[Bug rtl-optimization/87138] New: [8/9 Regression] wrong code with TI multiplication with -O -march=k8 -fno-tree-fre -mavx512bw

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87138

            Bug ID: 87138
           Summary: [8/9 Regression] wrong code with TI multiplication
                    with -O -march=k8 -fno-tree-fre -mavx512bw
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: rtl-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 44620
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44620&action=edit
reduced testcase

Output:
$ x86_64-pc-linux-gnu-gcc -O -march=k8 -fno-tree-fre -mavx512bw testcase.c
$ sde64 -- ./a.out
Aborted

The difference between broken a good assembler is:

        movabs  rax, 9223372036854775805        # tmp167,
-       mov     rdx, -2 #,
+       mov     rdx, 1  #,
        mov     QWORD PTR [rsp], rax    # %sfpD.2961, tmp167
        mov     QWORD PTR [rsp+8], rdx  # %sfpD.2961,

For some reason, 3 * 0x7FFFFFFFFFFFFFFF is computed as
0xfffffffffffffffe7ffffffffffffffd instead of 0x17ffffffffffffffd.

The wrong value first appears in the .cse1 dump.

$ 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-263946-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-263946-checking-yes-rtl-df-extra-amd64
Thread model: posix
gcc version 9.0.0 20180829 (experimental) (GCC)