[Bug target/94538] New: [9/10 Regression] ICE: in extract_constrain_insn_cached, at recog.c:2223 (insn does not satisfy its constraints) with -mcpu=cortex-m23 -mslow-flash-data

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94538

            Bug ID: 94538
           Summary: [9/10 Regression] ICE: in
                    extract_constrain_insn_cached, at recog.c:2223 (insn
                    does not satisfy its constraints) with
                    -mcpu=cortex-m23 -mslow-flash-data
           Product: gcc
           Version: 10.0
            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: armv7a-hardfloat-linux-gnueabi

Created attachment 48247
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48247&action=edit
reduced testcase

Compiler output:
$ armv7a-hardfloat-linux-gnueabi-gcc -mcpu=cortex-m23 -mslow-flash-data
testcase.c
testcase.c: In function 'foo':
testcase.c:9:1: error: insn does not satisfy its constraints:
    9 | }
      | ^
(insn 91 90 17 (set (reg:SI 12 ip [128])
        (plus:SI (reg:SI 12 ip [128])
            (const_int 255 [0xff]))) "testcase.c":8:5 905 {*thumb1_addsi3}
     (expr_list:REG_EQUAL (const_int 4095 [0xfff])
        (nil)))
during RTL pass: shorten
testcase.c:9:1: internal compiler error: in extract_constrain_insn_cached, at
recog.c:2207
0x6f8802 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.c:108
0x6f888f _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /repo/gcc-trunk/gcc/rtl-error.c:118
0x6e9a7e extract_constrain_insn_cached(rtx_insn*)
        /repo/gcc-trunk/gcc/recog.c:2207
0x166862f insn_default_length(rtx_insn*)
        /repo/gcc-trunk/gcc/config/arm/arm.md:363
0xcb4c3e shorten_branches(rtx_insn*)
        /repo/gcc-trunk/gcc/final.c:1118
0xcb4d0f rest_of_handle_shorten_branches
        /repo/gcc-trunk/gcc/final.c:4753
0xcb4d0f execute
        /repo/gcc-trunk/gcc/final.c:4782
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ armv7a-hardfloat-linux-gnueabi-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-armv7a-hardfloat/bin/armv7a-hardfloat-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r10-7640-20200408212358-gd0cc1b79b39-checking-yes-rtl-df-extra-armv7a-hardfloat/bin/../libexec/gcc/armv7a-hardfloat-linux-gnueabi/10.0.1/lto-wrapper
Target: armv7a-hardfloat-linux-gnueabi
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-float=hard --with-fpu=vfpv4
--with-arch=armv7-a --with-sysroot=/usr/armv7a-hardfloat-linux-gnueabi
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=armv7a-hardfloat-linux-gnueabi
--with-ld=/usr/bin/armv7a-hardfloat-linux-gnueabi-ld
--with-as=/usr/bin/armv7a-hardfloat-linux-gnueabi-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r10-7640-20200408212358-gd0cc1b79b39-checking-yes-rtl-df-extra-armv7a-hardfloat
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200408 (experimental) (GCC)