[Bug target/63965] [5 Regression] ICE: in extract_constrain_insn, at recog.c:2230 on ppc64

[pthaugen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63965

--- Comment #3 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
Created attachment 34043
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34043&action=edit
reduced testcase

Another example of error, from CPU2000 benchmark 188.ammp. Compiled with 'gcc
-c -m32 -O2 -mcpu=power7 -ffast-math unonbon.c'.

unonbon.c:63:1: error: insn does not satisfy its constraints:
 }
 ^
(insn 140 88 272 4 (set (reg:DF 108 31 [374])
        (mem/u/c:DF (lo_sum:SI (reg:SI 9 9 [377])
                (symbol_ref/u:SI ("*.LC1") [flags 0x82])) [2  S8 A64])) 466
{*movdf_hardfloat32}
     (expr_list:REG_EQUIV (const_double:DF 1.0e+0 [0x0.8p+1])
        (nil)))
unonbon.c:63:1: internal compiler error: in extract_constrain_insn, at
recog.c:2230
0x106df363 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
    /home/pthaugen/src/gcc/trunk/gcc/gcc/rtl-error.c:110
0x106df3bb _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
    /home/pthaugen/src/gcc/trunk/gcc/gcc/rtl-error.c:121
0x106a5e6f extract_constrain_insn(rtx_insn*)
    /home/pthaugen/src/gcc/trunk/gcc/gcc/recog.c:2230
0x10680a83 reload_cse_simplify_operands
    /home/pthaugen/src/gcc/trunk/gcc/gcc/postreload.c:415
0x10681b4b reload_cse_simplify
    /home/pthaugen/src/gcc/trunk/gcc/gcc/postreload.c:134
0x10681b4b reload_cse_regs_1
    /home/pthaugen/src/gcc/trunk/gcc/gcc/postreload.c:231
0x106834cb reload_cse_regs
    /home/pthaugen/src/gcc/trunk/gcc/gcc/postreload.c:79
0x106834cb execute
    /home/pthaugen/src/gcc/trunk/gcc/gcc/postreload.c:2352
Please submit a full bug report,