[Bug rtl-optimization/86104] New: gcc ICE at -O1 on x86_64-linux-gnu in "plus_constant", at explow.c:103

[helloqirun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86104

            Bug ID: 86104
           Summary: gcc ICE at -O1 on x86_64-linux-gnu in "plus_constant",
                    at explow.c:103
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: helloqirun at gmail dot com
  Target Milestone: ---

It happens at 32-bit mode only.


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 9.0.0 20180610 (experimental) [trunk revision 261387] (GCC)


$ gcc-trunk -m32 -O1 abc.c
during RTL pass: dse1
abc.c: In function ‘times_two’:
abc.c:16:1: internal compiler error: in plus_constant, at explow.c:103
 }
 ^
0x61289b plus_constant(machine_mode, rtx_def*, poly_int<1u, long>, bool)
        ../../gcc/gcc/explow.c:103
0x13e5e47 record_store
        ../../gcc/gcc/dse.c:1505
0x13e6a92 scan_insn
        ../../gcc/gcc/dse.c:2548
0x13e7912 dse_step1
        ../../gcc/gcc/dse.c:2660
0x13e7912 rest_of_handle_dse
        ../../gcc/gcc/dse.c:3577
0x13e7912 execute
        ../../gcc/gcc/dse.c:3635
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ cat abc.c
 int __RTL (startwith ("vregs")) times_two (int i)
{
    (function ""
     (param "i"
      (DECL_RTL (mem(plus) [0  ]))
      (DECL_RTL_INCOMING (reg di ))
     ) (insn-chain
        (block 2
         (edge-from entry )
         (cnote 4 [bb 2] NOTE_INSN_BASIC_BLOCK)
     (cinsn 2 (set (mem:SI (plus:DI (reg virtual-stack-vars)
                                (const_int 4)) [1 i+A32])
               (reg:SI di )) )
         (edge-to exit (flags "FALLTHRU"))
        ) ) )
}