[Bug target/50588] New: gcc produce bad inlined code with -march=athlon -O2

[newsgrp at duradsl dot dyndns.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50588

             Bug #: 50588
           Summary: gcc produce bad inlined code with -march=athlon -O2
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: news...@duradsl.dyndns.org


Created attachment 25394
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25394
Reduced example that trigger the bug

When the attached file (which is a reduced testcase from inetutils
traceroute.c) is compiled with -march=athlon -O2, the resulting binary
segfault:

gcc -march=athlon -O2 -o traceroute traceroute.c
./traceroute
Before
Segmentation fault

When inlining is disabled, no problem:
gcc -march=athlon -O2 -fno-inline -o traceroute traceroute.c
./traceroute
Before
After

The problem can be reproduced on athlon-xp and core2 machines with 32 bits
libs.

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-linux-gnu/4.6.1/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.6.1/configure --prefix=/usr --libexecdir=/usr/lib
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-languages=c,c++ --disable-multilib
--disable-bootstrap --with-system-zlib
Thread model: posix
gcc version 4.6.1 (GCC)