[Bug target/83409] New: arc: "internal compiler error: in extract_constrain_insn" with -O3

["arnd at linaro dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83409

            Bug ID: 83409
           Summary: arc: "internal compiler error: in
                    extract_constrain_insn" with -O3
           Product: gcc
           Version: 7.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: arnd at linaro dot org
  Target Milestone: ---

Created attachment 42870
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42870&action=edit
linux/lib/scatterlist.c, preprocessed and compressed

I get several internal compiler errors building linux 'allmodconfig' with
arc-elf-gcc-7.2.1:

/home/arnd/cross-gcc/bin/arc-elf-gcc-7.2.1 -Wall -O3 -c lib/scatterlist.i
-fno-strict-aliasing

/git/arm-soc/lib/scatterlist.c: In function '__sg_alloc_table_from_pages':
/git/arm-soc/lib/scatterlist.c:445:1: error: insn does not satisfy its
constraints:
 }
 ^
(insn 735 249 620 23 (set (reg:SI 60 lp_count [477])
        (plus:SI (mult:SI (reg:SI 60 lp_count [375])
                (const_int 4 [0x4]))
            (const_int -20 [0xffffffffffffffec])))
"/git/arm-soc/lib/scatterlist.c":139 89 {*add_n}
     (nil))
/git/arm-soc/lib/scatterlist.c:445:1: internal compiler error: in
extract_constrain_insn, at recog.c:2213
0x95a673 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/arnd/git/gcc/gcc/rtl-error.c:108
0x95a69f _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/arnd/git/gcc/gcc/rtl-error.c:119
0x927aad extract_constrain_insn(rtx_insn*)
        /home/arnd/git/gcc/gcc/recog.c:2213
0x92adf4 copyprop_hardreg_forward_1
        /home/arnd/git/gcc/gcc/regcprop.c:801
0x92bad7 execute
        /home/arnd/git/gcc/gcc/regcprop.c:1308
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