[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

[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]

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

[Bug rtl-optimization/112875] [14 Regression] 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

[rguenth at gcc dot gnu.org]

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

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vmakarov at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
            Summary|ICE: in                     |[14 Regression] ICE: in
                   |lra_eliminate_regs_1, at    |lra_eliminate_regs_1, at
                   |lra-eliminations.cc:670     |lra-eliminations.cc:670
                   |with -Oz -frounding-math    |with -Oz -frounding-math
                   |-fno-dce -fno-trapping-math |-fno-dce -fno-trapping-math
                   |-fno-tree-dce -fno-tree-dse |-fno-tree-dce -fno-tree-dse
                   |-g                          |-g
   Last reconfirmed|                            |2023-12-06
      Known to work|                            |13.2.1
           Keywords|                            |ice-on-valid-code,
                   |                            |needs-bisection, ra
             Target|                            |x86_64-*-*
     Ever confirmed|0                           |1
   Target Milestone|---                         |14.0
          Component|debug                       |rtl-optimization

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

#1  0x000000000147b8fc in lra_eliminate_regs_1 (insn=0x7ffff7201180, 
    x=0x7ffff7203df0, mem_mode=E_VOIDmode, subst_p=true, update_p=false, 
    update_sp_offset=..., full_p=false)
    at /space/rguenther/src/gcc/gcc/lra-eliminations.cc:670
670        gcc_unreachable ();
(gdb) l
665   return gen_rtx_USE (GET_MODE (x), new_rtx);
666        return x;
667
668      case CLOBBER:
669      case SET:
670        gcc_unreachable ();
671
672      default:
673        break;
674      }
(gdb) p debug_rtx (insn)
(debug_insn 41 40 42 3 (var_location:SI q (fix:SI (plus:SF (float:SF
(sign_extend:SI (mem/c:QI (plus:DI (reg/f:DI 19 frame)
                            (const_int -12 [0xfffffffffffffff4])) [3 %sfp+-12
S1 A32])))
            (clobber:SF (const_int 0 [0]))))) "t.c":9:7 -1
     (nil))

[Bug rtl-optimization/112875] [14 Regression] 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

[jakub at gcc dot gnu.org]

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

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-bisection             |
                 CC|                            |jakub at gcc dot gnu.org
           Priority|P3                          |P1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r14-53-g675b1a7f113adb1d737adaf78b4fd90be7a0ed1a

[Bug rtl-optimization/112875] [14 Regression] 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

[vmakarov at gcc dot gnu.org]

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

--- Comment #3 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Started with r14-53-g675b1a7f113adb1d737adaf78b4fd90be7a0ed1a

I reproduced it and hope to fix it today.

[Bug rtl-optimization/112875] [14 Regression] 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

[cvs-commit at gcc dot gnu.org]

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

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Vladimir Makarov <vmakarov@gcc.gnu.org>:

https://gcc.gnu.org/g:48cb51827c9eb991b92014a3f59d31eb237ce03f

commit r14-6347-g48cb51827c9eb991b92014a3f59d31eb237ce03f
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date:   Fri Dec 8 15:37:42 2023 -0500

    [PR112875][LRA]: Fix an assert in lra elimination code

    PR112875 test ran into a wrong assert (gcc_unreachable) in elimination
    in a debug insn.  The insn seems ok.  So I change the assertion.
    To be more accurate I made it the same as analogous reload pass code.

    gcc/ChangeLog:

            PR rtl-optimization/112875
            * lra-eliminations.cc (lra_eliminate_regs_1): Change an assert.
            Add ASM_OPERANDS case.

    gcc/testsuite/ChangeLog:

            PR rtl-optimization/112875
            * gcc.target/i386/pr112875.c: New test.

[Bug rtl-optimization/112875] [14 Regression] 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

[jakub at gcc dot gnu.org]

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

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.