[Bug debug/112875] New: ICE: in lra_eliminate_regs_1, at lra-eliminations.cc:670 with -Oz -frounding-math -fno-dce -fno-trapping-math -fno-tree-dce -fno-tree-dse -g

[iamanonymous.cs at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112875

            Bug ID: 112875
           Summary: ICE: in lra_eliminate_regs_1, at
                    lra-eliminations.cc:670 with -Oz -frounding-math
                    -fno-dce -fno-trapping-math -fno-tree-dce
                    -fno-tree-dse -g
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: iamanonymous.cs at gmail dot com
  Target Milestone: ---

*******************************************************************************
OS and Platform:
$ uname -a:
Linux ubuntu 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023
x86_64 x86_64 x86_64 GNU/Linux
*******************************************************************************
gcc version:
$ gcc -v
Using built-in specs.
COLLECT_GCC=/root/gcc_set/202311291030/bin/gcc
COLLECT_LTO_WRAPPER=/root/gcc_set/202311291030/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/root/gcc_set/202311291030
--with-gmp=/root/build_essential --with-mpfr=/root/build_essential
--with-mpc=/root/build_essential --enable-languages=c,c++ --disable-multilib
--with-sanitizer=address,undefined,thread,leak
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20231129 (experimental) (GCC) 

git version: 99fa0bfd63d97825c4221dcd3123940f1d0e6291
*******************************************************************************
Program:
$ cat mutant.c
long a, f;
int b, c, d, g, h, i, j;
char e;
void k(long, int l, char t) {
  char m = b, n = g, o = 0;
  int p, q, r = h;
  long s = g;
  if (f) {
    q = t + (float)16777217;
    o = ~0;
  }
  if (e) {
    d = g + a;
    if (d % (a % l)) {
      p = d;
      n = b;
    }
    if (l) {
      i = b;
      r = a;
      p = h;
    }
    if (s)
      s = q;
    c = f;
    e += t;
    a = p;
  }
  j = r % n;
  s += g / 0xc000000000000000 + !o;
}

*******************************************************************************
Compiler explorer: 
Command Lines:
$ gcc -Oz -frounding-math -fno-dce -fno-trapping-math -fno-tree-dce
-fno-tree-dse -g mutant.c
during RTL pass: reload
mutant.c: In function ‘k’:
mutant.c:31:1: internal compiler error: in lra_eliminate_regs_1, at
lra-eliminations.cc:670
   31 | }
      | ^
0x7bbb24 lra_eliminate_regs_1(rtx_insn*, rtx_def*, machine_mode, bool, bool,
poly_int<1u, long>, bool)
        ../../gcc/gcc/lra-eliminations.cc:670
0xe38f0e lra_eliminate_regs_1(rtx_insn*, rtx_def*, machine_mode, bool, bool,
poly_int<1u, long>, bool)
        ../../gcc/gcc/lra-eliminations.cc:446
0xe38c08 lra_eliminate_regs_1(rtx_insn*, rtx_def*, machine_mode, bool, bool,
poly_int<1u, long>, bool)
        ../../gcc/gcc/lra-eliminations.cc:613
0xe396c4 eliminate_regs_in_insn(rtx_insn*, bool, bool, poly_int<1u, long>)
        ../../gcc/gcc/lra-eliminations.cc:1046
0xe3a029 process_insn_for_elimination
        ../../gcc/gcc/lra-eliminations.cc:1375
0xe3a029 lra_eliminate(bool, bool)
        ../../gcc/gcc/lra-eliminations.cc:1473
0xe1d759 lra(_IO_FILE*)
        ../../gcc/gcc/lra.cc:2553
0xdd3241 do_reload
        ../../gcc/gcc/ira.cc:5973
0xdd3241 execute
        ../../gcc/gcc/ira.cc:6161
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Also ICE on trunk, compiler explorer: https://godbolt.org/z/39PEKqEzc