[Bug lto/85574] [8/9 Regression] LTO bootstapped binaries differ

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85574

--- Comment #20 from rguenther at suse dot de <rguenther at suse dot de> ---
On January 2, 2019 5:25:09 PM GMT+01:00, "hubicka at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85574
>
>--- Comment #19 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
>gcc 5 has:
>inline bool                                                            
>        
>val_ssa_equiv_hash_traits::equal_keys (tree value1, tree value2)       
>        
>{                                                                      
>        
>return operand_equal_p (value1, value2, 0);                            
>      
>}                                                                      
>        
>
>/* Free an instance of equiv_hash_elt.  */                             
>        
>
>template<typename T>                                                   
>        
>inline void                                                            
>        
>val_ssa_equiv_hash_traits::remove (T &elt)                             
>        
>{                                                                      
>        
>elt.m_value.release ();                                                
>      
>}                                                                      
>        
>
>while in mainline we seem to compare addresses... Looks like wrong
>update to
>hash_map.

But still it doesn't explain differences in tree sharing between stage2 and
three. 

But yes, I'll go track things down a bit more.