[Bug target/114442] New: ICE: in riscv_sched_variable_issue, at config/riscv/riscv.cc:8421 with -O2 -mtune=xiangshan-nanhu

[Bug target/114442] New: ICE: in riscv_sched_variable_issue, at config/riscv/riscv.cc:8421 with -O2 -mtune=xiangshan-nanhu

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114442

            Bug ID: 114442
           Summary: ICE: in riscv_sched_variable_issue, at
                    config/riscv/riscv.cc:8421 with -O2
                    -mtune=xiangshan-nanhu
           Product: gcc
           Version: 14.0
            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: riscv64-unknown-linux-gnu

Created attachment 57787
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57787&action=edit
reduced testcase

Compiler output:
$ riscv64-unknown-linux-gnu-gcc -O2 -mtune=xiangshan-nanhu testcase.c 
during RTL pass: sched2
testcase.c: In function 'foo':
testcase.c:1:18: internal compiler error: in riscv_sched_variable_issue, at
config/riscv/riscv.cc:8421
    1 | void foo (void) {}
      |                  ^
0xb84f66 riscv_sched_variable_issue
        /repo/gcc-trunk/gcc/config/riscv/riscv.cc:8421
0xb84f66 riscv_sched_variable_issue
        /repo/gcc-trunk/gcc/config/riscv/riscv.cc:8401
0x2a4205e schedule_block(basic_block_def**, void*)
        /repo/gcc-trunk/gcc/haifa-sched.cc:6912
0x16b4f74 schedule_region
        /repo/gcc-trunk/gcc/sched-rgn.cc:3203
0x16b4f74 schedule_insns()
        /repo/gcc-trunk/gcc/sched-rgn.cc:3525
0x16b540d schedule_insns()
        /repo/gcc-trunk/gcc/sched-rgn.cc:3511
0x16b540d rest_of_handle_sched2
        /repo/gcc-trunk/gcc/sched-rgn.cc:3749
0x16b540d execute
        /repo/gcc-trunk/gcc/sched-rgn.cc:3888
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.

$ riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-riscv64/bin/riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-9644-20240323110757-g543585046d1-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/14.0.1/lto-wrapper
Target: riscv64-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-isa-spec=2.2
--with-sysroot=/usr/riscv64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=riscv64-unknown-linux-gnu
--with-ld=/usr/bin/riscv64-unknown-linux-gnu-ld
--with-as=/usr/bin/riscv64-unknown-linux-gnu-as --disable-multilib
--enable-libsanitizer --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-9644-20240323110757-g543585046d1-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240323 (experimental) (GCC)