[Bug rtl-optimization/70023] New: [4.9/5/6 Regression] ICE: in assign_by_spills, at lra-assigns.c:1417 with -fno-sched-critical-path-heuristic -fschedule-insns -m8bit-idiv

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70023

            Bug ID: 70023
           Summary: [4.9/5/6 Regression] ICE: in assign_by_spills, at
                    lra-assigns.c:1417 with
                    -fno-sched-critical-path-heuristic -fschedule-insns
                    -m8bit-idiv
           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

Created attachment 37828
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37828&action=edit
reduced testcase

Compiler output:
$ gcc -O -fno-sched-critical-path-heuristic -fschedule-insns -m8bit-idiv
testcase2.c 
testcase2.c: In function 'foo':
testcase2.c:5:1: note: The ABI for passing parameters with 32-byte alignment
has changed in GCC 4.6
 foo(int u16_0, int u64_0, i128 u128_0, i128 u128_1, v8si v32u32_0, v8si
v32u32_1, v8si v32u64_1)
 ^~~
testcase2.c:5:1: warning: AVX vector argument without AVX enabled changes the
ABI [-Wpsabi]
testcase2.c:12:1: error: unable to find a register to spill
 }
 ^
testcase2.c:12:1: error: this is the insn:
(insn 10 96 94 2 (parallel [
            (set (mem/j/c:SI (plus:DI (reg/f:DI 16 argp)
                        (const_int 32 [0x20])) [1 v32u32_0+24 S4 A64])
                (ashift:SI (mem/j/c:SI (plus:DI (reg/f:DI 16 argp)
                            (const_int 32 [0x20])) [1 v32u32_0+24 S4 A64])
                    (subreg:QI (and:SI (reg:SI 154)
                            (const_int 31 [0x1f])) 0)))
            (clobber (reg:CC 17 flags))
        ]) testcase2.c:7 525 {*ashlsi3_mask}
     (expr_list:REG_DEAD (reg:SI 154)
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (nil))))
testcase2.c:12:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1417
0xb395b8 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.c:108
0xa04e96 assign_by_spills
        /repo/gcc-trunk/gcc/lra-assigns.c:1417
0xa055a3 lra_assign()
        /repo/gcc-trunk/gcc/lra-assigns.c:1590
0xa0096f lra(_IO_FILE*)
        /repo/gcc-trunk/gcc/lra.c:2331
0x9a7189 do_reload
        /repo/gcc-trunk/gcc/ira.c:5396
0x9a7189 execute
        /repo/gcc-trunk/gcc/ira.c:5567
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:

Tested revisions:
trunk r233801 - FAIL
5-branch r233800 - FAIL
4_9-branch r233802 - FAIL
4_8-branch r224828 - FAIL
4_7-branch r211571 - OK