[Bug target/116505] New: ICE: in gen_reg_rtx, at emit-rtl.cc:1177 with -O -fprofile-arcs -fprofile-values -flate-combine-instructions on powerpc64le with basic code

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116505

            Bug ID: 116505
           Summary: ICE: in gen_reg_rtx, at emit-rtl.cc:1177 with -O
                    -fprofile-arcs -fprofile-values
                    -flate-combine-instructions on powerpc64le with basic
                    code
           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: powerpc64le-unknown-linux-gnu

Output:
$ cat testcase.c 
void foo() {}
$ powerpc64le-unknown-linux-gnu-gcc -O -fprofile-arcs -fprofile-values
-flate-combine-instructions testcase.c 
during RTL pass: split2
testcase.c: In function 'foo':
testcase.c:1:13: internal compiler error: in gen_reg_rtx, at emit-rtl.cc:1177
    1 | void foo() {}
      |             ^
0x1fd5e2e internal_error(char const*, ...)
        /repo/gcc-trunk/gcc/diagnostic-global-context.cc:491
0x9dffc5 fancy_abort(char const*, int, char const*)
        /repo/gcc-trunk/gcc/diagnostic.cc:1772
0x6ba3fa gen_reg_rtx(machine_mode)
        /repo/gcc-trunk/gcc/emit-rtl.cc:1177
0x1b83879 gen_split_394(rtx_insn*, rtx_def**)
        /repo/gcc-trunk/gcc/config/rs6000/rs6000.md:10773
0x1cc43ea split_17
        /repo/gcc-trunk/gcc/config/rs6000/rs6000.md:490
0xc86ddd try_split(rtx_def*, rtx_insn*, int)
        /repo/gcc-trunk/gcc/emit-rtl.cc:3941
0x1056558 split_insn
        /repo/gcc-trunk/gcc/recog.cc:3475
0x105d625 split_all_insns()
        /repo/gcc-trunk/gcc/recog.cc:3579
0x105d748 execute
        /repo/gcc-trunk/gcc/recog.cc:4503
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.

$ powerpc64le-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-powerpc64le/bin/powerpc64le-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r15-3187-20240826023505-g53b86cac7e7-checking-yes-rtl-df-extra-powerpc64le/bin/../libexec/gcc/powerpc64le-unknown-linux-gnu/15.0.0/lto-wrapper
Target: powerpc64le-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl
--with-sysroot=/usr/powerpc64le-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=powerpc64le-unknown-linux-gnu
--with-ld=/usr/bin/powerpc64le-unknown-linux-gnu-ld
--with-as=/usr/bin/powerpc64le-unknown-linux-gnu-as --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r15-3187-20240826023505-g53b86cac7e7-checking-yes-rtl-df-extra-powerpc64le
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20240826 (experimental) (GCC)