[Bug target/63223] [avr] Make jumptables work with -Wl,--section-start,.text=

["amylaar at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63223

Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> changed:

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

--- Comment #4 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> ---
(In reply to Georg-Johann Lay from comment #1)
> Author: gjl
> Date: Thu Sep 11 08:08:17 2014
> New Revision: 215152
> 
> URL: https://gcc.gnu.org/viewcvs?rev=215152&root=gcc&view=rev
> Log:
> gcc/
> 	PR target/63223
> 	* config/avr/avr.md (*tablejump.3byte-pc): New insn.
> 	(*tablejump): Restrict to !AVR_HAVE_EIJMP_EICALL.  Add void clobber.
> 	(casesi): Expand to *tablejump.3byte-pc if AVR_HAVE_EIJMP_EICALL.
> libgcc/
> 	PR target/63223
> 	* config/avr/libgcc.S (__tablejump2__): Rewrite to use RAMPZ, ELPM
> 	and R24 as needed.  Make work for all devices and .text locations.
> 	(__do_global_ctors, __do_global_dtors): Use word addresses.

do_global_dtors is supposed to start at the start and increment from there.
I see it used to be half-way wrong and half-way correct.
(Starting at the start, decrementing for __AVR_HAVE_ELPM__, incrementing
otherwise.)
However, you now made it all the way use an incorrect order - starting at the
end and incrementing from there.
Is there a rationale for this?
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/63576] New: [5 Regression] ICE : in ipa_merge_profiles, at ipa-utils.c:540 during Firefox LTO/PGO build
Date: Fri, 17 Oct 2014 14:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc576

            Bug ID: 63576
           Summary: [5 Regression] ICE : in ipa_merge_profiles, at
                    ipa-utils.c:540 during Firefox LTO/PGO build
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: marxin at gcc dot gnu.org

% wget trippelsdorf.de/testcase.tar.bz2
 % tar xvjf testcase.tar.bz2
 % g++ -w -march=amdfam10 -flto=4 -fprofile-use -fprofile-correction
-ffunction-sections -fdata-sections -fno-rtti -fno-exceptions -fno-math-errno
-std=gnu++0x -pipe -O3 Unified_cpp_js_src1.ii Unified_cpp_js_src2.ii
Unified_cpp_js_src3.ii
lto1: internal compiler error: in ipa_merge_profiles, at ipa-utils.c:540
0x7f7d55 ipa_merge_profiles(cgraph_node*, cgraph_node*)
        ../../gcc/gcc/ipa-utils.c:540
0xf57883 ipa_icf::sem_function::merge(ipa_icf::sem_item*)
        ../../gcc/gcc/ipa-icf.c:625
0xf5cc86 ipa_icf::sem_item_optimizer::merge_classes(unsigned int)
        ../../gcc/gcc/ipa-icf.c:2241
0xf60bf9 ipa_icf::sem_item_optimizer::execute()
        ../../gcc/gcc/ipa-icf.c:1602
0xf61671 ipa_icf_driver
        ../../gcc/gcc/ipa-icf.c:2319
0xf61671 ipa_icf::pass_ipa_icf::execute(function*)
        ../../gcc/gcc/ipa-icf.c:2366
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions

-fno-ipa-icf "fixes" the issue.