[Bug target/113184] New: [14 Regression] ICE: in extract_insn, at recog.cc:2812 (unrecognizable insn) with -O -frounding-math -fnon-call-exceptions

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113184

            Bug ID: 113184
           Summary: [14 Regression] ICE: in extract_insn, at recog.cc:2812
                    (unrecognizable insn) with -O -frounding-math
                    -fnon-call-exceptions
           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: aarch64-unknown-linux-gnu

Created attachment 56969
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56969&action=edit
reduced testcase

Compiler output:
$ aarch64-unknown-linux-gnu-gcc -O -frounding-math -fnon-call-exceptions
testcase.c
testcase.c: In function 'foo':
testcase.c:7:1: error: unrecognizable insn:
    7 | }
      | ^
(insn 43 0 0 (set (reg:DI 120)
        (subreg:DI (float:DF (reg:DI 114)) 0)) -1
     (nil))
during RTL pass: reload
testcase.c:7:1: internal compiler error: in extract_insn, at recog.cc:2812
0x85ed33 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.cc:108
0x85edb0 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /repo/gcc-trunk/gcc/rtl-error.cc:116
0x84fdd1 extract_insn(rtx_insn*)
        /repo/gcc-trunk/gcc/recog.cc:2812
0x10d94c0 ira_remove_insn_scratches(rtx_insn*, bool, _IO_FILE*, rtx_def*
(*)(rtx_def*))
        /repo/gcc-trunk/gcc/ira.cc:5381
0x112325d remove_insn_scratches
        /repo/gcc-trunk/gcc/lra.cc:2154
0x112325d lra_emit_move(rtx_def*, rtx_def*)
        /repo/gcc-trunk/gcc/lra.cc:513
0x113be18 curr_insn_transform
        /repo/gcc-trunk/gcc/lra-constraints.cc:4669
0x113dc37 lra_constraints(bool)
        /repo/gcc-trunk/gcc/lra-constraints.cc:5414
0x11267a4 lra(_IO_FILE*, int)
        /repo/gcc-trunk/gcc/lra.cc:2442
0x10d477f do_reload
        /repo/gcc-trunk/gcc/ira.cc:5973
0x10d477f execute
        /repo/gcc-trunk/gcc/ira.cc:6161
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.

$ aarch64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-aarch64/bin/aarch64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-6868-20231230002732-g77f30e22f17-checking-yes-rtl-df-extra-aarch64/bin/../libexec/gcc/aarch64-unknown-linux-gnu/14.0.0/lto-wrapper
Target: aarch64-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/aarch64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=aarch64-unknown-linux-gnu
--with-ld=/usr/bin/aarch64-unknown-linux-gnu-ld
--with-as=/usr/bin/aarch64-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-6868-20231230002732-g77f30e22f17-checking-yes-rtl-df-extra-aarch64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231230 (experimental) (GCC)