[Bug c/57491] New: [ia64] internal compiler error: in ia64_split_tmode -O2, quadmath

["jtaylor.debian at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57491

            Bug ID: 57491
           Summary: [ia64] internal compiler error: in ia64_split_tmode
                    -O2, quadmath
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jtaylor.debian at gmail dot com

Created attachment 30236
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30236&action=edit
preprocessed files

when compiling fftw3 3.3.3 with quadmath on ia64 it fails with an internal
compiler error:

gcc-4.8 -std=gnu99 -DHAVE_CONFIG_H -I. -I../../.. -I../../../kernel
-I../../../rdft -I../../../rdft/scalar -D_FORTIFY_SOURCE=2 -g -O2 -Wformat
-Werror=format-security -O2 -MT r2cf_8.lo -MD -MP -MF .deps/r2cf_8.Tpo -c
r2cf_8.c  -fPIC -DPIC -o .libs/r2cf_8.o
r2cf_8.c: In function 'r2cf_8':
r2cf_8.c:83:1: internal compiler error: in ia64_split_tmode, at
config/ia64/ia64.c:1453
 }


the failure does not occur with -O1 or -O3, only with -O2

reproduceable with the attached .i file with:
gcc-4.8 -std=gnu99 -O2 r2cf_8.i -c -fPIC

the system is debian unstable with gcc-4.8 (4.8.0-9) which is according to the
package changelog SVN 20130529 (r199410)

$ gcc-4.8 -v
Using built-in specs.
COLLECT_GCC=gcc-4.8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/ia64-linux-gnu/4.8/lto-wrapper
Target: ia64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.8.0-9'
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libssp
--disable-libitm --disable-libsanitizer --enable-plugin --with-system-zlib
--enable-objc-gc --enable-multiarch --with-system-libunwind
--enable-checking=release --build=ia64-linux-gnu --host=ia64-linux-gnu
--target=ia64-linux-gnu
Thread model: posix
gcc version 4.8.0 (Debian 4.8.0-9)