src/hotspot/cpu/x86/macroAssembler_x86.cpp

*** 10944,10953 ****
--- 10944,10991 ----
    jcc(Assembler::notZero, copy_chars_loop);
  
    bind(done);
  }
  
+ void MacroAssembler::cache_wb(Address line)
+ {
+   // 64 bit cpus always support clflush
+   assert(VM_Version::supports_clflush(), "should not reach here on 32-bit");
+   bool optimized = VM_Version::supports_clflushopt();
+   bool no_evict = VM_Version::supports_clwb();
+ 
+   // pick the correct implementation
+ 
+   if (optimized) {
+     if (no_evict) {
+       clwb(line);
+     } else {
+       clflushopt(line);
+     }
+   } else {
+     // no need for fence when using CLFLUSH
+     clflush(line);
+   }    
+ }
+ 
+ 
+ void MacroAssembler::cache_wbsync(bool is_pre)
+ {
+   assert(VM_Version::supports_clflush(), "should not reach here on 32-bit");
+   bool optimized = VM_Version::supports_clflushopt();
+   bool no_evict = VM_Version::supports_clwb();
+ 
+   // pick the correct implementation
+ 
+   if (!is_pre && (optimized || no_evict)) {
+     // need an sfence for post flush when using clflushopt or clwb
+     // otherwise no no need for any synchroniaztion
+ 
+     sfence();
+   }
+ }
+ 
  Assembler::Condition MacroAssembler::negate_condition(Assembler::Condition cond) {
    switch (cond) {
      // Note some conditions are synonyms for others
      case Assembler::zero:         return Assembler::notZero;
      case Assembler::notZero:      return Assembler::zero;