[Bug target/79907] New: ICE in extract_constrain_insn, at recog.c:2213 on ppc64le

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79907

            Bug ID: 79907
           Summary: ICE in extract_constrain_insn, at recog.c:2213 on
                    ppc64le
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---
            Target: ppc64le-linux-gnu

We ICE on:

$ ppc64le-linux-gnu-gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-convmaxconv-1.c -Ofast
-mno-upper-regs-df
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-convmaxconv-1.c: In
function ‘foo’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-convmaxconv-1.c:13:1:
error: insn does not satisfy its constraints:
 }
 ^
(insn 479 478 140 20 (set (reg:DI 9 9)
        (reg:DI 77 0)) 583 {*movdi_internal64}
     (expr_list:REG_DEAD (reg:DI 77 0)
        (nil)))
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-convmaxconv-1.c:13:1:
internal compiler error: in extract_constrain_insn, at recog.c:2213
0xb085a8 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        .././../gcc/rtl-error.c:108
0xb085cf _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        .././../gcc/rtl-error.c:119
0xadaf77 extract_constrain_insn(rtx_insn*)
        .././../gcc/recog.c:2213
0xade6c3 copyprop_hardreg_forward_1
        .././../gcc/regcprop.c:794
0xadf50f execute
        .././../gcc/regcprop.c:1301