[Bug rtl-optimization/55055] [4.8 regression] RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1123

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55055

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ra
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-10-24
                 CC|                            |vmakarov at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Uros Bizjak <ubizjak at gmail dot com> 2012-10-24 15:17:26 UTC ---
There should be no subregs in peephole2 pass.

In .203r.ira, we have:

(insn 153 156 169 9 (set (reg:SI 154 [ D.1790 ])
        (plus:SI (subreg:SI (reg:DI 87 [ a.0 ]) 0)
            (const_int -1 [0xffffffffffffffff]))) 240 {*leasi}
     (expr_list:REG_DEAD (reg:DI 87 [ a.0 ])
        (nil)))

and in .204r.reload, we still have:

(insn 153 156 169 9 (set (reg:SI 37 r8 [orig:154 D.1790 ] [154])
        (plus:SI (subreg:SI (reg:DI 37 r8 [orig:87 a.0 ] [87]) 0)
            (const_int -1 [0xffffffffffffffff]))) 240 {*leasi}
     (expr_list:REG_DEAD (reg:DI 37 r8 [orig:87 a.0 ] [87])
        (nil)))

I will take an uneducated guess that this is due to new LRA.

Adding CC.