1554 FLAG_SET_DEFAULT(UseFastStosb, false);
1555 }
1556
1557 // For AMD Processors use XMM/YMM MOVDQU instructions
1558 // for Object Initialization as default
1559 if (is_amd() && cpu_family() >= 0x19) {
1560 if (FLAG_IS_DEFAULT(UseFastStosb)) {
1561 UseFastStosb = false;
1562 }
1563 }
1564
1565 #ifdef COMPILER2
1566 if (is_intel() && MaxVectorSize > 16) {
1567 if (FLAG_IS_DEFAULT(UseFastStosb)) {
1568 UseFastStosb = false;
1569 }
1570 }
1571 #endif
1572
1573 // Use XMM/YMM MOVDQU instruction for Object Initialization
1574 if (!UseFastStosb && UseSSE >= 2 && UseUnalignedLoadStores) {
1575 if (FLAG_IS_DEFAULT(UseXMMForObjInit)) {
1576 UseXMMForObjInit = true;
1577 }
1578 } else if (UseXMMForObjInit) {
1579 warning("UseXMMForObjInit requires SSE2 and unaligned load/stores. Feature is switched off.");
1580 FLAG_SET_DEFAULT(UseXMMForObjInit, false);
1581 }
1582
1583 #ifdef COMPILER2
1584 if (FLAG_IS_DEFAULT(AlignVector)) {
1585 // Modern processors allow misaligned memory operations for vectors.
1586 AlignVector = !UseUnalignedLoadStores;
1587 }
1588 if (FLAG_IS_DEFAULT(OptimizeFill)) {
1589 // 8247307: On x86, the auto-vectorized loop array fill code shows
1590 // better performance than the array fill stubs. We should reenable
1591 // this after the x86 stubs get improved.
1592 OptimizeFill = false;
1593 }
1594 #endif // COMPILER2
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1554 FLAG_SET_DEFAULT(UseFastStosb, false);
1555 }
1556
1557 // For AMD Processors use XMM/YMM MOVDQU instructions
1558 // for Object Initialization as default
1559 if (is_amd() && cpu_family() >= 0x19) {
1560 if (FLAG_IS_DEFAULT(UseFastStosb)) {
1561 UseFastStosb = false;
1562 }
1563 }
1564
1565 #ifdef COMPILER2
1566 if (is_intel() && MaxVectorSize > 16) {
1567 if (FLAG_IS_DEFAULT(UseFastStosb)) {
1568 UseFastStosb = false;
1569 }
1570 }
1571 #endif
1572
1573 // Use XMM/YMM MOVDQU instruction for Object Initialization
1574 if (UseSSE >= 2 && UseUnalignedLoadStores) {
1575 if (FLAG_IS_DEFAULT(UseXMMForObjInit)) {
1576 UseXMMForObjInit = true;
1577 }
1578 } else if (UseXMMForObjInit) {
1579 warning("UseXMMForObjInit requires SSE2 and unaligned load/stores. Feature is switched off.");
1580 FLAG_SET_DEFAULT(UseXMMForObjInit, false);
1581 }
1582
1583 #ifdef COMPILER2
1584 if (FLAG_IS_DEFAULT(AlignVector)) {
1585 // Modern processors allow misaligned memory operations for vectors.
1586 AlignVector = !UseUnalignedLoadStores;
1587 }
1588 if (FLAG_IS_DEFAULT(OptimizeFill)) {
1589 // 8247307: On x86, the auto-vectorized loop array fill code shows
1590 // better performance than the array fill stubs. We should reenable
1591 // this after the x86 stubs get improved.
1592 OptimizeFill = false;
1593 }
1594 #endif // COMPILER2
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