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From: Jiong Wang <jiong.wang@arm.com>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: James Greenhalgh <James.Greenhalgh@arm.com>, gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [COMMITTED][AArch64] Improve TLS Descriptor pattern to release RTL loop IV opt
Date: Tue, 11 Aug 2015 08:36:00 -0000
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Andreas Schwab writes:

> Jiong Wang <jiong.wang@arm.com> writes:
>
>>   I Just finished several round of rebuild & testing on clean
>>   environment.
>
> How did you even manage to compile it?
>
> ../../gcc/ira.c: In function 'void print_translated_classes(FILE*, bool)':
> ../../gcc/ira.c:1415:49: error: iteration 8u invokes undefined behavior [=
-Werror=3Daggressive-loop-optimizations]
>      fprintf (f, " %s -> %s\n", reg_class_names[i],
>                                                  ^
> ../../gcc/ira.c:1414:17: note: containing loop
>    for (i =3D 0; i < N_REG_CLASSES; i++)
>                  ^
>
> Andreas.

What I have done on a clean environment:

  1. checkout e5c427f3245ff69d8b014d4ff170715962178151 which might be
  the commit cause the trouble.

     mkdir build-dir1

     configure/build/check-go in build-dir1
     (configuation options --enable-languages=3Dc,c++,fortran,go
     --prefix=3D/home/jiowan01/COMMUNITY/install-gcc-native-reference
     --disable-bootstrap)

     and I do see lots of go failures.
=20=20=20=20=20
  2. checkout the one commit before this wrong commit.

     re-done everything in a new build-dir2

     check-go OK

  3. applied my new tlsdesc patch

     re-done everything in a new build-dir3
     check-go OK

  4. checkout

     commit 8b221598008f60621859caee561e8466e80049f7
     Author: jiwang <jiwang@138bc75d-0d04-0410-961f-82ee72b054a4>
     Date:   Mon Aug 10 10:06:28 2015 +0000

    [AArch64] Recommit correct version for improving TLS descriptor
    pattern

    re-done everything in a new build-dir4
    check-go OK


  my host gcc is "gcc version 4.8.2 (Ubuntu/Linaro 4.8.2-19ubuntu1)", I
  guess you have enabled bootstrap.
--=20
Regards,
Jiong