[Bug target/116030] New: ICE "could not split insn" in final_scan_insn_1, at final.cc on power pc

[pheeck at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116030

            Bug ID: 116030
           Summary: ICE "could not split insn" in final_scan_insn_1, at
                    final.cc on power pc
           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: pheeck at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: ppc64le-linux-gnu

Compiling the gcc.dg/dfp/int128-3.c GCC testsuite file with a power pc
crosscompiler like this

ppc64le-linux-gnu-gcc
/home/worker/buildworker/tiber-option-juggler/build/gcc/testsuite/gcc.dg/dfp/int128-3.c
-Os -fno-forward-propagate -ftrivial-auto-var-init=zero

results in an ICE

/home/worker/buildworker/tiber-option-juggler/build/gcc/testsuite/gcc.dg/dfp/int128-3.c:
In function ‘main’:
/home/worker/buildworker/tiber-option-juggler/build/gcc/testsuite/gcc.dg/dfp/int128-3.c:81:1:
error: could not split insn
   81 | }
      | ^
(insn:TI 346 359 25 (set (mem/v/c:V4SI (reg:DI 9 9 [330]) [0 MEM <char[1:16]>
[(void *)&u128]+0 S16 A128])
        (const_vector:V4SI [
                (const_int 0 [0]) repeated x4
            ]))
"/home/worker/buildworker/tiber-option-juggler/build/gcc/testsuite/gcc.dg/dfp/int128-3.c":34:23
1371 {vsx_stxvd2x4_le_const_v4si}
     (expr_list:REG_DEAD (reg:DI 9 9 [330])
        (nil)))
during RTL pass: final
/home/worker/buildworker/tiber-option-juggler/build/gcc/testsuite/gcc.dg/dfp/int128-3.c:81:1:
internal compiler error: in final_scan_insn_1, at final.cc:2807
0x188f93e internal_error(char const*, ...)
       
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/gcc/diagnostic-global-context.cc:491
0x682957 fancy_abort(char const*, int, char const*)
       
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/gcc/diagnostic.cc:1725
0x660a17 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/gcc/rtl-error.cc:108
0x6520ff final_scan_insn_1
       
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/gcc/final.cc:2807
0x8fb968 final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
       
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/gcc/final.cc:2886
0x8fbbf5 final_1
       
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/gcc/final.cc:1977
0x8fc3e6 rest_of_handle_final
       
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/gcc/final.cc:4239
0x8fc3e6 execute
       
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/gcc/final.cc:4317
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.


Compiler configuration:

Using built-in specs.
COLLECT_GCC=/home/worker/cross/bin/ppc64le-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/home/worker/cross/libexec/gcc/ppc64le-linux-gnu/15.0.0/lto-wrapper
Target: ppc64le-linux-gnu
Configured with:
/home/worker/buildworker/tiber-gcc-trunk-ppc64le/build/configure
--enable-languages=c,c++,fortran --disable-bootstrap --disable-libsanitizer
--disable-multilib --enable-checking=release --prefix=/home/worker/cross
--target=ppc64le-linux-gnu --with-as=/usr/bin/powerpc64le-suse-linux-as
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20240721 (experimental)
838999bb23303edc14e96b6034cd837fa4454cfd (GCC)