[Bug tree-optimization/68761] New: -floop-interchange internal compiler error: in create_tmp_var, at gimple-expr.c:519

[jtaylor.debian at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68761

            Bug ID: 68761
           Summary: -floop-interchange internal compiler error: in
                    create_tmp_var, at gimple-expr.c:519
           Product: gcc
           Version: 5.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jtaylor.debian at googlemail dot com
  Target Milestone: ---

following code causes an ICE in gcc 5.3.0 when compiled with
-floop-interchange. Not sure if it is an regression as I currently don't have a
5.2 available. gcc 4.8 and current gcc svn head are fine.

int a, b, c;
void fn1() {
  int n;
  a = 0;
  for (; a < n; a++) {
    c = 0;
    for (; c < n; c++, b++)
      ;
  }
}

$ gcc -g -O3 -floop-interchange -std=c99  lin.i
lin.i: In function ‘fn1’:
lin.i:2:6: internal compiler error: in create_tmp_var, at gimple-expr.c:519
 void fn1() {
      ^
Please submit a full bug report,

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/tmp/local/jenkins-gcc/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.3.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --enable-languages=c,c++,fortran --enable-tls
--prefix=/diskb/scratch/jenkinsBuild/psdubuntu12-04-amd64/workspace/user-jtaylor-gcc-multi/ARCH/x86_64/OS/Ubuntu12.04/jenkins-gcc/
--disable-bootstrap --disable-werror --disable-multilib
Thread model: posix
gcc version 5.3.0 (GCC) 

$ gcc --version
gcc (GCC) 5.3.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.