677 FLAG_SET_DEFAULT(UseAVX, 2); //Set UseAVX=2 for Skylake
678 }
679 } else if (UseAVX > use_avx_limit) {
680 warning("UseAVX=%d is not supported on this CPU, setting it to UseAVX=%d", (int) UseAVX, use_avx_limit);
681 FLAG_SET_DEFAULT(UseAVX, use_avx_limit);
682 } else if (UseAVX < 0) {
683 warning("UseAVX=%d is not valid, setting it to UseAVX=0", (int) UseAVX);
684 FLAG_SET_DEFAULT(UseAVX, 0);
685 }
686
687 if (UseAVX < 3) {
688 _features &= ~CPU_AVX512F;
689 _features &= ~CPU_AVX512DQ;
690 _features &= ~CPU_AVX512CD;
691 _features &= ~CPU_AVX512BW;
692 _features &= ~CPU_AVX512VL;
693 _features &= ~CPU_AVX512_VPOPCNTDQ;
694 _features &= ~CPU_AVX512_VPCLMULQDQ;
695 _features &= ~CPU_VAES;
696 _features &= ~CPU_VNNI;
697 }
698
699 if (UseAVX < 2)
700 _features &= ~CPU_AVX2;
701
702 if (UseAVX < 1) {
703 _features &= ~CPU_AVX;
704 _features &= ~CPU_VZEROUPPER;
705 }
706
707 if (logical_processors_per_package() == 1) {
708 // HT processor could be installed on a system which doesn't support HT.
709 _features &= ~CPU_HT;
710 }
711
712 if (is_intel()) { // Intel cpus specific settings
713 if (is_knights_family()) {
714 _features &= ~CPU_VZEROUPPER;
715 }
716 }
717
718 char buf[256];
719 jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
720 cores_per_cpu(), threads_per_core(),
721 cpu_family(), _model, _stepping,
722 (supports_cmov() ? ", cmov" : ""),
723 (supports_cmpxchg8() ? ", cx8" : ""),
724 (supports_fxsr() ? ", fxsr" : ""),
725 (supports_mmx() ? ", mmx" : ""),
726 (supports_sse() ? ", sse" : ""),
727 (supports_sse2() ? ", sse2" : ""),
728 (supports_sse3() ? ", sse3" : ""),
729 (supports_ssse3()? ", ssse3": ""),
730 (supports_sse4_1() ? ", sse4.1" : ""),
731 (supports_sse4_2() ? ", sse4.2" : ""),
732 (supports_popcnt() ? ", popcnt" : ""),
733 (supports_avx() ? ", avx" : ""),
734 (supports_avx2() ? ", avx2" : ""),
735 (supports_aes() ? ", aes" : ""),
736 (supports_clmul() ? ", clmul" : ""),
737 (supports_erms() ? ", erms" : ""),
738 (supports_rtm() ? ", rtm" : ""),
739 (supports_mmx_ext() ? ", mmxext" : ""),
740 (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
741 (supports_lzcnt() ? ", lzcnt": ""),
742 (supports_sse4a() ? ", sse4a": ""),
743 (supports_ht() ? ", ht": ""),
744 (supports_tsc() ? ", tsc": ""),
745 (supports_tscinv_bit() ? ", tscinvbit": ""),
746 (supports_tscinv() ? ", tscinv": ""),
747 (supports_bmi1() ? ", bmi1" : ""),
748 (supports_bmi2() ? ", bmi2" : ""),
749 (supports_adx() ? ", adx" : ""),
750 (supports_evex() ? ", evex" : ""),
751 (supports_sha() ? ", sha" : ""),
752 (supports_fma() ? ", fma" : ""));
753 _features_string = os::strdup(buf);
754
755 // UseSSE is set to the smaller of what hardware supports and what
756 // the command line requires. I.e., you cannot set UseSSE to 2 on
757 // older Pentiums which do not support it.
758 int use_sse_limit = 0;
759 if (UseSSE > 0) {
760 if (UseSSE > 3 && supports_sse4_1()) {
761 use_sse_limit = 4;
762 } else if (UseSSE > 2 && supports_sse3()) {
763 use_sse_limit = 3;
764 } else if (UseSSE > 1 && supports_sse2()) {
765 use_sse_limit = 2;
766 } else if (UseSSE > 0 && supports_sse()) {
767 use_sse_limit = 1;
768 } else {
769 use_sse_limit = 0;
770 }
771 }
772 if (FLAG_IS_DEFAULT(UseSSE)) {
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677 FLAG_SET_DEFAULT(UseAVX, 2); //Set UseAVX=2 for Skylake
678 }
679 } else if (UseAVX > use_avx_limit) {
680 warning("UseAVX=%d is not supported on this CPU, setting it to UseAVX=%d", (int) UseAVX, use_avx_limit);
681 FLAG_SET_DEFAULT(UseAVX, use_avx_limit);
682 } else if (UseAVX < 0) {
683 warning("UseAVX=%d is not valid, setting it to UseAVX=0", (int) UseAVX);
684 FLAG_SET_DEFAULT(UseAVX, 0);
685 }
686
687 if (UseAVX < 3) {
688 _features &= ~CPU_AVX512F;
689 _features &= ~CPU_AVX512DQ;
690 _features &= ~CPU_AVX512CD;
691 _features &= ~CPU_AVX512BW;
692 _features &= ~CPU_AVX512VL;
693 _features &= ~CPU_AVX512_VPOPCNTDQ;
694 _features &= ~CPU_AVX512_VPCLMULQDQ;
695 _features &= ~CPU_VAES;
696 _features &= ~CPU_VNNI;
697 _features &= ~CPU_VBMI2;
698 }
699
700 if (UseAVX < 2)
701 _features &= ~CPU_AVX2;
702
703 if (UseAVX < 1) {
704 _features &= ~CPU_AVX;
705 _features &= ~CPU_VZEROUPPER;
706 }
707
708 if (logical_processors_per_package() == 1) {
709 // HT processor could be installed on a system which doesn't support HT.
710 _features &= ~CPU_HT;
711 }
712
713 if (is_intel()) { // Intel cpus specific settings
714 if (is_knights_family()) {
715 _features &= ~CPU_VZEROUPPER;
716 }
717 }
718
719 char buf[256];
720 jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
721 cores_per_cpu(), threads_per_core(),
722 cpu_family(), _model, _stepping,
723 (supports_cmov() ? ", cmov" : ""),
724 (supports_cmpxchg8() ? ", cx8" : ""),
725 (supports_fxsr() ? ", fxsr" : ""),
726 (supports_mmx() ? ", mmx" : ""),
727 (supports_sse() ? ", sse" : ""),
728 (supports_sse2() ? ", sse2" : ""),
729 (supports_sse3() ? ", sse3" : ""),
730 (supports_ssse3()? ", ssse3": ""),
731 (supports_sse4_1() ? ", sse4.1" : ""),
732 (supports_sse4_2() ? ", sse4.2" : ""),
733 (supports_popcnt() ? ", popcnt" : ""),
734 (supports_avx() ? ", avx" : ""),
735 (supports_avx2() ? ", avx2" : ""),
736 (supports_aes() ? ", aes" : ""),
737 (supports_clmul() ? ", clmul" : ""),
738 (supports_erms() ? ", erms" : ""),
739 (supports_rtm() ? ", rtm" : ""),
740 (supports_mmx_ext() ? ", mmxext" : ""),
741 (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
742 (supports_lzcnt() ? ", lzcnt": ""),
743 (supports_sse4a() ? ", sse4a": ""),
744 (supports_ht() ? ", ht": ""),
745 (supports_tsc() ? ", tsc": ""),
746 (supports_tscinv_bit() ? ", tscinvbit": ""),
747 (supports_tscinv() ? ", tscinv": ""),
748 (supports_bmi1() ? ", bmi1" : ""),
749 (supports_bmi2() ? ", bmi2" : ""),
750 (supports_adx() ? ", adx" : ""),
751 (supports_evex() ? ", evex" : ""),
752 (supports_sha() ? ", sha" : ""),
753 (supports_fma() ? ", fma" : ""),
754 (supports_vbmi2() ? ", vbmi2" : ""),
755 (supports_vaes() ? ", vaes" : ""),
756 (supports_vnni() ? ", vnni" : ""));
757 _features_string = os::strdup(buf);
758
759 // UseSSE is set to the smaller of what hardware supports and what
760 // the command line requires. I.e., you cannot set UseSSE to 2 on
761 // older Pentiums which do not support it.
762 int use_sse_limit = 0;
763 if (UseSSE > 0) {
764 if (UseSSE > 3 && supports_sse4_1()) {
765 use_sse_limit = 4;
766 } else if (UseSSE > 2 && supports_sse3()) {
767 use_sse_limit = 3;
768 } else if (UseSSE > 1 && supports_sse2()) {
769 use_sse_limit = 2;
770 } else if (UseSSE > 0 && supports_sse()) {
771 use_sse_limit = 1;
772 } else {
773 use_sse_limit = 0;
774 }
775 }
776 if (FLAG_IS_DEFAULT(UseSSE)) {
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