[Bug rtl-optimization/70374] New: [5/6 Regression] ICE: in assign_by_spills, at lra-assigns.c:1428 (unable to find a register to spill) with -march=core2 -fno-split-wide-types -mavx512f

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70374

            Bug ID: 70374
           Summary: [5/6 Regression] ICE: in assign_by_spills, at
                    lra-assigns.c:1428 (unable to find a register to
                    spill) with -march=core2 -fno-split-wide-types
                    -mavx512f
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
            Target: x86_64-pc-linux-gnu

Compiler output:
$ gcc -O -march=core2 -fschedule-insns -fno-split-wide-types -mavx512f
testcase.c         
testcase.c: In function 'foo':
testcase.c:11:1: error: unable to find a register to spill
 }
 ^
testcase.c:11:1: error: this is the insn:
(insn 22 64 65 2 (parallel [
            (set (reg:TI 138)
                (mult:TI (zero_extend:TI (subreg/j:DI (reg:TI 138) 0))
                    (zero_extend:TI (subreg:DI (reg:TI 105 [ b ]) 0))))
            (clobber (reg:CC 17 flags))
        ]) testcase.c:8 334 {*umulditi3_1}
     (expr_list:REG_DEAD (reg:TI 105 [ b ])
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (nil))))
testcase.c:11:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1417
0xb37008 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.c:108
0xa03077 assign_by_spills
        /repo/gcc-trunk/gcc/lra-assigns.c:1417
0xa040a3 lra_assign()
        /repo/gcc-trunk/gcc/lra-assigns.c:1590
0x9ff504 lra(_IO_FILE*)
        /repo/gcc-trunk/gcc/lra.c:2335
0x9a5c19 do_reload
        /repo/gcc-trunk/gcc/ira.c:5425
0x9a5c19 execute
        /repo/gcc-trunk/gcc/ira.c:5609
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.

$ gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-234405-checking-yes-rtl-df-nographite/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-checking=yes,rtl,df --without-cloog --without-ppl --without-isl
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-234405-checking-yes-rtl-df-nographite
Thread model: posix
gcc version 6.0.0 20160322 (experimental) (GCC) 

Tested revisions:
trunk r234405 - FAIL
trunk r234373 - FAIL
5-branch r234375 - FAIL
4_9-branch r234366 - OK