[Bug target/50588] New: gcc produce bad inlined code with -march=athlon -O2
newsgrp at duradsl dot dyndns.org
gcc-bugzilla@gcc.gnu.org
Sun Oct 2 11:40:00 GMT 2011
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: unassigned@gcc.gnu.org
ReportedBy: newsgrp@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)
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