[Bug target/69014] New: [4.9/5/6 Regression] gcc.c-torture/execute/991023-1.c FAILs with -Os -fmodulo-sched -fno-tree-vrp

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69014

            Bug ID: 69014
           Summary: [4.9/5/6 Regression] gcc.c-torture/execute/991023-1.c
                    FAILs with -Os -fmodulo-sched -fno-tree-vrp
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: armv7a-*-linux-gnueabi

Created attachment 37107
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37107&action=edit
testcase (gcc.c-torture/execute/991023-1.c)

Output:
$ armv7a-hardfloat-linux-gnueabi-gcc -Os -fmodulo-sched -fno-tree-vrp
testcase.c
$ qemu-arm ./a.out 
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted


$ armv7a-hardfloat-linux-gnueabi-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-trunk-231884-checking-yes-rtl-df-nographite-armv7a-hardfloat/bin/armv7a-hardfloat-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-231884-checking-yes-rtl-df-nographite-armv7a-hardfloat/bin/../libexec/gcc/armv7a-hardfloat-linux-gnueabi/6.0.0/lto-wrapper
Target: armv7a-hardfloat-linux-gnueabi
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-checking=yes,rtl,df --without-cloog --without-ppl --without-isl
--with-float=hard --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=armv7a-hardfloat-linux-gnueabi
--with-ld=/usr/bin/armv7a-hardfloat-linux-gnueabi-ld
--with-as=/usr/bin/armv7a-hardfloat-linux-gnueabi-as
--with-sysroot=/usr/armv7a-hardfloat-linux-gnueabi --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-231884-checking-yes-rtl-df-nographite-armv7a-hardfloat
Thread model: posix
gcc version 6.0.0 20151221 (experimental) (GCC) 


Other targets (powerpc[64], aarch64, i686, x86_64, x32) do not have this
problem.

Tested revisions:
r231884 - FAIL
5-branch r231870 - FAIL
4_9-branch r231865 - FAIL
4_8-branch r224828 - OK