[Bug target/117657] New: [15 Regression][gcn] ICE during in-tree newlib build: error: unrecognizable insn

[burnus at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117657

            Bug ID: 117657
           Summary: [15 Regression][gcn] ICE during in-tree newlib build:
                    error: unrecognizable insn
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: build, ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: ams at gcc dot gnu.org
  Target Milestone: ---
            Target: gcn

Created attachment 59620
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59620&action=edit
C testcase, compile with gcn cc1 and -O2 (-march does not matter)

Build fails as follows.
Original failing file is 'newlib/libc/string/strcasestr.c '

Reduced testcase attached, compile with:
   ./gcc/cc1 -fpreprocessed -march=gfx900 -O2 input3.i

* * *

 <simdclone> {heap 1720k} two_way_long_needleinput3.i: In function
‘two_way_long_needle’:
input3.i:19:1: error: unrecognizable insn:
   19 | }
      | ^
(insn 88 87 89 15 (set (reg:V64QI 696 [ vect_patt_45.10 ])
        (vec_merge:V64QI (unspec:V64QI [
                    (plus:V64DI (reg:V64DI 750)
                        (vec_duplicate:V64DI (const_int 0 [0])))
                    (const_int 0 [0])
                    (unspec:V64QI [
                            (const_int 0 [0])
                        ] UNSPEC_VECTOR)
                    (mem:BLK (scratch) [0  A8])
                ] UNSPEC_GATHER)
            (reg:V64QI 696 [ vect_patt_45.10 ])
            (reg:DI 689 [ loop_mask_50 ]))) -1
     (nil))
during RTL pass: vregs
input3.i:19:1: internal compiler error: in extract_insn, at recog.cc:2882
0x208e645 internal_error(char const*, ...)
       
/net/carlos/srv/data/tburnus/repos/gcc/gcc/diagnostic-global-context.cc:518
0x98795c fancy_abort(char const*, int, char const*)
        /net/carlos/srv/data/tburnus/repos/gcc/gcc/diagnostic.cc:1696
0x829b2b _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /net/carlos/srv/data/tburnus/repos/gcc/gcc/rtl-error.cc:109
0x829b4d _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /net/carlos/srv/data/tburnus/repos/gcc/gcc/rtl-error.cc:117
0x8285e6 extract_insn(rtx_insn*)