src/cpu/x86/vm/stubGenerator_x86_64.cpp

*** 1249,1258 ****
--- 1249,1259 ----
          ShouldNotReachHere();
  
      }
    }
  
+ 
    // Copy big chunks forward
    //
    // Inputs:
    //   end_from     - source arrays end address
    //   end_to       - destination array end address
*** 1266,1283 ****
--- 1267,1293 ----
                               Label& L_copy_32_bytes, Label& L_copy_8_bytes) {
      DEBUG_ONLY(__ stop("enter at entry label, not here"));
      Label L_loop;
      __ align(16);
    __ BIND(L_loop);
+     if(UseUnalignedLoadStores) {
+     __ movdqu(xmm0, Address(end_from, qword_count, Address::times_8, -24));
+     __ movdqu(Address(end_to, qword_count, Address::times_8, -24), xmm0);
+     __ movdqu(xmm1, Address(end_from, qword_count, Address::times_8, - 8));
+     __ movdqu(Address(end_to, qword_count, Address::times_8, - 8), xmm1);
+ 
+     } else {
      __ movq(to, Address(end_from, qword_count, Address::times_8, -24));
      __ movq(Address(end_to, qword_count, Address::times_8, -24), to);
      __ movq(to, Address(end_from, qword_count, Address::times_8, -16));
      __ movq(Address(end_to, qword_count, Address::times_8, -16), to);
      __ movq(to, Address(end_from, qword_count, Address::times_8, - 8));
      __ movq(Address(end_to, qword_count, Address::times_8, - 8), to);
      __ movq(to, Address(end_from, qword_count, Address::times_8, - 0));
      __ movq(Address(end_to, qword_count, Address::times_8, - 0), to);
+ 
+     }
    __ BIND(L_copy_32_bytes);
      __ addptr(qword_count, 4);
      __ jcc(Assembler::lessEqual, L_loop);
      __ subptr(qword_count, 4);
      __ jcc(Assembler::less, L_copy_8_bytes); // Copy trailing qwords
*** 1299,1316 ****
--- 1309,1335 ----
                                Label& L_copy_32_bytes, Label& L_copy_8_bytes) {
      DEBUG_ONLY(__ stop("enter at entry label, not here"));
      Label L_loop;
      __ align(16);
    __ BIND(L_loop);
+     if(UseUnalignedLoadStores) {
+     __ movdqu(xmm0, Address(from, qword_count, Address::times_8, 16));
+     __ movdqu(Address(dest, qword_count, Address::times_8, 16), xmm0);
+     __ movdqu(xmm1, Address(from, qword_count, Address::times_8,  0));
+     __ movdqu(Address(dest, qword_count, Address::times_8,  0), xmm1);
+ 
+     } else {
      __ movq(to, Address(from, qword_count, Address::times_8, 24));
      __ movq(Address(dest, qword_count, Address::times_8, 24), to);
      __ movq(to, Address(from, qword_count, Address::times_8, 16));
      __ movq(Address(dest, qword_count, Address::times_8, 16), to);
      __ movq(to, Address(from, qword_count, Address::times_8,  8));
      __ movq(Address(dest, qword_count, Address::times_8,  8), to);
      __ movq(to, Address(from, qword_count, Address::times_8,  0));
      __ movq(Address(dest, qword_count, Address::times_8,  0), to);
+ 
+     }
    __ BIND(L_copy_32_bytes);
      __ subptr(qword_count, 4);
      __ jcc(Assembler::greaterEqual, L_loop);
      __ addptr(qword_count, 4);
      __ jcc(Assembler::greater, L_copy_8_bytes); // Copy trailing qwords