[Bug lto/60404] wrong code by LTO on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60404

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

           What    |Removed                     |Added
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                 CC|                            |ebotcazou at gcc dot gnu.org,
                   |                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think r204742 broke this.
The assumption that you can coalesce all SSA_NAMEs of a particular PARM_DECL at
!optimize is only true without -flto, or if the function has been compiled with
-O0 before being streamed.
So, the quick hack would be to change all the optimize tests in r204742 to
optimize && !flag_ltrans, dunno if we have some way to query if a function has
been originally compiled with -O0.  That might mean we regress the param-4.c
testcase at -O0 -flto, but at least we don't generate wrong code.