[Bug c/100528] New: ICE: tree check: expected string_cst, have plus_expr in get_attr_len, at multiple_target.c:198

[cnsun at uwaterloo dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100528

            Bug ID: 100528
           Summary: ICE: tree check: expected string_cst, have plus_expr
                    in get_attr_len, at multiple_target.c:198
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cnsun at uwaterloo dot ca
  Target Milestone: ---

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/scratch/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /tmp/tmp.FUbEknNORK-gcc-builder/gcc/configure
--enable-languages=c,c++,lto --enable-checking-yes --enable-multiarch
--prefix=/scratch/software/gcc-trunk --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20210511 (experimental) [master revision
:7db32cac8:aa891c56f25baac94db004e309d1b6e40b770a95] (GCC)

$ cat mutant.c
a;
__attribute__((target_clones(a + 0x12345U))) fast_clamp() {}

$ gcc-trunk -O0 mutant.c
mutant.c:1:1: warning: data definition has no type or storage class
    1 | a;
      | ^
mutant.c:1:1: warning: type defaults to ‘int’ in declaration of ‘a’
[-Wimplicit-int]
mutant.c:2:46: warning: return type defaults to ‘int’ [-Wimplicit-int]
    2 | __attribute__((target_clones(a + 0x12345U))) fast_clamp() {}
      |                                              ^~~~~~~~~~
during IPA pass: targetclone
mutant.c:2:1: internal compiler error: tree check: expected string_cst, have
plus_expr in get_attr_len, at multiple_target.c:198
    2 | __attribute__((target_clones(a + 0x12345U))) fast_clamp() {}
      | ^~~~~~~~~~~~~
0x7bca06 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/tree.c:8674
0x89f978 tree_check(tree_node*, char const*, int, char const*, tree_code)
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/tree.h:3356
0x89f978 get_attr_len
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/multiple_target.c:198
0x89f978 expand_target_clones
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/multiple_target.c:344
0x89f978 ipa_target_clone
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/multiple_target.c:517
0x89f978 execute
        /tmp/tmp.FUbEknNORK-gcc-builder/gcc/gcc/multiple_target.c:553
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.