[Bug other/79295] New: [7 regression] gcc.target/powerpc/bcd-3.c fails starting with r244942

["seurer at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79295

            Bug ID: 79295
           Summary: [7 regression] gcc.target/powerpc/bcd-3.c fails
                    starting with r244942
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

Causes an ICE

spawn /home/seurer/gcc/build/gcc-test/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test/gcc/
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.target/powerpc/bcd-3.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -mcpu=power8 -O2
-ffat-lto-objects -S -o bcd-3.s
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.target/powerpc/bcd-3.c: In function
'do_add_lt':
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.target/powerpc/bcd-3.c:34:1: error:
insn does not satisfy its constraints:
(insn 44 3 13 2 (parallel [
            (set (reg/v:V1TI 32 0 [orig:156 <retval> ] [156])
                (unspec:V1TI [
                        (reg/v:V1TI 77 0 [orig:157 a ] [157])
                        (reg/v:V1TI 78 1 [orig:158 b ] [158])
                        (const_int 0 [0])
                    ] UNSPEC_BCDADD))
            (set (reg:CCFP 74 6)
                (compare:CCFP (unspec:V2DF [
                            (reg/v:V1TI 77 0 [orig:157 a ] [157])
                            (reg/v:V1TI 78 1 [orig:158 b ] [158])
                            (const_int 0 [0])
                        ] UNSPEC_BCDADD)
                    (const_vector:V2DF [
                            (const_double:DF 0.0 [0x0.0p+0])
                            (const_double:DF 0.0 [0x0.0p+0])
                        ])))
        ])
"/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.target/powerpc/bcd-3.c":30 1753
{*bcdadd_test2}
     (nil))
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.target/powerpc/bcd-3.c:34:1:
internal compiler error: in extract_constrain_insn, at recog.c:2213
0x108a9b13 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/seurer/gcc/gcc-test/gcc/rtl-error.c:108
0x108a9b6b _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/seurer/gcc/gcc-test/gcc/rtl-error.c:119
0x1086fa67 extract_constrain_insn(rtx_insn*)
        /home/seurer/gcc/gcc-test/gcc/recog.c:2213
0x10874e1f copyprop_hardreg_forward_1
        /home/seurer/gcc/gcc-test/gcc/regcprop.c:794
0x10875eb7 execute
        /home/seurer/gcc/gcc-test/gcc/regcprop.c:1301