[Bug target/71280] New: ICE on gcc trunk on knl, wsm, ivb and bdw targets

[anton.mitrokhin at phystech dot edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71280

            Bug ID: 71280
           Summary: ICE on gcc trunk on knl, wsm, ivb and bdw targets
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anton.mitrokhin at phystech dot edu
  Target Milestone: ---

Created attachment 38568
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38568&action=edit
Reproducer

Run any of the:
> g++ -std=c++11 -Ofast -march=knl -o out -c crash.cpp
> g++ -std=c++11 -Ofast -march=broadwell -o out -c crash.cpp
> g++ -std=c++11 -Ofast -march=ivybridge -o out -c crash.cpp
> g++ -std=c++11 -Ofast -march=westmere -o out -c crash.cpp

Output:
crash.cpp: In function 'void fn1()':
crash.cpp:16:1: internal compiler error: Segmentation fault
 }
 ^
0xd499bf crash_signal
        /export/users/gnutester/stability/svn/trunk/gcc/toplev.c:333
0xa67929 operand_equal_p(tree_node const*, tree_node const*, unsigned int)
        /export/users/gnutester/stability/svn/trunk/gcc/fold-const.c:2769
0xa67c07 operand_equal_p(tree_node const*, tree_node const*, unsigned int)
        /export/users/gnutester/stability/svn/trunk/gcc/fold-const.c:2751
0xfdd2e5 array_at_struct_end_p(tree_node*)
        /export/users/gnutester/stability/svn/trunk/gcc/tree.c:13100
0xeafdce idx_infer_loop_bounds
       
/export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-loop-niter.c:3125
0xeb6e68 for_each_index(tree_node**, bool (*)(tree_node*, tree_node**, void*),
void*)
        /export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-loop.c:657
0xeadc97 infer_loop_bounds_from_ref
       
/export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-loop-niter.c:3211
0xeadc97 infer_loop_bounds_from_array
       
/export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-loop-niter.c:3232
0xeadc97 infer_loop_bounds_from_undefined
       
/export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-loop-niter.c:3384
0xeadc97 estimate_numbers_of_iterations_loop
       
/export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-loop-niter.c:3755
0xeaf17c max_loop_iterations(loop*,
generic_wide_int<fixed_wide_int_storage<192> >*)
       
/export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-loop-niter.c:3828
0xeaf222 finite_loop_p(loop*)
       
/export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-loop-niter.c:2419
0xe61c37 find_obviously_necessary_stmts
        /export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-dce.c:420
0xe65bf3 perform_tree_ssa_dce
        /export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-dce.c:1589
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.


> gcc -v:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/export/users/amitrokh/gcc_trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /export/users/gnutester/stability/svn/trunk/configure
--with-arch=corei7 --with-cpu=corei7 --enable-clocale=gnu --with-system-zlib
--enable-shared --with-demangler-in-ld --enable-cloog-backend=isl
--with-fpmath=sse --with-pkgversion=Revision=236669/svn-rev:236669/
--prefix=/export/users/gnutester/stability/work/trunk/64/install
--enable-languages=c,c++,fortran,java,lto
Thread model: posix
gcc version 7.0.0 20160524 (experimental) (Revision=236669/svn-rev:236669/)