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Dec 6, 2024

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pmienk16:26
Did you enable an intrinsic your cpu doesn't support?
7 replies · neillm, pmienk, evoskuil · last Dec 06, 2024
neillm16:27
In theory, I think my CPU supports all 4 options, but I could try to enable one by one until I see an error
pmienk16:29
Why not start with lscpu
(edited)
neillm16:31
Right, I thought they were covered though, maybe not: 
    Flags:                fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe
                          1gb rdtscp lm constant_tsc rep_good amd_lbr_v2 nopl xtopology nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ss
                          se3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy extapic cr8_legacy abm sse4a misalignsse
                           3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba
                           perfmon_v2 ibrs ibpb stibp ibrs_enhanced vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx sm
                          ap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total c
                          qm_mbm_local avx512_bf16 clzero irperf xsaveerptr rdpru wbnoinvd cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbya
                          sid decodeassists pausefilter pfthreshold avic vgif x2avic v_spec_ctrl vnmi avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmul
                          qdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid overflow_recov succor smca fsrm flush_l1d amd_lbr_pmc_freeze
evoskuil16:31
These tests determine exactly what is present that we need, and can be run from a default build. https://github.com/libbitcoin/libbitcoin-system/blob/master/test/intrinsics/haves.cpp
evoskuil16:32
Specifically we need avx512bw
neillm16:32
That's in there
evoskuil16:33
Then try the same with the reset but not avx512, as I haven't tested with it.
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