[Bug tree-optimization/117919] [14/15 Regression] ICE: in propagate, at gimple-ssa-sccopy.cc:625 with -O -fno-tree-forwprop -fnon-call-exceptions --param=early-inlining-insns=192

[pheeck at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117919

Filip Kastl <pheeck at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Assignee|unassigned at gcc dot gnu.org      |pheeck at gcc dot 
gnu.org

--- Comment #2 from Filip Kastl <pheeck at gcc dot gnu.org> ---
Thanks for Cc-ing me.

Apparently, SCCOPY copy-propagates on this statement

_25 = &MEM[(struct path *)&writer]._M_pathname;

and that somehow makes

# .MEM_37 = PHI <.MEM_52(11), .MEM_53(12)>

into

_37 = PHI <>

And then SCCOPY crashes because it expects PHIs to have arguments.

Not sure how this happens.  Maybe the copy propagation shouldn't be done and
doing it corrupts GCC's memory?

Will look into this some more.