8273416: C2: assert(false) failed: bad AD file after JDK-8252372 with UseSSE={0,1}

Reviewed-by: kvn, roland

Author: shipilev

src/hotspot/cpu/x86/x86_32.ad

@@ -7203,6 +7203,7 @@ instruct castLL( eRegL dst ) %{
 %}
 
 instruct castFF( regF dst ) %{
+  predicate(UseSSE >= 2);
   match(Set dst (CastFF dst));
   format %{ "#castFF of $dst" %}
   ins_encode( /*empty encoding*/ );
@@ -7211,6 +7212,25 @@ instruct castFF( regF dst ) %{
 %}
 
 instruct castDD( regD dst ) %{
+  predicate(UseSSE >= 2);
+  match(Set dst (CastDD dst));
+  format %{ "#castDD of $dst" %}
+  ins_encode( /*empty encoding*/ );
+  ins_cost(0);
+  ins_pipe( empty );
+%}
+
+instruct castFF_PR( regFPR dst ) %{
+  predicate(UseSSE < 2);
+  match(Set dst (CastFF dst));
+  format %{ "#castFF of $dst" %}
+  ins_encode( /*empty encoding*/ );
+  ins_cost(0);
+  ins_pipe( empty );
+%}
+
+instruct castDD_PR( regDPR dst ) %{
+  predicate(UseSSE < 2);
   match(Set dst (CastDD dst));
   format %{ "#castDD of $dst" %}
   ins_encode( /*empty encoding*/ );

src/hotspot/share/opto/castnode.hpp

@@ -140,7 +140,7 @@ class CastFFNode: public ConstraintCastNode {
     init_class_id(Class_CastFF);
   }
   virtual int Opcode() const;
-  virtual uint ideal_reg() const { return Op_RegF; }
+  virtual uint ideal_reg() const { return in(1)->ideal_reg(); }
 };
 
 class CastDDNode: public ConstraintCastNode {
@@ -150,7 +150,7 @@ class CastDDNode: public ConstraintCastNode {
     init_class_id(Class_CastDD);
   }
   virtual int Opcode() const;
-  virtual uint ideal_reg() const { return Op_RegD; }
+  virtual uint ideal_reg() const { return in(1)->ideal_reg(); }
 };
 
 class CastVVNode: public ConstraintCastNode {