[Bug target/68236] New: [6 Regression] selective scheduling with --param=sched-autopref-queue-depth=10 ICEs a lot @ aarch64

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68236

            Bug ID: 68236
           Summary: [6 Regression] selective scheduling with
                    --param=sched-autopref-queue-depth=10 ICEs a lot @
                    aarch64
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---

Created attachment 36662
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36662&action=edit
testcase

Compiler output:
$ cc1 930506-2.c -Os -fselective-scheduling2
--param=sched-autopref-queue-depth=10
 f1 ___
930506-2.c: In function '___':
930506-2.c:4:17: warning: implicit declaration of function 'foo'
[-Wimplicit-function-declaration]
   { int ___() { foo(1); } bar(___); }
                 ^
930506-2.c: In function 'f1':
930506-2.c:4:27: warning: implicit declaration of function 'bar'
[-Wimplicit-function-declaration]
   { int ___() { foo(1); } bar(___); }
                           ^
 ___ f2 ___ ___
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> <visibility> <build_ssa_passes> <opt_local_passes>
<free-inline-summary> <whole-program> <profile_estimate> <icf> <devirt> <cp>
<targetclone> <inline> <pure-const> <static-var> <single-use>
<comdats>Assembling functions:
 <dispachercalls> ___ ___ ___ ___ f1 f2
930506-2.c: In function 'f2':
930506-2.c:12:1: internal compiler error: RTL check: expected elt 0 type 'e' or
'u', have '1' (rtx fA}) in insn, at rtl.h:1352
 }
 ^
0xa97126 rtl_check_failed_type2(rtx_def const*, int, int, int, char const*,
int, char const*)
        /repo/gcc-trunk/gcc/rtl.c:802
0x562fb1 rtx_insn_list::insn() const
        /repo/gcc-trunk/gcc/rtl.h:1352
0x111707c rtx_insn_list::insn() const
        /repo/gcc-trunk/gcc/rtl.h:1352
0x111707c autopref_multipass_dfa_lookahead_guard(rtx_insn*, int)
        /repo/gcc-trunk/gcc/haifa-sched.c:5879
0xad7afa invoke_dfa_lookahead_guard
        /repo/gcc-trunk/gcc/sel-sched.c:4175
0xad7afa find_best_expr
        /repo/gcc-trunk/gcc/sel-sched.c:4378
0xad7afa fill_insns
        /repo/gcc-trunk/gcc/sel-sched.c:5523
0xad889d schedule_on_fences
        /repo/gcc-trunk/gcc/sel-sched.c:7342
0xad889d sel_sched_region_2
        /repo/gcc-trunk/gcc/sel-sched.c:7480
0xad9b3b sel_sched_region_1
        /repo/gcc-trunk/gcc/sel-sched.c:7522
0xad9b3b sel_sched_region(int)
        /repo/gcc-trunk/gcc/sel-sched.c:7623
0xadb049 run_selective_scheduling()
        /repo/gcc-trunk/gcc/sel-sched.c:7699
0xab4865 rest_of_handle_sched2
        /repo/gcc-trunk/gcc/sched-rgn.c:3625
0xab4865 execute
        /repo/gcc-trunk/gcc/sched-rgn.c:3769
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.


$ xgcc -v
Using built-in specs.
COLLECT_GCC=/repo/build-trunk-229712-checking-yes-rtl-df-nographite-aarch64/gcc/xgcc
Target: aarch64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-checking=yes,rtl,df --without-cloog --without-ppl --without-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=aarch64-unknown-linux-gnu
--with-ld=/usr/bin/aarch64-unknown-linux-gnu-ld
--with-as=/usr/bin/aarch64-unknown-linux-gnu-as --with-sysroot=/chroot/aarch64
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-229712-checking-yes-rtl-df-nographite-aarch64
Thread model: posix
gcc version 6.0.0 20151103 (experimental) (GCC) 


Running the whole (C and C++ testsuite) with:
make -k check
RUNTESTFLAGS="--target_board=unix/-fselective-scheduling/-fselective-scheduling2/--param=sched-autopref-queue-depth=10"
results in many ICEs:

$ find . -name '*.log' | grep -v 'config[.]log' | xargs grep '[Ii]nternal
compiler error:' | grep -v ':FAIL:' | grep -v /pch/ | tr -d '\r' | cut -f5- -d:
| sort | uniq -c | sort -n
      2  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'A' (rtx [Â) in insn, at rtl.h:1352
      2  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'L' (rtx 1ÃÃÃÃÃÃLL$`MÃLÃLÃHÃHÃÃÃÃ) in insn, at rtl.h:1352
      3  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'w' (rtx const_int) in insn, at rtl.h:1352
      3  internal compiler error: Segmentation fault
      3  internal compiler error: RTL check: access of elt 0 of 'return' with
last elt -1 in insn, at rtl.h:1352
      3  internal compiler error: RTL check: access of elt 1 of 'use' with last
elt 0 in next, at rtl.h:1346
      3  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have '1' (rtx JÂÂ) in insn, at rtl.h:1352
      3  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'H' (rtx Âh) in insn, at rtl.h:1352
      3  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'Â' (rtx Â6) in insn, at rtl.h:1352
      6  internal compiler error: in safe_as_a, at is-a.h:205
      6  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have '0' (rtx value) in insn, at rtl.h:1352
      9  internal compiler error: in autopref_multipass_dfa_lookahead_guard, at
haifa-sched.c:5867
     12 
     12  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'i' (rtx address) in insn, at rtl.h:1352
     15  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have '1' (rtx HMÃMÃÃÂ$) in insn, at rtl.h:1352
     18  internal compiler error: RTL check: expected code 'reg', have 'subreg'
in rhs_regno, at rtl.h:1785
     30  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have '1' (rtx 1ÃÃÃÃÃÃLL$`MÃLÃLÃHÃHÃÃÃÃ) in insn, at rtl.h:1352
     37  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have '*' (rtx UnKnown) in insn, at rtl.h:1352
    113  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have '1' (rtx fA}) in insn, at rtl.h:1352
    166  internal compiler error: in operator[], at vec.h:714
    255  internal compiler error: in safe_as_a, at is-a.h:205
    426  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'w' (rtx const_int) in insn, at rtl.h:1352
    659  internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'r' (rtx reg) in insn, at rtl.h:1352
   7898  internal compiler error: in autopref_multipass_dfa_lookahead_guard, at
haifa-sched.c:5867
  22170  internal compiler error: Segmentation fault

Tested revisions:
r229712 - ICE
5-branch r229658 - OK