[Bug middle-end/68117] [6 Regression] error: invalid PHI argument <<< Unknown tree: <invalid tree code> >>>

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68117

--- Comment #33 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Gary Funck from comment #32)
> (In reply to Gary Funck from comment #17)
> > We're seeing this ICE on x86-64, while building the 32-bit libgfortran.
> > We're building the target libraries with -O3 with GCC compiler checks
> > enabled.
> 
> The recent r230424 commit did *not* fix this regression.  Note that we're
> building with CFLAGS_FOR_TARGET='-O3 -g'.

Can you try the patch attached to comment #29?