[Bug middle-end/14084] Reg allocator changes REG_EXPR

["zlomj9am at artax dot karlin dot mff dot cuni dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From zlomj9am at artax dot karlin dot mff dot cuni dot cz  2004-02-09 16:44 -------
Subject: Re:  Reg allocator changes REG_EXPR

> A slightly older gcc and I do not see this (3.4.0 20031228), I am wondering if something changed 
> between then and now which could have effected this.
> Here is what I see:
> lgrep:
> 
> (insn:HI 52 9 53 0 (set (reg:CC 124)
>         (compare:CC (subreg/s:SI (reg/v:DI 119 [ rdcount ]) 4)
>             (subreg/s:SI (reg/v:DI 118 [ repcount ]) 4))) 412 {*cmpsi_internal1} (insn_list 9 (insn_list 3 (nil)))
>     (expr_list:REG_EQUAL (compare:CC (const_int 0 [0x0])
>             (subreg/s:SI (reg/v:DI 118 [ repcount ]) 4))
>         (nil)))
> grep:
>
> (insn:HI 52 9 53 0 (set (reg:CC 7 [124])
>         (compare:CC (reg:SI 31 [orig:119 rdcount+4 ] [119])
>             (reg:SI 30 [orig:118 repcount+4 ] [118]))) 412 {*cmpsi_internal1} (insn_list 9 (insn_list 3 (nil)))
>     (expr_list:REG_EQUAL (compare:CC (const_int 0 [0x0])
>             (subreg/s:SI (reg/v:DI 30 [orig:118 repcount ] [118]) 4))
>         (nil)))

I see the problem here:
(subreg/s:SI (reg/v:DI 118 [ repcount ]) 4)
is changed to
(reg:SI 30 [orig:118 repcount+4 ] [118])

Josef


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14084