https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71915

--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Something is causing us to hate the second case now, assigning "infinite" cost
to it:

Processing dependency tree rooted at 5.
Using existing initializer: _3 = -_2;

Increment vector:

  0  increment:   -8
     count:       1
     cost:        -24
     initializer: _3

  1  increment:   -16
     count:       1
     cost:        1000
     initializer:

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