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Re: PATCH: PA PIC symbolic memory fix PART 2

>   > On a related issue, I tried to determine why defining IS_RELOADING_PSEUDO_P
>   > is necessary for non pic code.  It seems without it that the following
>   > substitution occasionally occurs into the catch all move insn at line 2099
>   > in
>   > 
>   > (set (reg) (symbol))
>   > 
>   > Again, the insn at 2099 can't handle this.  I hadn't fully appreciated
>   > that CSE simplifies LO_SUM MEMs to just the constant symbol reference.
> That shouldn't be happening.  That's not a valid insn.  I'd suggest you
> dig into how/why that happened.

Take a look at the REG_EQUIV notes that are being put on non PIC
LO_SUMs.  Here is an random example from the lreg pass:

(insn 124 24 123 (set (reg/f:SI 96)
        (high:SI (symbol_ref:SI ("defs")))) 82 {*} (nil)
    (expr_list:REG_EQUIV (high:SI (symbol_ref:SI ("defs")))

(insn 123 124 25 (set (reg/f:SI 95)
        (lo_sum:SI (reg/f:SI 96)
            (symbol_ref:SI ("defs")))) 88 {*} (nil)
    (expr_list:REG_DEAD (reg/f:SI 96)
        (expr_list:REG_EQUIV (symbol_ref:SI ("defs"))

If you think the form of the REG_EQUIV notes are ok, I will try to figure out
what is happening in reload.

J. David Anglin                        
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

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