Thomas Koenig wrote:
Regarding PR 57073, the real case - I have never worked with
GIMPLE, so I have no real idea how to start this.

Any volunteers?  Or should we handle this in the Fortran front
end after all?

I think one should do it in the middle end. Actually, it shouldn't be that difficult. The starting point is gcc/builtins.c's fold_builtin_powi - all ingredients are there; (1.0)**k, x**0, x**1 and x**(-1) are already handled. Thus, only (-1)**k is missing. For "= (a)?(b):(c)" one uses "fold_build3_loc (loc, COND_EXPR, ..." and to check whether a real argument is -1, you can use "real_minus_onep".

How about writing your first middle end patch?

Tobias

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