[Bug c/104644] New: [12 Regression] ICE: SIGSEGV (infinite recursion in fold_binary_loc / fold_build2_loc / generic_simplify_NE_EXPR)

["zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104644

            Bug ID: 104644
           Summary: [12 Regression] ICE: SIGSEGV (infinite recursion in
                    fold_binary_loc / fold_build2_loc /
                    generic_simplify_NE_EXPR)
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 52493
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52493&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc testcase.c -wrapper valgrind,-q
testcase.c: In function 'foo':
testcase.c:4:29: warning: overflow in conversion from 'float' to 'short
unsigned int' changes value from '1.31072e+5f' to '65535' [-Woverflow]
    4 |   return __builtin_bswap16 ((float) 0x20000) != (char) (float) 0x20000;
      |                             ^~~~~~~~~~~~~~~
==21462== Stack overflow in thread #1: can't grow stack to 0x1ffe001000
==21462== Can't extend stack to 0x1ffe000e48 during signal delivery for thread
1:
==21462==   no stack segment
==21462== 
==21462== Process terminating with default action of signal 11 (SIGSEGV)
==21462==  Access not within mapped region at address 0x1FFE000E48
==21462== Stack overflow in thread #1: can't grow stack to 0x1ffe001000
==21462==    at 0xE22224: ggc_internal_alloc(unsigned long, void (*)(void*),
unsigned long, unsigned long) (ggc-page.cc:1278)
==21462==  If you believe this happened as a result of a stack
==21462==  overflow in your program's main thread (unlikely but
==21462==  possible), you can try to increase the size of the
==21462==  main thread stack using the --main-stacksize= flag.
==21462==  The main thread stack size used in this run was 16777216.
x86_64-pc-linux-gnu-gcc: internal compiler error: Segmentation fault signal
terminated program valgrind
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.


(gdb) bt
#0  generic_simplify_113 (loc=2147483649, type=0x7ffff76c35e8,
captures=0x7ffffbfff090, cmp=NE_EXPR, bswap=CFN_BUILT_IN_BSWAP16, 
    _p1=<optimized out>, _p0=<optimized out>) at generic-match.cc:6558
#1  0x0000000001afd8db in generic_simplify_NE_EXPR (loc=2147483649,
type=0x7ffff76c35e8, _p0=0x7ffff70c7620, _p1=0x7ffff77f2510, 
    code=NE_EXPR) at generic-match.cc:61429
#2  0x0000000000fe500f in fold_binary_loc (loc=2147483649, code=NE_EXPR,
type=0x7ffff76c35e8, op0=0x7ffff70c7620, op1=0x7ffff77f2510)
    at /repo/gcc-trunk/gcc/fold-const.cc:10862
#3  0x0000000000fedb6a in fold_build2_loc (loc=2147483649, code=NE_EXPR,
type=0x7ffff76c35e8, op0=0x7ffff70c7620, op1=0x7ffff77f2510)
    at /repo/gcc-trunk/gcc/fold-const.cc:13814
#4  0x0000000000fedb6a in fold_build2_loc (loc=2147483649, code=NE_EXPR,
type=0x7ffff76c35e8, op0=0x7ffff77f2510, op1=0x7ffff70c7620)
    at /repo/gcc-trunk/gcc/fold-const.cc:13814
#5  0x0000000001afd8db in generic_simplify_NE_EXPR (loc=2147483649,
type=0x7ffff76c35e8, _p0=0x7ffff70c75e8, _p1=0x7ffff77f24f8, 
    code=NE_EXPR) at generic-match.cc:61429
#6  0x0000000000fe500f in fold_binary_loc (loc=2147483649, code=NE_EXPR,
type=0x7ffff76c35e8, op0=0x7ffff70c75e8, op1=0x7ffff77f24f8)
    at /repo/gcc-trunk/gcc/fold-const.cc:10862
#7  0x0000000000fedb6a in fold_build2_loc (loc=2147483649, code=NE_EXPR,
type=0x7ffff76c35e8, op0=0x7ffff70c75e8, op1=0x7ffff77f24f8)
    at /repo/gcc-trunk/gcc/fold-const.cc:13814
#8  0x0000000000fedb6a in fold_build2_loc (loc=2147483649, code=NE_EXPR,
type=0x7ffff76c35e8, op0=0x7ffff77f24f8, op1=0x7ffff70c75e8)
    at /repo/gcc-trunk/gcc/fold-const.cc:13814
#9  0x0000000001afd8db in generic_simplify_NE_EXPR (loc=2147483649,
type=0x7ffff76c35e8, _p0=0x7ffff70c75b0, _p1=0x7ffff77f2510, 
    code=NE_EXPR) at generic-match.cc:61429
...

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-7349-20220222175310-g54f74502327-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r12-7349-20220222175310-g54f74502327-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.1 20220222 (experimental) (GCC)