[Bug c/100817] New: ICE with -O2: in compute_antic, at tree-ssa-pre.c:2513

[cnsun at uwaterloo dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100817

            Bug ID: 100817
           Summary: ICE with -O2: in compute_antic, at tree-ssa-pre.c:2513
           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.EknlexSzGF-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 20210528 (experimental) [master revision
:0e2d976f7:cd62d089f6021fd1ad4537b8182836d15b14514f] (GCC)

$ cat mutant.c
a;
__attribute__((cold)) b ()
{
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for (; a; a += 2)
;
}

$ gcc-trunk -O2 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:2:23: warning: return type defaults to ‘int’ [-Wimplicit-int]
    2 | __attribute__((cold)) b ()
      |                       ^
during GIMPLE pass: pre
mutant.c: In function ‘b’:
mutant.c:2:23: internal compiler error: in compute_antic, at
tree-ssa-pre.c:2513
0x7920a1 compute_antic
        /tmp/tmp.EknlexSzGF-gcc-builder/gcc/gcc/tree-ssa-pre.c:2513
0x7920a1 execute
        /tmp/tmp.EknlexSzGF-gcc-builder/gcc/gcc/tree-ssa-pre.c:4384
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.