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[charlie-foxtrot]

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[charlie-foxtrot]

Note to future self - linux/amd64 container failed on an older machine with:

Program received signal SIGILL, Illegal instruction.
0x0000558a35cee663 in _GLOBAL__sub_I_devices ()
(gdb) disassemble /m
Dump of assembler code for function _GLOBAL__sub_I_devices:
   0x0000558a35cee630 <+0>:	push   %rbx
   0x0000558a35cee631 <+1>:	lea    0x2046c(%rip),%rbx        # 0x558a35d0eaa4 <_ZStL8__ioinit>
   0x0000558a35cee638 <+8>:	mov    %rbx,%rdi
   0x0000558a35cee63b <+11>:	call   0x558a35cedb90 <_ZNSt8ios_base4InitC1Ev@plt>
   0x0000558a35cee640 <+16>:	mov    0x1f971(%rip),%rdi        # 0x558a35d0dfb8
   0x0000558a35cee647 <+23>:	lea    0x2011a(%rip),%rdx        # 0x558a35d0e768
   0x0000558a35cee64e <+30>:	mov    %rbx,%rsi
   0x0000558a35cee651 <+33>:	call   0x558a35ceda10 <__cxa_atexit@plt>
   0x0000558a35cee656 <+38>:	mov    0x20123(%rip),%rdx        # 0x558a35d0e780 <fft_size_log>
   0x0000558a35cee65d <+45>:	mov    $0x1,%eax
   0x0000558a35cee662 <+50>:	pop    %rbx
=> 0x0000558a35cee663 <+51>:	shlx   %edx,%eax,%eax
   0x0000558a35cee668 <+56>:	cltq
   0x0000558a35cee66a <+58>:	mov    %rax,0x203f7(%rip)        # 0x558a35d0ea68 <fft_size>
   0x0000558a35cee671 <+65>:	ret
End of assembler dump.

that is part of BMI2 - https://en.wikipedia.org/wiki/X86_Bit_manipulation_instruction_set