(_srcRegIdx[idx]);
     }
 
-    float readFloatRegSingle(const StaticInst *si, int idx)
+    FloatReg readFloatReg(const StaticInst *si, int idx, int width)
     {
-        return this->cpu->readFloatRegSingle(_srcRegIdx[idx]);
+        return this->cpu->readFloatReg(_srcRegIdx[idx], width);
     }
 
-    double readFloatRegDouble(const StaticInst *si, int idx)
+    FloatReg readFloatReg(const StaticInst *si, int idx)
     {
-        return this->cpu->readFloatRegDouble(_srcRegIdx[idx]);
+        return this->cpu->readFloatReg(_srcRegIdx[idx]);
     }
 
-    uint64_t readFloatRegInt(const StaticInst *si, int idx)
+    FloatRegBits readFloatRegBits(const StaticInst *si, int idx, int width)
     {
-        return this->cpu->readFloatRegInt(_srcRegIdx[idx]);
+        return this->cpu->readFloatRegBits(_srcRegIdx[idx], width);
+    }
+
+    FloatRegBits readFloatRegBits(const StaticInst *si, int idx)
+    {
+        return this->cpu->readFloatRegBits(_srcRegIdx[idx]);
     }
 
     /** @todo: Make results into arrays so they can handle multiple dest
@@ -176,21 +181,28 @@ class AlphaDynInst : public BaseDynInst<Impl>
         this->instResult.integer = val;
     }
 
-    void setFloatRegSingle(const StaticInst *si, int idx, float val)
+    void setFloatReg(const StaticInst *si, int idx, FloatReg val, int width)
     {
-        this->cpu->setFloatRegSingle(_destRegIdx[idx], val);
+        this->cpu->setFloatReg(_destRegIdx[idx], val, width);
         this->instResult.fp = val;
     }
 
-    void setFloatRegDouble(const StaticInst *si, int idx, double val)
+    void setFloatReg(const StaticInst *si, int idx, FloatReg val)
     {
-        this->cpu->setFloatRegDouble(_destRegIdx[idx], val);
+        this->cpu->setFloatReg(_destRegIdx[idx], val);
         this->instResult.dbl = val;
     }
 
-    void setFloatRegInt(const StaticInst *si, int idx, uint64_t val)
+    void setFloatRegBits(const StaticInst *si, int idx,
+            FloatRegBits val, int width)
     {
-        this->cpu->setFloatRegInt(_destRegIdx[idx], val);
+        this->cpu->setFloatRegBits(_destRegIdx[idx], val, width);
+        this->instResult.integer = val;
+    }
+
+    void setFloatRegBits(const StaticInst *si, int idx, FloatRegBits val)
+    {
+        this->cpu->setFloatRegBits(_destRegIdx[idx], val);
         this->instResult.integer = val;
     }
 
diff --git a/cpu/o3/cpu.cc b/cpu/o3/cpu.cc
index 62d68bb33..a268dbc23 100644
--- a/cpu/o3/cpu.cc
+++ b/cpu/o3/cpu.cc
@@ -258,8 +258,7 @@ FullO3CPU<Impl>::init()
         // Then loop through the floating point registers.
         for (int i = 0; i < TheISA::NumFloatRegs; ++i)
         {
-            regFile.floatRegFile[i].d = src_xc->readFloatRegDouble(i);
-            regFile.floatRegFile[i].q = src_xc->readFloatRegInt(i);
+            regFile.floatRegFile.setRegBits(i, src_xc->readRegBits(i))
         }
 /*
         // Then loop through the misc registers.
@@ -348,24 +347,31 @@ FullO3CPU<Impl>::readIntReg(int reg_idx)
 }
 
 template <class Impl>
-float
-FullO3CPU<Impl>::readFloatRegSingle(int reg_idx)
+FloatReg
+FullO3CPU<Impl>::readFloatReg(int reg_idx, int width)
 {
-    return regFile.readFloatRegSingle(reg_idx);
+    return regFile.readFloatReg(reg_idx, width);
 }
 
 template <class Impl>
-double
-FullO3CPU<Impl>::readFloatRegDouble(int reg_idx)
+FloatReg
+FullO3CPU<Impl>::readFloatReg(int reg_idx)
 {
-    return regFile.readFloatRegDouble(reg_idx);
+    return regFile.readFloatReg(reg_idx);
 }
 
 template <class Impl>
-uint64_t
-FullO3CPU<Impl>::readFloatRegInt(int reg_idx)
+FloatRegBits
+FullO3CPU<Impl>::readFloatRegBits(int reg_idx, int width)
 {
-    return regFile.readFloatRegInt(reg_idx);
+    return regFile.readFloatRegBits(reg_idx, width);
+}
+
+template <class Impl>
+FloatRegBits
+FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
+{
+    return regFile.readFloatRegBits(reg_idx);
 }
 
 template <class Impl>
@@ -377,23 +383,30 @@ FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
 
 template <class Impl>
 void
-FullO3CPU<Impl>::setFloatRegSingle(int reg_idx, float val)
+FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val, int width)
 {
-    regFile.setFloatRegSingle(reg_idx, val);
+    regFile.setFloatReg(reg_idx, val, width);
 }
 
 template <class Impl>
 void
-FullO3CPU<Impl>::setFloatRegDouble(int reg_idx, double val)
+FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
 {
-    regFile.setFloatRegDouble(reg_idx, val);
+    regFile.setFloatReg(reg_idx, val);
 }
 
 template <class Impl>
 void
-FullO3CPU<Impl>::setFloatRegInt(int reg_idx, uint64_t val)
+FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val, int width)
 {
-    regFile.setFloatRegInt(reg_idx, val);
+    regFile.setFloatRegBits(reg_idx, val, width);
+}
+
+template <class Impl>
+void
+FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
+{
+    regFile.setFloatRegBits(reg_idx, val);
 }
 
 template <class Impl>
diff --git a/cpu/o3/cpu.hh b/cpu/o3/cpu.hh
index 6577e46e4..f7c80e8a1 100644
--- a/cpu/o3/cpu.hh
+++ b/cpu/o3/cpu.hh
@@ -170,19 +170,23 @@ class FullO3CPU : public BaseFullCPU
     //
     uint64_t readIntReg(int reg_idx);
 
-    float readFloatRegSingle(int reg_idx);
+    FloatReg readFloatReg(int reg_idx);
 
-    double readFloatRegDouble(int reg_idx);
+    FloatReg readFloatReg(int reg_idx, int width);
 
-    uint64_t readFloatRegInt(int reg_idx);
+    FloatRegBits readFloatRegBits(int reg_idx);
+
+    FloatRegBits readFloatRegBits(int reg_idx, int width);
 
     void setIntReg(int reg_idx, uint64_t val);
 
-    void setFloatRegSingle(int reg_idx, float val);
+    void setFloatReg(int reg_idx, FloatReg val, int width);
 
-    void setFloatRegDouble(int reg_idx, double val);
+    void setFloatReg(int reg_idx, FloatReg val, int width);
 
-    void setFloatRegInt(int reg_idx, uint64_t val);
+    void setFloatRegBits(int reg_idx, FloatRegBits val);
+
+    void setFloatRegBits(int reg_idx, FloatRegBits val);
 
     uint64_t readPC();
 
diff --git a/cpu/o3/regfile.hh b/cpu/o3/regfile.hh
index 1e6e10f29..a5cfa8f3c 100644
--- a/cpu/o3/regfile.hh
+++ b/cpu/o3/regfile.hh
@@ -89,43 +89,64 @@ class PhysRegFile
         return intRegFile[reg_idx];
     }
 
-    float readFloatRegSingle(PhysRegIndex reg_idx)
+    FloatReg readFloatReg(PhysRegIndex reg_idx, int width)
     {
         // Remove the base Float reg dependency.
         reg_idx = reg_idx - numPhysicalIntRegs;
 
         assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
 
-        DPRINTF(IEW, "RegFile: Access to float register %i as single, has "
-                "data %8.8f\n", int(reg_idx), (float)floatRegFile[reg_idx].d);
+        FloatReg floatReg = floatRegFile.readReg(reg_idx, width);
 
-        return (float)floatRegFile[reg_idx].d;
+        DPRINTF(IEW, "RegFile: Access to %d byte float register %i, has "
+                "data %8.8d\n", int(reg_idx), (double)floatReg);
+
+        return floatReg;
     }
 
-    double readFloatRegDouble(PhysRegIndex reg_idx)
+    FloatReg readFloatReg(PhysRegIndex reg_idx)
     {
         // Remove the base Float reg dependency.
         reg_idx = reg_idx - numPhysicalIntRegs;
 
         assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
 
-        DPRINTF(IEW, "RegFile: Access to float register %i as double, has "
-                " data %8.8f\n", int(reg_idx), floatRegFile[reg_idx].d);
+        FloatReg floatReg = floatRegFile.readReg(reg_idx);
 
-        return floatRegFile[reg_idx].d;
+        DPRINTF(IEW, "RegFile: Access to float register %i, has "
+                "data %8.8d\n", int(reg_idx), (double)floatReg);
+
+        return floatReg;
     }
 
-    uint64_t readFloatRegInt(PhysRegIndex reg_idx)
+    FloatRegBits readFloatRegBits(PhysRegIndex reg_idx, int width)
     {
         // Remove the base Float reg dependency.
         reg_idx = reg_idx - numPhysicalIntRegs;
 
         assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
 
-        DPRINTF(IEW, "RegFile: Access to float register %i as int, has data "
-                "%lli\n", int(reg_idx), floatRegFile[reg_idx].q);
+        FloatRegBits floatRegBits = floatRegFile.readRegBits(reg_idx, width);
 
-        return floatRegFile[reg_idx].q;
+        DPRINTF(IEW, "RegFile: Access to %d byte float register %i as int, "
+                "has data %lli\n", int(reg_idx), (uint64_t)floatRegBits);
+
+        return floatRegBits;
+    }
+
+    FloatRegBits readFloatRegBits(PhysRegIndex reg_idx)
+    {
+        // Remove the base Float reg dependency.
+        reg_idx = reg_idx - numPhysicalIntRegs;
+
+        assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
+
+        FloatRegBits floatRegBits = floatRegFile.readRegBits(reg_idx);
+
+        DPRINTF(IEW, "RegFile: Access to float register %i as int, "
+                "has data %lli\n", int(reg_idx), (uint64_t)floatRegBits);
+
+        return floatRegBits;
     }
 
     void setIntReg(PhysRegIndex reg_idx, uint64_t val)
@@ -138,33 +159,33 @@ class PhysRegFile
         intRegFile[reg_idx] = val;
     }
 
-    void setFloatRegSingle(PhysRegIndex reg_idx, float val)
+    void setFloatReg(PhysRegIndex reg_idx, FloatReg val, int width)
     {
         // Remove the base Float reg dependency.
         reg_idx = reg_idx - numPhysicalIntRegs;
 
         assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
 
-        DPRINTF(IEW, "RegFile: Setting float register %i to %8.8f\n",
-                int(reg_idx), val);
+        DPRINTF(IEW, "RegFile: Setting float register %i to %8.8d\n",
+                int(reg_idx), (double)val);
 
-        floatRegFile[reg_idx].d = (double)val;
+        floatRegFile.setReg(reg_idx, val, width);
     }
 
-    void setFloatRegDouble(PhysRegIndex reg_idx, double val)
+    void setFloatReg(PhysRegIndex reg_idx, FloatReg val)
     {
         // Remove the base Float reg dependency.
         reg_idx = reg_idx - numPhysicalIntRegs;
 
         assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
 
-        DPRINTF(IEW, "RegFile: Setting float register %i to %8.8f\n",
-                int(reg_idx), val);
+        DPRINTF(IEW, "RegFile: Setting float register %i to %8.8d\n",
+                int(reg_idx), (double)val);
 
-        floatRegFile[reg_idx].d = val;
+        floatRegFile.setReg(reg_idx, val);
     }
 
-    void setFloatRegInt(PhysRegIndex reg_idx, uint64_t val)
+    void setFloatRegBits(PhysRegIndex reg_idx, FloatRegBits val, int width)
     {
         // Remove the base Float reg dependency.
         reg_idx = reg_idx - numPhysicalIntRegs;
@@ -172,9 +193,22 @@ class PhysRegFile
         assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
 
         DPRINTF(IEW, "RegFile: Setting float register %i to %lli\n",
-                int(reg_idx), val);
+                int(reg_idx), (uint64_t)val);
 
-        floatRegFile[reg_idx].q = val;
+        floatRegFile.setRegBits(reg_idx, val, width);
+    }
+
+    void setFloatRegBits(PhysRegIndex reg_idx, FloatRegBits val)
+    {
+        // Remove the base Float reg dependency.
+        reg_idx = reg_idx - numPhysicalIntRegs;
+
+        assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
+
+        DPRINTF(IEW, "RegFile: Setting float register %i to %lli\n",
+                int(reg_idx), (uint64_t)val);
+
+        floatRegFile.setRegBits(reg_idx, val);
     }
 
     uint64_t readPC()
diff --git a/cpu/ozone/cpu.hh b/cpu/ozone/cpu.hh
index f5d84d656..fa849bb09 100644
--- a/cpu/ozone/cpu.hh
+++ b/cpu/ozone/cpu.hh
@@ -406,22 +406,28 @@ class OoOCPU : public BaseCPU
         return xc->readIntReg(si->srcRegIdx(idx));
     }
 
-    float readFloatRegSingle(StaticInst *si, int idx)
+    FloatReg readFloatReg(StaticInst *si, int idx, width)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return xc->readFloatRegSingle(reg_idx);
+        return xc->readFloatReg(reg_idx, width);
     }
 
-    double readFloatRegDouble(StaticInst *si, int idx)
+    FloatReg readFloatReg(StaticInst *si, int idx)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return xc->readFloatRegDouble(reg_idx);
+        return xc->readFloatReg(reg_idx);
     }
 
-    uint64_t readFloatRegInt(StaticInst *si, int idx)
+    FloatRegBits readFloatRegBits(StaticInst *si, int idx, int width)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return xc->readFloatRegInt(reg_idx);
+        return xc->readFloatRegBits(reg_idx, width);
+    }
+
+    FloatRegBits readFloatRegBits(StaticInst *si, int idx)
+    {
+        int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
+        return xc->readFloatRegBits(reg_idx);
     }
 
     void setIntReg(StaticInst *si, int idx, uint64_t val)
@@ -429,22 +435,28 @@ class OoOCPU : public BaseCPU
         xc->setIntReg(si->destRegIdx(idx), val);
     }
 
-    void setFloatRegSingle(StaticInst *si, int idx, float val)
+    void setFloatReg(StaticInst *si, int idx, FloatReg val, int width)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        xc->setFloatRegSingle(reg_idx, val);
+        xc->setFloatReg(reg_idx, val, width);
     }
 
-    void setFloatRegDouble(StaticInst *si, int idx, double val)
+    void setFloatReg(StaticInst *si, int idx, FloatReg val)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        xc->setFloatRegDouble(reg_idx, val);
+        xc->setFloatReg(reg_idx, val);
     }
 
-    void setFloatRegInt(StaticInst *si, int idx, uint64_t val)
+    void setFloatRegBits(StaticInst *si, int idx, FloatRegBits val, int width)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        xc->setFloatRegInt(reg_idx, val);
+        xc->setFloatRegBits(reg_idx, val, width);
+    }
+
+    void setFloatRegBits(StaticInst *si, int idx, FloatRegBits val)
+    {
+        int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
+        xc->setFloatRegBits(reg_idx, val);
     }
 
     uint64_t readPC() { return PC; }
diff --git a/cpu/simple/cpu.cc b/cpu/simple/cpu.cc
index 6e8764709..b335944e9 100644
--- a/cpu/simple/cpu.cc
+++ b/cpu/simple/cpu.cc
@@ -941,7 +941,7 @@ SimpleCPU::tick()
     // maintain $r0 semantics
     cpuXC->setIntReg(ZeroReg, 0);
 #if THE_ISA == ALPHA_ISA
-    cpuXC->setFloatRegDouble(ZeroReg, 0.0);
+    cpuXC->setFloatReg(ZeroReg, 0.0);
 #endif // ALPHA_ISA
 
     if (status() == IcacheAccessComplete) {
diff --git a/cpu/simple/cpu.hh b/cpu/simple/cpu.hh
index 21944a49f..c1cf7ce96 100644
--- a/cpu/simple/cpu.hh
+++ b/cpu/simple/cpu.hh
@@ -80,6 +80,8 @@ class SimpleCPU : public BaseCPU
   protected:
     typedef TheISA::MachInst MachInst;
     typedef TheISA::MiscReg MiscReg;
+    typedef TheISA::FloatReg FloatReg;
+    typedef TheISA::FloatRegBits FloatRegBits;
     class CpuPort : public Port
     {
 
@@ -322,22 +324,28 @@ class SimpleCPU : public BaseCPU
         return cpuXC->readIntReg(si->srcRegIdx(idx));
     }
 
-    float readFloatRegSingle(const StaticInst *si, int idx)
+    FloatReg readFloatReg(const StaticInst *si, int idx, int width)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return cpuXC->readFloatRegSingle(reg_idx);
+        return cpuXC->readFloatReg(reg_idx, width);
     }
 
-    double readFloatRegDouble(const StaticInst *si, int idx)
+    FloatReg readFloatReg(const StaticInst *si, int idx)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return cpuXC->readFloatRegDouble(reg_idx);
+        return cpuXC->readFloatReg(reg_idx);
     }
 
-    uint64_t readFloatRegInt(const StaticInst *si, int idx)
+    FloatRegBits readFloatRegBits(const StaticInst *si, int idx, int width)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return cpuXC->readFloatRegInt(reg_idx);
+        return cpuXC->readFloatRegBits(reg_idx, width);
+    }
+
+    FloatRegBits readFloatRegBits(const StaticInst *si, int idx)
+    {
+        int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
+        return cpuXC->readFloatRegBits(reg_idx);
     }
 
     void setIntReg(const StaticInst *si, int idx, uint64_t val)
@@ -345,22 +353,29 @@ class SimpleCPU : public BaseCPU
         cpuXC->setIntReg(si->destRegIdx(idx), val);
     }
 
-    void setFloatRegSingle(const StaticInst *si, int idx, float val)
+    void setFloatReg(const StaticInst *si, int idx, FloatReg val, int width)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        cpuXC->setFloatRegSingle(reg_idx, val);
+        cpuXC->setFloatReg(reg_idx, val, width);
     }
 
-    void setFloatRegDouble(const StaticInst *si, int idx, double val)
+    void setFloatReg(const StaticInst *si, int idx, FloatReg val)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        cpuXC->setFloatRegDouble(reg_idx, val);
+        cpuXC->setFloatReg(reg_idx, val);
     }
 
-    void setFloatRegInt(const StaticInst *si, int idx, uint64_t val)
+    void setFloatRegBits(const StaticInst *si, int idx,
+            FloatRegBits val, int width)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        cpuXC->setFloatRegInt(reg_idx, val);
+        cpuXC->setFloatRegBits(reg_idx, val, width);
+    }
+
+    void setFloatRegBits(const StaticInst *si, int idx, FloatRegBits val)
+    {
+        int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
+        cpuXC->setFloatRegBits(reg_idx, val);
     }
 
     uint64_t readPC() { return cpuXC->readPC(); }
diff --git a/kern/tru64/tru64.hh b/kern/tru64/tru64.hh
index 68846815e..3f5ef3dea 100644
--- a/kern/tru64/tru64.hh
+++ b/kern/tru64/tru64.hh
@@ -738,7 +738,7 @@ class Tru64 {
 
         for (int i = 0; i < 31; ++i) {
             xc->setIntReg(i, htog(sc->sc_regs[i]));
-            xc->setFloatRegInt(i, htog(sc->sc_fpregs[i]));
+            xc->setFloatRegBits(i, htog(sc->sc_fpregs[i]));
         }
 
         xc->setMiscReg(TheISA::Fpcr_DepTag, htog(sc->sc_fpcr));