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Congratulations :-)

You have beaten my brainfuck torture test and yet still have a nasty little bug.
Luckily I decided to run a full performance test and a few of the tests failed.
Here's the first boiled down test case:

$ astrange-bfi-switch <( echo '>+[>+>]<[<<]><++++++++++. '  )
 0 | 0 | PtrRight1
 1 | 0 | Inc1
 2 | 0 | Jz     (7, 2, =PtrLeft1)
 3 | 1 | PtrRight1
 4 | 1 | Inc1
 5 | 1 | PtrRight1
 6 | 1 | Jnz    (3, 1, =PtrRight1)
 7 | 2 | PtrLeft1
 8 | 2 | Jz     (11, 5, =PtrLeft)
 9 | 3 | PtrLeft        2
 10 | 4 | Jnz   (9, 3, =PtrLeft)
 11 | 5 | PtrLeft       10
 12 | 6 | Inc   0
 13 | 7 | Putchar
 14 | 7 | Return
fatal error: tape fell off the left side
Aborted

Though it has a rather different signature if I leave more code in place (this should print the letter 'C' followed by a newline).

$ astrange-bfi-direct <( echo '>+;+[>+>]<[<<]><[-]++++++++[>++++++++<-]>+>-[<<[-]>>>[-]++++[<<<++++++++>>>-]<<<[>>++++++++<<-]>>+[[-]<+++>]]<.>++++++++++.<<'  )
 0 | 0 | PtrRight1
 1 | 0 | Inc    2
 2 | 1 | Jz     (7, 3, =PtrLeft1)
 3 | 2 | PtrRight1
 4 | 2 | Inc1
 5 | 2 | PtrRight1
 6 | 2 | Jnz    (3, 2, =PtrRight1)
 7 | 3 | PtrLeft1
 8 | 3 | Jz     (11, 6, =PtrLeft)
 9 | 4 | PtrLeft        2
 10 | 5 | Jnz   (9, 4, =PtrLeft)
 11 | 6 | PtrLeft       8
 12 | 7 | Set   134523276
 13 | 8 | Jz    Segmentation fault