[Bug target/71279] New: ICE on trunk gcc with knl target

["anton.mitrokhin at phystech dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71279

            Bug ID: 71279
           Summary: ICE on trunk gcc with knl target
           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 38567
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38567&action=edit
Reproducer

Run:
> g++ -std=c++11 -O3 -march=knl -o out.o -c crash.cpp

Output:
crash.cpp: In function 'void fn1()':
crash.cpp:8:6: internal compiler error: in fold_convert_loc, at
fold-const.c:2360
 void fn1() {
      ^~~
0xa86b55 fold_convert_loc(unsigned int, tree_node*, tree_node*)
        /export/users/gnutester/stability/svn/trunk/gcc/fold-const.c:2360
0xa73d4c fold_ternary_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*, tree_node*)
        /export/users/gnutester/stability/svn/trunk/gcc/fold-const.c:11624
0xacf931 fold_gimple_assign
        /export/users/gnutester/stability/svn/trunk/gcc/gimple-fold.c:408
0xad4e2f fold_stmt_1
        /export/users/gnutester/stability/svn/trunk/gcc/gimple-fold.c:3762
0xe6a316 optimize_stmt
        /export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-dom.c:1792
0xe6a316 dom_opt_dom_walker::before_dom_children(basic_block_def*)
        /export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-dom.c:1380
0x13a2102 dom_walker::walk(basic_block_def*)
        /export/users/gnutester/stability/svn/trunk/gcc/domwalk.c:265
0xe6b578 execute
        /export/users/gnutester/stability/svn/trunk/gcc/tree-ssa-dom.c:614
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/)