561 _features &= ~CPU_AVX512CD;
562 _features &= ~CPU_AVX512BW;
563 _features &= ~CPU_AVX512VL;
564 }
565
566 if (UseAVX < 2)
567 _features &= ~CPU_AVX2;
568
569 if (UseAVX < 1)
570 _features &= ~CPU_AVX;
571
572 if (!UseAES && !FLAG_IS_DEFAULT(UseAES))
573 _features &= ~CPU_AES;
574
575 if (logical_processors_per_package() == 1) {
576 // HT processor could be installed on a system which doesn't support HT.
577 _features &= ~CPU_HT;
578 }
579
580 char buf[256];
581 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",
582 cores_per_cpu(), threads_per_core(),
583 cpu_family(), _model, _stepping,
584 (supports_cmov() ? ", cmov" : ""),
585 (supports_cmpxchg8() ? ", cx8" : ""),
586 (supports_fxsr() ? ", fxsr" : ""),
587 (supports_mmx() ? ", mmx" : ""),
588 (supports_sse() ? ", sse" : ""),
589 (supports_sse2() ? ", sse2" : ""),
590 (supports_sse3() ? ", sse3" : ""),
591 (supports_ssse3()? ", ssse3": ""),
592 (supports_sse4_1() ? ", sse4.1" : ""),
593 (supports_sse4_2() ? ", sse4.2" : ""),
594 (supports_popcnt() ? ", popcnt" : ""),
595 (supports_avx() ? ", avx" : ""),
596 (supports_avx2() ? ", avx2" : ""),
597 (supports_aes() ? ", aes" : ""),
598 (supports_clmul() ? ", clmul" : ""),
599 (supports_erms() ? ", erms" : ""),
600 (supports_rtm() ? ", rtm" : ""),
601 (supports_mmx_ext() ? ", mmxext" : ""),
602 (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
603 (supports_lzcnt() ? ", lzcnt": ""),
604 (supports_sse4a() ? ", sse4a": ""),
605 (supports_ht() ? ", ht": ""),
606 (supports_tsc() ? ", tsc": ""),
607 (supports_tscinv_bit() ? ", tscinvbit": ""),
608 (supports_tscinv() ? ", tscinv": ""),
609 (supports_bmi1() ? ", bmi1" : ""),
610 (supports_bmi2() ? ", bmi2" : ""),
611 (supports_adx() ? ", adx" : ""),
612 (supports_evex() ? ", evex" : ""),
613 (supports_sha() ? ", sha" : ""));
614 _features_string = os::strdup(buf);
615
616 // UseSSE is set to the smaller of what hardware supports and what
617 // the command line requires. I.e., you cannot set UseSSE to 2 on
618 // older Pentiums which do not support it.
619 if (UseSSE > 4) UseSSE=4;
620 if (UseSSE < 0) UseSSE=0;
621 if (!supports_sse4_1()) // Drop to 3 if no SSE4 support
622 UseSSE = MIN2((intx)3,UseSSE);
623 if (!supports_sse3()) // Drop to 2 if no SSE3 support
624 UseSSE = MIN2((intx)2,UseSSE);
625 if (!supports_sse2()) // Drop to 1 if no SSE2 support
626 UseSSE = MIN2((intx)1,UseSSE);
627 if (!supports_sse ()) // Drop to 0 if no SSE support
628 UseSSE = 0;
629
630 // Use AES instructions if available.
631 if (supports_aes()) {
632 if (FLAG_IS_DEFAULT(UseAES)) {
633 FLAG_SET_DEFAULT(UseAES, true);
755 FLAG_SET_DEFAULT(UseSHA256Intrinsics, true);
756 }
757 } else if (UseSHA256Intrinsics) {
758 warning("Intrinsics for SHA-224 and SHA-256 crypto hash functions not available on this CPU.");
759 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);
760 }
761
762 if (UseSHA512Intrinsics) {
763 warning("Intrinsics for SHA-384 and SHA-512 crypto hash functions not available on this CPU.");
764 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);
765 }
766
767 if (!(UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics)) {
768 FLAG_SET_DEFAULT(UseSHA, false);
769 }
770
771 if (UseAdler32Intrinsics) {
772 warning("Adler32Intrinsics not available on this CPU.");
773 FLAG_SET_DEFAULT(UseAdler32Intrinsics, false);
774 }
775
776 // Adjust RTM (Restricted Transactional Memory) flags
777 if (!supports_rtm() && UseRTMLocking) {
778 // Can't continue because UseRTMLocking affects UseBiasedLocking flag
779 // setting during arguments processing. See use_biased_locking().
780 // VM_Version_init() is executed after UseBiasedLocking is used
781 // in Thread::allocate().
782 vm_exit_during_initialization("RTM instructions are not available on this CPU");
783 }
784
785 #if INCLUDE_RTM_OPT
786 if (UseRTMLocking) {
787 if (is_intel_family_core()) {
788 if ((_model == CPU_MODEL_HASWELL_E3) ||
789 (_model == CPU_MODEL_HASWELL_E7 && _stepping < 3) ||
790 (_model == CPU_MODEL_BROADWELL && _stepping < 4)) {
791 // currently a collision between SKL and HSW_E3
792 if (!UnlockExperimentalVMOptions && UseAVX < 3) {
793 vm_exit_during_initialization("UseRTMLocking is only available as experimental option on this platform. It must be enabled via -XX:+UnlockExperimentalVMOptions flag.");
794 } else {
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561 _features &= ~CPU_AVX512CD;
562 _features &= ~CPU_AVX512BW;
563 _features &= ~CPU_AVX512VL;
564 }
565
566 if (UseAVX < 2)
567 _features &= ~CPU_AVX2;
568
569 if (UseAVX < 1)
570 _features &= ~CPU_AVX;
571
572 if (!UseAES && !FLAG_IS_DEFAULT(UseAES))
573 _features &= ~CPU_AES;
574
575 if (logical_processors_per_package() == 1) {
576 // HT processor could be installed on a system which doesn't support HT.
577 _features &= ~CPU_HT;
578 }
579
580 char buf[256];
581 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",
582 cores_per_cpu(), threads_per_core(),
583 cpu_family(), _model, _stepping,
584 (supports_cmov() ? ", cmov" : ""),
585 (supports_cmpxchg8() ? ", cx8" : ""),
586 (supports_fxsr() ? ", fxsr" : ""),
587 (supports_mmx() ? ", mmx" : ""),
588 (supports_sse() ? ", sse" : ""),
589 (supports_sse2() ? ", sse2" : ""),
590 (supports_sse3() ? ", sse3" : ""),
591 (supports_ssse3()? ", ssse3": ""),
592 (supports_sse4_1() ? ", sse4.1" : ""),
593 (supports_sse4_2() ? ", sse4.2" : ""),
594 (supports_popcnt() ? ", popcnt" : ""),
595 (supports_avx() ? ", avx" : ""),
596 (supports_avx2() ? ", avx2" : ""),
597 (supports_aes() ? ", aes" : ""),
598 (supports_clmul() ? ", clmul" : ""),
599 (supports_erms() ? ", erms" : ""),
600 (supports_rtm() ? ", rtm" : ""),
601 (supports_mmx_ext() ? ", mmxext" : ""),
602 (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
603 (supports_lzcnt() ? ", lzcnt": ""),
604 (supports_sse4a() ? ", sse4a": ""),
605 (supports_ht() ? ", ht": ""),
606 (supports_tsc() ? ", tsc": ""),
607 (supports_tscinv_bit() ? ", tscinvbit": ""),
608 (supports_tscinv() ? ", tscinv": ""),
609 (supports_bmi1() ? ", bmi1" : ""),
610 (supports_bmi2() ? ", bmi2" : ""),
611 (supports_adx() ? ", adx" : ""),
612 (supports_evex() ? ", evex" : ""),
613 (supports_sha() ? ", sha" : ""),
614 (supports_fma() ? ", fma" : ""));
615 _features_string = os::strdup(buf);
616
617 // UseSSE is set to the smaller of what hardware supports and what
618 // the command line requires. I.e., you cannot set UseSSE to 2 on
619 // older Pentiums which do not support it.
620 if (UseSSE > 4) UseSSE=4;
621 if (UseSSE < 0) UseSSE=0;
622 if (!supports_sse4_1()) // Drop to 3 if no SSE4 support
623 UseSSE = MIN2((intx)3,UseSSE);
624 if (!supports_sse3()) // Drop to 2 if no SSE3 support
625 UseSSE = MIN2((intx)2,UseSSE);
626 if (!supports_sse2()) // Drop to 1 if no SSE2 support
627 UseSSE = MIN2((intx)1,UseSSE);
628 if (!supports_sse ()) // Drop to 0 if no SSE support
629 UseSSE = 0;
630
631 // Use AES instructions if available.
632 if (supports_aes()) {
633 if (FLAG_IS_DEFAULT(UseAES)) {
634 FLAG_SET_DEFAULT(UseAES, true);
756 FLAG_SET_DEFAULT(UseSHA256Intrinsics, true);
757 }
758 } else if (UseSHA256Intrinsics) {
759 warning("Intrinsics for SHA-224 and SHA-256 crypto hash functions not available on this CPU.");
760 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);
761 }
762
763 if (UseSHA512Intrinsics) {
764 warning("Intrinsics for SHA-384 and SHA-512 crypto hash functions not available on this CPU.");
765 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);
766 }
767
768 if (!(UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics)) {
769 FLAG_SET_DEFAULT(UseSHA, false);
770 }
771
772 if (UseAdler32Intrinsics) {
773 warning("Adler32Intrinsics not available on this CPU.");
774 FLAG_SET_DEFAULT(UseAdler32Intrinsics, false);
775 }
776
777 if (supports_fma()) {
778 if (FLAG_IS_DEFAULT(UseFMA)) {
779 UseFMA = true;
780 }
781 }
782 else if (UseFMA) {
783 if (!FLAG_IS_DEFAULT(UseFMA))
784 warning("FMA instructions not available on this CPU");
785 FLAG_SET_DEFAULT(UseFMA, false);
786 }
787
788
789 // Adjust RTM (Restricted Transactional Memory) flags
790 if (!supports_rtm() && UseRTMLocking) {
791 // Can't continue because UseRTMLocking affects UseBiasedLocking flag
792 // setting during arguments processing. See use_biased_locking().
793 // VM_Version_init() is executed after UseBiasedLocking is used
794 // in Thread::allocate().
795 vm_exit_during_initialization("RTM instructions are not available on this CPU");
796 }
797
798 #if INCLUDE_RTM_OPT
799 if (UseRTMLocking) {
800 if (is_intel_family_core()) {
801 if ((_model == CPU_MODEL_HASWELL_E3) ||
802 (_model == CPU_MODEL_HASWELL_E7 && _stepping < 3) ||
803 (_model == CPU_MODEL_BROADWELL && _stepping < 4)) {
804 // currently a collision between SKL and HSW_E3
805 if (!UnlockExperimentalVMOptions && UseAVX < 3) {
806 vm_exit_during_initialization("UseRTMLocking is only available as experimental option on this platform. It must be enabled via -XX:+UnlockExperimentalVMOptions flag.");
807 } else {
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