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From: "steven at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/55597] [4.8 Regression] internal compiler error: in plus_constant, at explow.c:88
Date: Tue, 04 Dec 2012 23:25:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55597

Steven Bosscher <steven at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |steven at gcc dot gnu.org
          Component|middle-end                  |target

--- Comment #3 from Steven Bosscher <steven at gcc dot gnu.org> 2012-12-04 23:24:41 UTC ---
Out of expand GCC produces:

(insn 6 5 7 2 (set (reg:DI 61)
        (reg:DI 0 ax)) t.c:8 -1
     (expr_list:REG_EQUAL (symbol_ref:SI ("__morestack_initial_sp") \
   [flags 0x10]  <var_decl 0x7ffff6263720 __morestack_initial_sp>)
        (nil)))
(insn 7 6 8 2 (parallel [
            (set (reg:DI 62)
                (plus:DI (reg:DI 61)
                    (const_int 4 [0x4])))
            (clobber (reg:CC 17 flags))
        ]) t.c:8 -1
     (nil))

In alias.c, the compiler tries to simplify r62=r61+4 to
r62=symbol_ref:SI ("__morestack_initial_sp")+4 but plus_constant
doesn't accept symbol_ref:SI ("__morestack_initial_sp") because it
is is SImode but should be DImode.

Back-end bug, I'm guessing something Pmode related.