Description of problem:

$ gcc t-rand.c 
t-rand.c: In function ‘main’:
t-rand.c:5:1: error: unrecognizable insn:
    5 | }
      | ^
(insn 8 7 9 2 (parallel [
            (set (reg:DI 94)
                (unspec_volatile:DI [
                        (const_int 0 [0])
                    ] UNSPEC_RNDR))
            (set (reg:CC_Z 66 cc)
                (unspec_volatile:CC_Z [
                        (const_int 0 [0])
                    ] UNSPEC_RNDR))
        ]) "t-rand.c":3:3 -1
     (nil))
during RTL pass: vregs
t-rand.c:5:1: internal compiler error: in extract_insn, at recog.cc:2791

Version-Release number of selected component (if applicable):

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/aarch64-redhat-linux/12/lto-wrapper
Target: aarch64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-12.2.1-20221121/obj-aarch64-redhat-linux/isl-install --enable-gnu-indirect-function --build=aarch64-redhat-linux --with-build-config=bootstrap-lto --enable-link-serialization=1
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.1 20221121 (Red Hat 12.2.1-4) (GCC) 

How reproducible:

$ cat t-rand.c 
int main (int argc, char *argv[]) {
  unsigned long v;
  __builtin_aarch64_rndr (&v);
  return 0;
}