Added code to support correct saving of %ccr across calls
llvm-svn: 1111
diff --git a/llvm/lib/Target/Sparc/SparcRegClassInfo.h b/llvm/lib/Target/Sparc/SparcRegClassInfo.h
index 4f91268..fd76815 100644
--- a/llvm/lib/Target/Sparc/SparcRegClassInfo.h
+++ b/llvm/lib/Target/Sparc/SparcRegClassInfo.h
@@ -191,22 +191,54 @@
//-----------------------------------------------------------------------------
// Int CC Register Class
-// Only one integer cc register is available
+// Only one integer cc register is available. However, this register is
+// referred to as %xcc when instructions like subcc are executed but
+// referred to as %ccr (i.e., %xcc + %icc") when this register is moved
+// into an integer register using RD or WR instrcutions. So, two ids are
+// allocated for two names.
//-----------------------------------------------------------------------------
+static string const IntCCRegNames[] =
+ {
+ "xcc", "ccr"
+ };
+
+
+class SparcIntCCRegOrder{
+
+ public:
+
+ enum RegsInPrefOrder {
+
+ xcc, ccr // only one is available - see the note above
+ };
+
+ static const string getRegName(const unsigned reg) {
+ assert( reg < 2 );
+ return IntCCRegNames[reg];
+ }
+
+ // according to Sparc 64 ABI, %ccr is volatile
+ inline bool isRegVolatile(const int Reg) const { return true; }
+
+
+};
+
+
+
class SparcIntCCRegClass : public MachineRegClassInfo
{
public:
SparcIntCCRegClass(unsigned ID)
- : MachineRegClassInfo(ID,1, 1) { }
+ : MachineRegClassInfo(ID, 1, 2) { }
inline void colorIGNode(IGNode * Node, bool IsColorUsedArr[] ) const {
Node->setColor(0); // only one int cc reg is available
}
- // *** TODO: Check this
+
inline bool isRegVolatile(const int Reg) const { return true; }
};