[Bug rtl-optimization/56117] New: [4.8 Regression] ICE: in cselib_subst_to_values, at cselib.c:1853 with -O2 -fsched2-use-superblocks and __builtin_prefetch()

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56117



             Bug #: 56117

           Summary: [4.8 Regression] ICE: in cselib_subst_to_values, at

                    cselib.c:1853 with -O2 -fsched2-use-superblocks and

                    __builtin_prefetch()

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: rtl-optimization

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: zso...@seznam.cz





Created attachment 29278

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29278

reduced testcase



Compiler output:

$ gcc -O2 -fsched2-use-superblocks testcase.c         

testcase.c: In function 'foo':

testcase.c:4:1: internal compiler error: in cselib_subst_to_values, at

cselib.c:1853

 }

 ^

0x6d6874 cselib_subst_to_values(rtx_def*, machine_mode)

        /mnt/svn/gcc-trunk/gcc/cselib.c:1853

0x6d6cf9 cselib_subst_to_values_from_insn(rtx_def*, machine_mode, rtx_def*)

        /mnt/svn/gcc-trunk/gcc/cselib.c:1945

0x1149dbf add_insn_mem_dependence

        /mnt/svn/gcc-trunk/gcc/sched-deps.c:1739

0x1150266 sched_analyze_2

        /mnt/svn/gcc-trunk/gcc/sched-deps.c:2724

0x11510ee sched_analyze_insn

        /mnt/svn/gcc-trunk/gcc/sched-deps.c:2899

0x1153b09 deps_analyze_insn(deps_desc*, rtx_def*)

        /mnt/svn/gcc-trunk/gcc/sched-deps.c:3583

0x1154815 sched_analyze(deps_desc*, rtx_def*, rtx_def*)

        /mnt/svn/gcc-trunk/gcc/sched-deps.c:3732

0x11583ea schedule_ebb(rtx_def*, rtx_def*, bool)

        /mnt/svn/gcc-trunk/gcc/sched-ebb.c:514

0x1158e35 schedule_ebbs()

        /mnt/svn/gcc-trunk/gcc/sched-ebb.c:664

0x9cb7f4 rest_of_handle_sched2

        /mnt/svn/gcc-trunk/gcc/sched-rgn.c:3606

Please submit a full bug report,

with preprocessed source if appropriate.

Please include the complete backtrace with any bug report.

See <http://gcc.gnu.org/bugs.html> for instructions.



Tested revisions:

r195477 - crash

r195313 - crash

r192654 - OK

4.7 r194763 - OK