[Bug target/66410] New: [SH] ICE: in assign_by_spills, at lra-assigns.c:1428 with -mlra

[kkojima at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66410

            Bug ID: 66410
           Summary: [SH] ICE: in assign_by_spills, at lra-assigns.c:1428
                    with -mlra
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kkojima at gcc dot gnu.org
                CC: olegendo at gcc dot gnu.org
  Target Milestone: ---
            Target: sh*-*-*

With -O2 -mlra, trunk sh compiler fails to compile zlib/deflate.c:

zlib/deflate.c: In function 'deflateSetDictionary':
zlib/deflate.c:389:1: error: unable to find a register to spill
zlib/deflate.c:389:1: error: this is the insn:
(insn 803 804 156 15 (set (reg:HI 387)
        (reg:HI 388)) zlib/deflate.c:349 272 {*movhi}
     (expr_list:REG_DEAD (reg:HI 388)
        (nil)))
zlib/deflate.c:389:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1428
0x86e265f _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        trunk/gcc/rtl-error.c:110
0x85e21cc assign_by_spills
        trunk/gcc/lra-assigns.c:1428
...