cpu: add a condition-code register class

Add a third register class for condition codes,
in parallel with the integer and FP classes.
No ISAs use the CC class at this point though.

3 files changed, 16 insertions, 1 deletions

diff --git a/src/arch/alpha/isa.hh b/src/arch/alpha/isa.hh
index e2e2daba8..d30499066 100644
--- a/src/arch/alpha/isa.hh
+++ b/src/arch/alpha/isa.hh
@@ -103,6 +103,13 @@ namespace AlphaISA
             return reg;
         }
 
+        // dummy
+        int
+        flattenCCIndex(int reg)
+        {
+            return reg;
+        }
+
         const Params *params() const;
 
         ISA(Params *p);
diff --git a/src/arch/alpha/registers.hh b/src/arch/alpha/registers.hh
index 92ba22ee8..3fd774cf7 100644
--- a/src/arch/alpha/registers.hh
+++ b/src/arch/alpha/registers.hh
@@ -53,6 +53,9 @@ typedef uint64_t FloatRegBits;
 // control register file contents
 typedef uint64_t MiscReg;
 
+// dummy typedef since we don't have CC regs
+typedef uint8_t CCReg;
+
 union AnyReg
 {
     IntReg  intreg;
@@ -91,6 +94,7 @@ const int NumFloatArchRegs = 32;
 
 const int NumIntRegs = NumIntArchRegs + NumPALShadowRegs;
 const int NumFloatRegs = NumFloatArchRegs;
+const int NumCCRegs = 0;
 const int NumMiscRegs = NUM_MISCREGS;
 
 const int TotalNumRegs =
@@ -101,7 +105,8 @@ enum DependenceTags {
     // 0..31 are the integer regs 0..31
     // 32..63 are the FP regs 0..31, i.e. use (reg + FP_Reg_Base)
     FP_Reg_Base = NumIntRegs,
-    Misc_Reg_Base = FP_Reg_Base + NumFloatRegs,
+    CC_Reg_Base = FP_Reg_Base + NumFloatRegs,
+    Misc_Reg_Base = CC_Reg_Base + NumCCRegs, // NumCCRegs == 0
     Max_Reg_Index = Misc_Reg_Base + NumMiscRegs + NumInternalProcRegs
 };
 
diff --git a/src/arch/alpha/utility.cc b/src/arch/alpha/utility.cc
index 32fc0b141..2dfe00f96 100644
--- a/src/arch/alpha/utility.cc
+++ b/src/arch/alpha/utility.cc
@@ -71,6 +71,9 @@ copyRegs(ThreadContext *src, ThreadContext *dest)
     for (int i = 0; i < NumFloatRegs; ++i)
         dest->setFloatRegBits(i, src->readFloatRegBits(i));
 
+    // Would need to add condition-code regs if implemented
+    assert(NumCCRegs == 0);
+
     // Copy misc. registers
     copyMiscRegs(src, dest);