r600/sfn: Add a type for address registers

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21347>

src/gallium/drivers/r600/sfn/sfn_valuefactory.cpp

@@ -648,15 +648,23 @@ split_register_string(const string& s,
 PRegister
 ValueFactory::dest_from_string(const std::string& s)
 {
-   assert(s.length() >= 4);
-
-   assert(strchr("ARS_", s[0]));
+   if (s == "AR") {
+      return new AddressRegister(AddressRegister::addr);
+   } else if (s == "IDX0") {
+      return new AddressRegister(AddressRegister::idx0);
+   } else if (s == "IDX1") {
+      return new AddressRegister(AddressRegister::idx1);
+   }
 
    string index_str;
    string size_str;
    string swizzle_str;
    string pin_str;
 
+   assert(s.length() >= 4);
+
+   assert(strchr("ARS_", s[0]));
+
    split_register_string(s, index_str, size_str, swizzle_str, pin_str);
 
    int sel = 0;

src/gallium/drivers/r600/sfn/sfn_virtualvalues.cpp

@@ -263,6 +263,17 @@ Register::accept(ConstRegisterVisitor& visitor) const
 void
 Register::print(std::ostream& os) const
 {
+   if (m_flags.test(addr_or_idx)) {
+      switch (sel()) {
+      case AddressRegister::addr: os << "AR"; break;
+      case AddressRegister::idx0: os << "IDX0"; break;
+      case AddressRegister::idx1: os << "IDX1"; break;
+      default:
+         unreachable("Wrong address ID");
+      }
+      return;
+   }
+
    os << (m_flags.test(ssa) ? "S" : "R") << sel() << "." << chanchar[chan()];
 
    if (pin() != pin_none)
@@ -286,6 +297,14 @@ Register::from_string(const std::string& s)
    char chan = 0;
    std::string pinstr;
 
+   if (s == "AR") {
+      return new AddressRegister(AddressRegister::addr);
+   } else if (s == "IDX0") {
+      return new AddressRegister(AddressRegister::idx0);
+   } else if (s == "IDX1") {
+      return new AddressRegister(AddressRegister::idx1);
+   }
+
    assert(s[0] == 'R' || s[0] == '_' || s[0] == 'S');
 
    int type = 0;

src/gallium/drivers/r600/sfn/sfn_virtualvalues.h

@@ -163,6 +163,7 @@ public:
       ssa,
       pin_start,
       pin_end,
+      addr_or_idx,
       flag_count
    };
 
@@ -223,6 +224,24 @@ private:
 };
 using PRegister = Register::Pointer;
 
+class AddressRegister : public Register {
+public:
+   enum Type {
+      addr,
+      idx0 = 2,
+      idx1 = 3
+   };
+   AddressRegister(Type type) :  Register(type, 0, pin_fully) {
+      set_flag(addr_or_idx);
+   }
+   Register *as_register() override { return nullptr; }
+
+protected:
+   void do_set_chan(UNUSED int c) { unreachable("Address registers must have chan 0");}
+   void set_sel_internal(UNUSED int sel) {unreachable("Address registers don't support sel override");}
+};
+
+
 inline std::ostream&
 operator<<(std::ostream& os, const Register& val)
 {