[Bug c/128204] internal compiler error: tree check: expected ssa_name, have var_decl in first_readonly_imm_use, at ssa-iterators.h

Tue, 27 Oct 2026 04:54:35 -0700 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128204

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2026-10-27
           Keywords|                            |ice-on-invalid-code,
                   |                            |ice-on-invalid-fuzzy

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

during GIMPLE pass: forwprop
t.c: In function ‘f’:
t.c:4:5: internal compiler error: tree check: expected ssa_name, have var_decl
in first_readonly_imm_use, at ssa-iterators.h:393
    4 | int f (char *p)
      |     ^
0x3dd7ed8 internal_error(char const*, ...)
        ../../src/gcc/gcc/diagnostic-global-context.cc:787
0x1f82484 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        ../../src/gcc/gcc/tree.cc:9250
0xfe05eb tree_check(tree_node*, char const*, int, char const*, tree_code)
        ../../src/gcc/gcc/tree.h:3837
0x12b84de first_readonly_imm_use(imm_use_iterator*, tree_node*)
        ../../src/gcc/gcc/ssa-iterators.h:393
0x1dfdfc7 use_in_zero_equality(tree_node*, bool)
        ../../src/gcc/gcc/tree-ssa-strlen.cc:3988
0x1cccf18 optimize_strlen_comp
        ../../src/gcc/gcc/tree-ssa-forwprop.cc:2466
0x1ccd245 simplify_builtin_call
        ../../src/gcc/gcc/tree-ssa-forwprop.cc:2519

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