[Bug target/68973] New: [6 regression] Internal compiler error on power for gcc/testsuite/g++.dg/pr67211.C

[seurer at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68973

            Bug ID: 68973
           Summary: [6 regression] Internal compiler error on power for
                    gcc/testsuite/g++.dg/pr67211.C
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at linux dot vnet.ibm.com
  Target Milestone: ---

This may be a regression of pr67211.  It fails on both big and little endian.

FAIL: g++.dg/pr67211.C  -std=gnu++98 (internal compiler error)
FAIL: g++.dg/pr67211.C  -std=gnu++98 (test for excess errors)
FAIL: g++.dg/pr67211.C  -std=gnu++11 (internal compiler error)
FAIL: g++.dg/pr67211.C  -std=gnu++11 (test for excess errors)
FAIL: g++.dg/pr67211.C  -std=gnu++14 (internal compiler error)
FAIL: g++.dg/pr67211.C  -std=gnu++14 (test for excess errors)


seurer@genoa:~/tests/gcc$ gcc-test -c pr67211.C -mcpu=power7 -mtune=power8 -O3
-w  -std=gnu++11
pr67211.C: In function 'void Linked()':
pr67211.C:50:1: error: insn does not satisfy its constraints:
 }
 ^

(insn 258 153 259 8 (set (reg:DI 9 9)
        (reg/f:DI 63 31 [orig:185 p3$_M_node ] [185])) pr67211.C:28 540
{*movdi_internal64}
     (nil))
pr67211.C:50:1: internal compiler error: in extract_constrain_insn, at
recog.c:2189
0x10a108f3 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/seurer/gcc/gcc-test/gcc/rtl-error.c:108
0x10a1094b _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/seurer/gcc/gcc-test/gcc/rtl-error.c:119
0x109d6b07 extract_constrain_insn(rtx_insn*)
        /home/seurer/gcc/gcc-test/gcc/recog.c:2189
0x109aa467 reload_cse_simplify_operands
        /home/seurer/gcc/gcc-test/gcc/postreload.c:394
0x109abf33 reload_cse_simplify
        /home/seurer/gcc/gcc-test/gcc/postreload.c:180
0x109abf33 reload_cse_regs_1
        /home/seurer/gcc/gcc-test/gcc/postreload.c:219
0x109ad867 reload_cse_regs
        /home/seurer/gcc/gcc-test/gcc/postreload.c:67
0x109ad867 execute
        /home/seurer/gcc/gcc-test/gcc/postreload.c:2336