[Bug tree-optimization/31280] New: segfault in remove_referenced_var

["pthaugen at us dot ibm dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Seeing the following with mainline using -O2 -ftree-loop-linear when
building galgel benchmark from cpu2000.

I couldn't whittle down to a single testcase so will attatch both source files.

178.galgel/run> /home/pthaugen/install/gcc/trunk/bin/gfortran -c -m64
-ffixed-form -O2 -ftree-loop-linear modules.f90
178.galgel/run> /home/pthaugen/install/gcc/trunk/bin/gfortran -c -m64
-ffixed-form -O2 -ftree-loop-linear sysnsL.f90
sysnsL.f90: In function #sysnsl#:
sysnsL.f90:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

(gdb) run
Starting program:
/home/pthaugen/install/gcc/trunk/libexec/gcc/powerpc64-linux/4.3.0/f951
sysnsL.f90 -quiet -dumpbase sysnsL.f90 -m64 -auxbase sysnsL -O2 -version
-ffixed-form -ftree-loop-linear -fintrinsic-modules-path
/home/pthaugen/install/gcc/trunk/lib/gcc/powerpc64-linux/4.3.0/finclude -o
sysnsL.s
GNU F95 version 4.3.0 20070314 (experimental) (powerpc64-linux)
        compiled by GNU C version 4.1.0 (SUSE Linux).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096

Program received signal SIGSEGV, Segmentation fault.
remove_referenced_var (var=<value optimized out>)
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-dfa.c:771
771       ggc_free (*loc);
(gdb) bt 5
#0  remove_referenced_var (var=<value optimized out>)
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-dfa.c:771
#1  0x103d1238 in remove_unused_locals ()
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-ssa-live.c:518
#2  0x1026f204 in execute_function_todo (data=<value optimized out>)
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/passes.c:865
#3  0x1026ee44 in do_per_function (callback=0x1026efe0 <execute_function_todo>,
data=0x21)
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/passes.c:757
#4  0x1026ef4c in execute_todo (flags=33) at
/home/pthaugen/src/gcc/trunk/gcc/gcc/passes.c:935
(More stack frames follow...)


-- 
           Summary: segfault in remove_referenced_var
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pthaugen at us dot ibm dot com
 GCC build triplet: powerpc64-linux
  GCC host triplet: powerpc64-linux
GCC target triplet: powerpc64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31280