[Bug bootstrap/64612] New: [5 Regression] profiledbootstrap failures

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64612

            Bug ID: 64612
           Summary: [5 Regression] profiledbootstrap failures
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org

../configure --enable-languages=c,c++ --enable-checking=release
make -j16 profiledbootstrap

ICEs on x86_64-linux while compiling many libgcc routines with the
stagefeedback cc1.
E.g. while compiling _popcountdi2.o (but the backtrace is the same for many
other ICEs):
#0  0x0000000000000000 in ?? ()
#1  0x0000000000eae710 in operator=<std::pair<rtx_def*, machine_mode> > (x=...,
this=0x7fffffffce40) at ../../gcc/wide-int.h:861
#2  simplify_binary_operation_1(rtx_code, machine_mode, rtx_def*, rtx_def*,
rtx_def*, rtx_def*) () at ../../gcc/simplify-rtx.c:2055
#3  0x0000000000eb1778 in simplify_binary_operation (op1=0x7ffff0568fd8,
op0=0x7ffff0568fc0, mode=<optimized out>, code=<optimized out>)
    at ../../gcc/simplify-rtx.c:1975
#4  simplify_gen_binary(rtx_code, machine_mode, rtx_def*, rtx_def*) () at
../../gcc/simplify-rtx.c:203
#5  0x00000000011f28b7 in distribute_and_simplify_rtx(rtx_def*, int) () at
../../gcc/combine.c:9505
#6  0x000000000109937c in combine_simplify_rtx (in_cond=<optimized out>,
in_dest=<optimized out>, op0_mode=DImode, x=0x7ffff05644e0)
    at ../../gcc/combine.c:5844
#7  subst(rtx_def*, rtx_def*, rtx_def*, int, int, int) () at
../../gcc/combine.c:5374
#8  0x0000000001098157 in subst(rtx_def*, rtx_def*, rtx_def*, int, int, int) ()
at ../../gcc/combine.c:5319
#9  0x000000000109861c in subst(rtx_def*, rtx_def*, rtx_def*, int, int, int) ()
at ../../gcc/combine.c:5242
#10 0x000000000109248e in try_combine(rtx_insn*, rtx_insn*, rtx_insn*,
rtx_insn*, int*, rtx_insn*) () at ../../gcc/combine.c:3265
#11 0x000000000108c62a in combine_instructions (nregs=<optimized out>,
f=<optimized out>) at ../../gcc/combine.c:1388
#12 rest_of_handle_combine () at ../../gcc/combine.c:14094
#13 (anonymous namespace)::pass_combine::execute(function*) () at
../../gcc/combine.c:14137
#14 0x0000000000752ec3 in execute_one_pass (pass=0x1b67c80) at
../../gcc/passes.c:2317
#15 0x0000000000754462 in execute_pass_list_1 (pass=0x1b67c80) at
../../gcc/passes.c:2369
#16 0x0000000000754493 in execute_pass_list_1 (pass=0x1b67140) at
../../gcc/passes.c:2370
#17 0x0000000000e58089 in execute_pass_list (fn=0x7ffff0546b28, pass=0x1b63f60)
at ../../gcc/passes.c:2380
#18 0x0000000001159835 in expand (this=0x7ffff053cab8) at
../../gcc/cgraphunit.c:1804
#19 expand_all_functions () at ../../gcc/cgraphunit.c:1940
#20 symbol_table::compile() () at ../../gcc/cgraphunit.c:2293
#21 0x000000000115924e in symbol_table::finalize_compilation_unit() () at
../../gcc/cgraphunit.c:2370
#22 0x0000000000c5345b in c_write_global_declarations() () at
../../gcc/c/c-decl.c:10787
#23 0x000000000119ff42 in compile_file() () at ../../gcc/toplev.c:597
#24 0x0000000000c48541 in do_compile () at ../../gcc/toplev.c:2036
#25 toplev::main(int, char**) () at ../../gcc/toplev.c:2133
#26 0x0000000000c48859 in main (argc=82, argv=0x7fffffffd818) at
../../gcc/main.c:38

(gdb) up
#2  simplify_binary_operation_1(rtx_code, machine_mode, rtx_def*, rtx_def*,
rtx_def*, rtx_def*) () at ../../gcc/simplify-rtx.c:2055
2055                  coeff0 = std::make_pair (XEXP (lhs, 1), mode);
(gdb) disas $pc-32,$pc+32
Dump of assembler code from 0xeae6f0 to 0xeae730:
   0x0000000000eae6f0
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2480>:
mov    0x18(%rsp),%edi
   0x0000000000eae6f4
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2484>:
lea    0x100(%rsp),%rsi
   0x0000000000eae6fc
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2492>:
mov    %r9,0x100(%rsp)
   0x0000000000eae704
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2500>:
mov    %ebx,0x108(%rsp)
   0x0000000000eae70b
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2507>:
callq  0x0
=> 0x0000000000eae710
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2512>:
mov    0x120(%rsp),%rcx
   0x0000000000eae718
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2520>:
mov    0x128(%rsp),%r11
   0x0000000000eae720
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2528>:
mov    0x130(%rsp),%rax
   0x0000000000eae728
<_ZL27simplify_binary_operation_18rtx_code12machine_modeP7rtx_defS2_S2_S2_+2536>:
mov    0x138(%rsp),%rsi
End of assembler dump.

Note the unconditional call 0 that was hit.