[Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88739

--- Comment #21 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Eric Botcazou from comment #20)
> > BITS_BIG_ENDIAN is just a convenience to the target code writer.  The other
> > four do matter, and are quite obvious really (and all four are necessary).
> 
> Yes, I agree that BITS_BIG_ENDIAN shouldn't matter here, it's pure RTL stuff.

Is it really pure RTL, therefore not used in tree? So the above patch using
BITS_BIG_ENDIAN for tree stuff would be incorrect to use it?