On 2024/04/19 17:58, Greg Steuck wrote: > James Cook <falsif...@falsifian.org> writes: > > > Here are some results of debugging with lldb. > > > > > > With cabal-bundler and pandoc, it seems to be the xgetbv instruction > > itself: > > > > > > $ lldb /usr/local/bin/cabal-bundler > > (lldb) target create "/usr/local/bin/cabal-bundler" > > Current executable set to '/usr/local/bin/cabal-bundler' (x86_64). > > (lldb) run > > Process 90738 launched: '/usr/local/bin/cabal-bundler' (x86_64) > > Process 90738 stopped > > * thread #1, stop reason = signal SIGILL > > frame #0: 0x00000000004c12ba cabal-bundler`___lldb_unnamed_symbol522 + > > 90 > > cabal-bundler`___lldb_unnamed_symbol522: > > -> 0x4c12ba <+90>: xgetbv > > Unless I'm missing something, xgetvb is not available in your CPU. > > cpu0: AMD Phenom(tm) II X3 710 Processor, 2611.95 MHz, 10-04-02, patch > 010000db > cpu0: > FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,MWAIT,CX16,POPCNT,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,3DNOW2,3DNOW,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,SKINIT,HWPSTATE,ITSC > > XGETBV1 is missing in the above and my cursory reading of > https://en.wikipedia.org/wiki/X86-64#AMD64 supports this conclusion. > > Somebody will have to adapt the checking code to be conditional on this > instruction presence if it's deemed important enough to support this CPU.
This is in the avx512 checks in the text library again, I think it must be patch-libraries_text_cbits_measure_off_c (the simdutf one doesn't explicitly check for xgetbv but it does check for osxsave so I think wouldn't have executed the xgetbv opcode on this cpu). As -current does now have avx512 support in the kernel we probably should be able to remove that patch, but it needs testing on an avx512 machine as well as that old Phenom.
