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Subject: [Bug bootstrap/54688] [4.8 regression] violation of implicit restriction "No_Elaboration_Code" on a-ioexce.ads
Date: Wed, 26 Sep 2012 11:44:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54688

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bernds at gcc dot gnu.org

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-09-26 11:43:40 UTC ---
It's r191493, the transformation is applied to a %sp-based load, which is
invalid since the frame is destroyed, and the resulting offset is bogus:

In .split4:

(insn 52 41 43 4 (set (reg:SI 1 %g1 [orig:137 D.6097+8 ] [137])
        (mem/c:SI (plus:SI (reg/f:SI 14 %sp)
                (const_int 80 [0x50])) [23 D.6097+8 S4 A64]))
/home/eric/svn/gcc/gcc/ada/restrict.adb:1067 61 {*movsi_insn}
     (expr_list:REG_EQUIV (mem/c:SI (plus:SI (reg/f:SI 14 %sp)
                (const_int 80 [0x50])) [23 D.6097+8 S4 A64])
        (nil)))

[...]
(note 60 43 61 4 NOTE_INSN_EPILOGUE_BEG)

(insn 61 60 62 4 (set (reg/f:SI 14 %sp)
        (minus:SI (reg/f:SI 14 %sp)
            (const_int -88 [0xffffffffffffffa8])))
/home/eric/svn/gcc/gcc/ada/restrict.adb:1068 183 {subsi3}

In .sched2:

(insn 61 64 52 4 (set (reg/f:SI 14 %sp)
        (minus:SI (reg/f:SI 14 %sp)
            (const_int -88 [0xffffffffffffffa8])))
/home/eric/svn/gcc/gcc/ada/restrict.adb:1068 183 {subsi3}
     (nil))

(insn 52 61 43 4 (set (reg:SI 1 %g1 [orig:137 D.6097+8 ] [137])
        (mem/c:SI (plus:SI (reg/f:SI 14 %sp)
                (const_int 168 [0xa8])) [23 D.6097+8 S4 A64]))
/home/eric/svn/gcc/gcc/ada/restrict.adb:1067 61 {*movsi_insn}
     (expr_list:REG_EQUIV (mem/c:SI (plus:SI (reg/f:SI 14 %sp)
                (const_int 80 [0x50])) [23 D.6097+8 S4 A64])
        (nil)))