[Bug tree-optimization/87546] [9 Regression] Gcc miscompiles at -O3 on valid code

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87546

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to graham.stott77 from comment #3)
> 'b' is never assigned a value, so surely it's undefined

No.  b has static storage duration and therefore it is initialized to zero.