[Bug middle-end/68488] New: [6 Regression] internal compiler error: in expand_insn, at optabs.c:6947

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68488

            Bug ID: 68488
           Summary: [6 Regression] internal compiler error: in
                    expand_insn, at optabs.c:6947
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: rsandifo at gcc dot gnu.org
  Target Milestone: ---

On x86-64, r230487 failed to build 189.lucas in SPEC CPU 2000:

gfortran     -O2 -ffast-math -fwhole-program -flto=jobserver
-fuse-linker-plugin -DSPEC_CPU2000_LP64 lucas_distrib_spec.o     -o lucas
lucas_distrib_spec.f90: In function 'lucas_distrib':
lucas_distrib_spec.f90:378:0: internal compiler error: in expand_insn, at
optabs.c:6947
           err_abs=4*dnint(sqrt(1d0*n))


0x9321e3 expand_insn(insn_code, unsigned int, expand_operand*)
        ../../src-trunk/gcc/optabs.c:6947
0x80c2b4 expand_direct_optab_fn
        ../../src-trunk/gcc/internal-fn.c:2124
0x62d00a expand_call_stmt
        ../../src-trunk/gcc/cfgexpand.c:2565
0x62d00a expand_gimple_stmt_1
        ../../src-trunk/gcc/cfgexpand.c:3525
0x62d00a expand_gimple_stmt
        ../../src-trunk/gcc/cfgexpand.c:3688
0x62fbca expand_gimple_basic_block
        ../../src-trunk/gcc/cfgexpand.c:5694
0x635486 execute
        ../../src-trunk/gcc/cfgexpand.c:6309
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with preprocessed source if appropriate.
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make[4]: *** [/tmp/ccRUTyPS.ltrans1.ltrans.o] Error 1
lto-wrapper: fatal error: make returned 2 exit status
compilation terminated.
/usr/local/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status