[Bug target/117608] New: [15 Regression] ICE: in extract_insn, at recog.cc:2882 (unrecognizable insn) with __builtin_ia32_prefetch(0, 2, 0, 0)

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117608

            Bug ID: 117608
           Summary: [15 Regression] ICE: in extract_insn, at recog.cc:2882
                    (unrecognizable insn) with __builtin_ia32_prefetch(0,
                    2, 0, 0)
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          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

Compiler output:

$ cat testcase.c 
void foo() { __builtin_ia32_prefetch(0, 2, 0, 0); }

$ x86_64-pc-linux-gnu-gcc testcase.c 
testcase.c: In function 'foo':
testcase.c:1:51: error: unrecognizable insn:
    1 | void foo() { __builtin_ia32_prefetch(0, 2, 0, 0); }
      |                                                   ^
(insn 5 2 0 2 (prefetch (const_int 0 [0])
        (const_int 2 [0x2])
        (const_int 0 [0])) "testcase.c":1:14 -1
     (nil))
during RTL pass: vregs
testcase.c:1:51: internal compiler error: in extract_insn, at recog.cc:2882
0x2cc02ee internal_error(char const*, ...)
        /repo/gcc-trunk/gcc/diagnostic-global-context.cc:518
0xe85c69 fancy_abort(char const*, int, char const*)
        /repo/gcc-trunk/gcc/diagnostic.cc:1696
0x83bb53 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.cc:109
0x83bbd0 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /repo/gcc-trunk/gcc/rtl-error.cc:117
0x82a953 extract_insn(rtx_insn*)
        /repo/gcc-trunk/gcc/recog.cc:2882
0x11e7d6f instantiate_virtual_regs_in_insn
        /repo/gcc-trunk/gcc/function.cc:1661
0x11e7d6f instantiate_virtual_regs
        /repo/gcc-trunk/gcc/function.cc:1995
0x11e7d6f execute
        /repo/gcc-trunk/gcc/function.cc:2042
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ 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-r15-5311-20241115090525-ge5050819808-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/15.0.0/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 --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r15-5311-20241115090525-ge5050819808-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20241115 (experimental) (GCC)