[Bug target/69171] [6 Regression] error: unrecognizable insn: on x86_64 with -O2

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69171

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-01-06
                 CC|                            |hjl.tools at gmail dot com,
                   |                            |trippels at gcc dot gnu.org
            Summary|error: unrecognizable insn: |[6 Regression] error:
                   |on x86_64 with -O2          |unrecognizable insn: on
                   |                            |x86_64 with -O2
     Ever confirmed|0                           |1

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
trippels@CFARM-IUT-TLSE3 ~ % cat bug261.c
#pragma pack(2)
struct {
  int n;
} a;
float b;
int c;
void fn1() { fn2(c, fn1, b * a.n); }

trippels@CFARM-IUT-TLSE3 ~ % gcc -w -c -O2 bug261.c
bug261.c: In function ‘fn1’:
bug261.c:7:1: error: unrecognizable insn:
 void fn1() { fn2(c, fn1, b * a.n); }
 ^~~~

(insn 18 17 6 2 (set (reg:V4SF 21 xmm0 [93])
        (vec_merge:V4SF (vec_duplicate:V4SF (float:SF (mem/c:SI (symbol_ref:DI
("a") [flags 0x2] <var_decl 0x7fe4517f0cf0 a>) [2 a.n+0 S4 A16])))
            (reg:V4SF 21 xmm0 [93])
            (const_int 1 [0x1]))) bug261.c:7 -1
     (nil))
bug261.c:7:1: internal compiler error: in extract_insn, at recog.c:2286
0xa6541a _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc/gcc/rtl-error.c:108
0xa65449 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../gcc/gcc/rtl-error.c:116
0xa32857 extract_insn(rtx_insn*)
        ../../gcc/gcc/recog.c:2286
0xa328d4 extract_insn_cached(rtx_insn*)
        ../../gcc/gcc/recog.c:2177
0x7f4fed cleanup_subreg_operands(rtx_insn*)
        ../../gcc/gcc/final.c:3103
0xa30037 split_insn
        ../../gcc/gcc/recog.c:2899
0xa34ba7 split_all_insns()
        ../../gcc/gcc/recog.c:2953
0xa34c28 rest_of_handle_split_after_reload
        ../../gcc/gcc/recog.c:3889
0xa34c28 execute
        ../../gcc/gcc/recog.c:3918