[Bug target/114139] New: ICE: RTL check: expected code 'const_int', have 'reg' in riscv_macro_fusion_pair_p, at config/riscv/riscv.cc:8438 with -O2 -fpic -mexplicit-relocs -mcpu=sifive-p450

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114139

            Bug ID: 114139
           Summary: ICE: RTL check: expected code 'const_int', have 'reg'
                    in riscv_macro_fusion_pair_p, at
                    config/riscv/riscv.cc:8438 with -O2 -fpic
                    -mexplicit-relocs -mcpu=sifive-p450
           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 57555
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57555&action=edit
reduced testcase

This might need RTL checking enabled to reproduce.

Compiler output:
$ riscv64-unknown-linux-gnu-gcc -O2 -fpic -mexplicit-relocs -mcpu=sifive-p450
testcase.c
during RTL pass: sched2
testcase.c: In function 'foo':
testcase.c:15:1: internal compiler error: RTL check: expected code 'const_int',
have 'reg' in riscv_macro_fusion_pair_p, at config/riscv/riscv.cc:8438
   15 | }
      | ^
0xad7f4d rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
char const*)
        /repo/gcc-trunk/gcc/rtl.cc:770
0xb8ccd4 riscv_macro_fusion_pair_p
        /repo/gcc-trunk/gcc/config/riscv/riscv.cc:8438
0x2b11634 sched_macro_fuse_insns
        /repo/gcc-trunk/gcc/sched-deps.cc:2859
0x2b11634 sched_analyze_insn
        /repo/gcc-trunk/gcc/sched-deps.cc:2898
0x2b12329 deps_analyze_insn(deps_desc*, rtx_insn*)
        /repo/gcc-trunk/gcc/sched-deps.cc:3690
0x2b1541a sched_analyze(deps_desc*, rtx_insn*, rtx_insn*)
        /repo/gcc-trunk/gcc/sched-deps.cc:3843
0x16b24a8 compute_block_dependences
        /repo/gcc-trunk/gcc/sched-rgn.cc:2738
0x16b24a8 sched_rgn_compute_dependencies(int)
        /repo/gcc-trunk/gcc/sched-rgn.cc:3367
0x16b4d48 schedule_region
        /repo/gcc-trunk/gcc/sched-rgn.cc:3139
0x16b4d48 schedule_insns()
        /repo/gcc-trunk/gcc/sched-rgn.cc:3525
0x16b53ed schedule_insns()
        /repo/gcc-trunk/gcc/sched-rgn.cc:3511
0x16b53ed rest_of_handle_sched2
        /repo/gcc-trunk/gcc/sched-rgn.cc:3749
0x16b53ed 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-r14-9189-20240227001746-g1e2a3b278d7-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
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-9189-20240227001746-g1e2a3b278d7-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240227 (experimental) (GCC)