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Re: REGRESSION in 3.2.1-pre on mips-irix6 (and elsewhere) compiling execute/20011219-1.c

From: Franz Sirl <Franz dot Sirl-kernel at lauterbach dot com>
To: "Kaveh R. Ghazi" <ghazi at caip dot rutgers dot edu>
Cc: mark at codesourcery dot com,David dot Billinghurst at riotinto dot com,gcc-bugs at gcc dot gnu dot org,gcc at gcc dot gnu dot org,graham dot stott at btinternet dot com,jh at suse dot cz
Date: Wed, 13 Nov 2002 11:06:06 +0100
Subject: Re: REGRESSION in 3.2.1-pre on mips-irix6 (and elsewhere) compiling execute/20011219-1.c

At 08:11 13.11.2002, Kaveh R. Ghazi wrote:

Based on the dates in the ChangeLog and the descriptions of the
patches, I suspect its one of these below.  However it's 2am here so
I'll have to defer further investigation until tomorrow.

                --Kaveh


2002-11-11  Franz Sirl  <Franz.Sirl-kernel@lauterbach.com>

        PR c/8467
        * stmt.c (tail_recursion_args): Handle DECL_MODE differing
        from the mode of DECL_RTL case.

2002-11-11  Graham Stott  <graham.stott@btinternet.com>
            Jan Hubicka  <jh@suse.cz>

        PR 8502
        * cfgrtl.c (try_redirect_by_replacing_jump): Do not kill
        computed jumps post reload.

Jan, Graham,

since powerpc-linux-gnu was a testplatform for the stmt.c patch, your patch seemed like the more likely culprit. In fact reverting it fixed it for powerpc-linux-gnu.

The failing testcases:

gcc.dg/compile/20020430-1.c at -O2
gcc.c-torture/execute/20011219-1.c at -O3

The failure mode in both cases is:
[fsirl@entropy:~/obj/gcc32/gcc]$ gcc
/home/fsirl/cvsx/gcc32/gcc/testsuite/gcc.dg/20020430-1.c -B./ -c -O2
/home/fsirl/cvsx/gcc32/gcc/testsuite/gcc.dg/20020430-1.c: In function
GetEventEntry':
/home/fsirl/cvsx/gcc32/gcc/testsuite/gcc.dg/20020430-1.c:190: Internal
compiler error in merge_blocks_move_predecessor_nojumps, at cfgcleanup.c:650

Jan, since you have access to entropy and my homedir on it, feel free to start a quick debugging session there (source in ~fsirl/cvsx/gcc32/, build in ~fsirl/obj/gcc32/). I'm on IRC at irc.openprojects.net, channel #GCC if you have any questions.

Franz.

References:
- REGRESSION in 3.2.1-pre on mips-irix6 (and elsewhere) compiling execute/20011219-1.c
  - From: Kaveh R. Ghazi

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