[Bug tree-optimization/88563] New: [7/8/9 Regression] wrong code with -O2 -fno-code-hoisting -fno-tree-ccp -fno-tree-dominator-opts -fno-tree-forwprop -fno-tree-fre -fno-tree-pre -fno-tree-vrp

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88563

            Bug ID: 88563
           Summary: [7/8/9 Regression] wrong code with -O2
                    -fno-code-hoisting -fno-tree-ccp
                    -fno-tree-dominator-opts -fno-tree-forwprop
                    -fno-tree-fre -fno-tree-pre -fno-tree-vrp
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 45272
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45272&action=edit
reduced testcase

Output:
$ x86_64-pc-linux-gnu-gcc -O2 -fno-code-hoisting -fno-tree-ccp
-fno-tree-dominator-opts -fno-tree-forwprop -fno-tree-fre -fno-tree-pre
-fno-tree-vrp testcase.c
$ ./a.out 
Aborted

Value of 'a' is 0xfffffffffffffffffffffffffffffffb (-5) instead of
0x4fffffffffffffffb (5 * 0xffffffffffffffff).

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-267263-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-267263-checking-yes-rtl-df-extra-amd64
Thread model: posix
gcc version 9.0.0 20181219 (experimental) (GCC)