[Bug target/106815] New: [13 Regression] ICE: in riscv_excess_precision, at config/riscv/riscv.cc:5967 with -fexcess-precision=16 on any input

["zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106815

            Bug ID: 106815
           Summary: [13 Regression] ICE: in riscv_excess_precision, at
                    config/riscv/riscv.cc:5967 with -fexcess-precision=16
                    on any input
           Product: gcc
           Version: 13.0
            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

Compiler output (empty testcase.c):
$ echo '' > testcase.c
$ riscv64-unknown-linux-gnu-gcc -fexcess-precision=16 testcase.c
<built-in>: internal compiler error: in riscv_excess_precision, at
config/riscv/riscv.cc:5967
0x7ada41 riscv_excess_precision
        /repo/gcc-trunk/gcc/config/riscv/riscv.cc:5967
0x7ada41 riscv_excess_precision
        /repo/gcc-trunk/gcc/config/riscv/riscv.cc:5956
0x94a206 c_ts18661_flt_eval_method
        /repo/gcc-trunk/gcc/c-family/c-common.cc:8939
0x98484a c_cpp_builtins(cpp_reader*)
        /repo/gcc-trunk/gcc/c-family/c-cppbuiltin.cc:1223
0x99fec7 c_finish_options
        /repo/gcc-trunk/gcc/c-family/c-opts.cc:1496
0x9a28b0 c_common_parse_file()
        /repo/gcc-trunk/gcc/c-family/c-opts.cc:1249
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-r13-2374-20220902172530-gd72ca12b846-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/13.0.0/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-r13-2374-20220902172530-gd72ca12b846-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.0.0 20220902 (experimental) (GCC)