[Bug middle-end/65735] New: [5 Regression] ICE (in duplicate_thread_path, at tree-ssa-threadupdate.c) on arm-linux-gnueabihf

[doko at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65735

            Bug ID: 65735
           Summary: [5 Regression] ICE (in duplicate_thread_path, at
                    tree-ssa-threadupdate.c) on arm-linux-gnueabihf
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org

Created attachment 35290
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35290&action=edit
preprocessed source

seen with r221867 on arm-linux-gnueabihf

$ g++ -c -g -O2 menu.ii 
menu.ii: In function 'void fn2()':
menu.ii:2:6: internal compiler error: in duplicate_thread_path, at
tree-ssa-threadupdate.c:2445
 void fn2() {
      ^
0x7c2d8f duplicate_thread_path
        ../../src/gcc/tree-ssa-threadupdate.c:2444
0x7c2d8f thread_through_all_blocks(bool)
        ../../src/gcc/tree-ssa-threadupdate.c:2594
0x74020d execute
        ../../src/gcc/tree-ssa-dom.c:938
Please submit a full bug report,
with preprocessed source if appropriate.

$ cat menu.ii
int fn1();
void fn2() {
  int a, b, c;
  while (!a) {
    c = fn1();
    if (c == 7)
      c = b;
    switch (c) {
    case 1:
      a = b++;
      if (b)
        b = 1;
    }
  }
}

$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/5/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
5-20150404-0ubuntu11' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs
--enable-languages=c,ada,c++,java,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-5 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=c++98 --enable-gnu-unique-object --disable-libitm
--disable-libquadmath --enable-plugin --with-system-zlib
--disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-armhf/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-armhf
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-armhf
--with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --enable-multilib --disable-sjlj-exceptions
--with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb
--disable-werror --enable-multilib --enable-checking=yes
--build=arm-linux-gnueabihf --host=arm-linux-gnueabihf
--target=arm-linux-gnueabihf
Thread model: posix
gcc version 5.0.0 20150404 (experimental) [trunk revision 221867] (Ubuntu
5-20150404-0ubuntu11)