src/cpu/x86/vm/x86_64.ad

rev 10974 : 8155729: C2: Skip transformation of LoadConP for heap-based compressed oops
Reviewed-by:

*** 1663,1672 ****
--- 1663,1682 ----
  bool Matcher::narrow_klass_use_complex_address() {
    assert(UseCompressedClassPointers, "only for compressed klass code");
    return (LogKlassAlignmentInBytes <= 3);
  }
  
+ bool Matcher::const_oop_prefer_decode() {
+   // Prefer ConN+DecodeN over ConP.
+   return true;
+ }
+ 
+ bool Matcher::const_klass_prefer_decode() {
+   // Prefer ConNKlass+DecodeNKlass over ConP in simple compressed klass mode.
+   return Universe::narrow_klass_base() == NULL;
+ }
+ 
  // Is it better to copy float constants, or load them directly from
  // memory?  Intel can load a float constant from a direct address,
  // requiring no extra registers.  Most RISCs will have to materialize
  // an address into a register first, so they would do better to copy
  // the constant from stack.