http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58208
--- Comment #12 from Tammy Hsu <tammy at Cadence dot COM> --- I installed the required i686 rpms on the Fedora 19 system, and the testcase works without crash (using the /bin/g++). I then built gcc481 on the Fedora 19 system, the testcase also works fine when I compile/link it with my own build gcc481. So it may really be a glibc compatibility issue (as Mikael said in comment 7). >From Mikael and I have done: Not working if build gcc481 on: RHEL 5.5 - glibc 2.5 CentOS 5.8 - glibc 2.5 (done by Mikael) RHEL 6.3 - glibc 2.12 Working if build gcc481 on Fedora 17 - glibc 2.15 (done by Mikael) Fedora 19 - glibc-2.17 Also if I use the gcc481 built on RHEL 5.5 or RHEL 6.3, and run on Fedora 19, the testcase works also. So something changed between gcc4.7.3 and gcc 4.8.1 that causes "-ftree-vectorize" optimization not work well (32bit only) with older glibc.