[Bug target/36680] New: ICE in spill_failure, reload1.c:1995

[dfranke at gcc dot gnu dot org]

The code snippet below compiles on FCFLAGS="-O1" and FCFLAGS="-O2", but gives
an ICE on FCFLAGS="-O1 -fschedule-insns". The additional option is supposed to
be part of -O2, according to [1]. 

The problem seems to be target-related as I could not reproduce it on
i686-pc-linux-gnu.

Code is reduced, but probably not minimal yet. 

$> cat ice.f90
MODULE class_dummy_atom_kdtree_types
  TYPE dummy_atom_kdtree_data
    INTEGER :: dummy
  END TYPE

  TYPE :: dummy_atom_kdtree_node
    TYPE(dummy_atom_kdtree_node_private), POINTER :: p
  END TYPE

  TYPE :: dummy_atom_kdtree_node_private
    TYPE(dummy_atom_kdtree_data)                  :: data
  END TYPE

  TYPE :: dummy_atom_kdtree
    TYPE(dummy_atom_kdtree_node) :: root
  END TYPE
END MODULE

FUNCTION dummy_atom_kdtree_insert(this, item)
  USE class_dummy_atom_kdtree_types, ONLY: dummy_atom_kdtree,
dummy_atom_kdtree_node, dummy_atom_kdtree_data

  TYPE(dummy_atom_kdtree), INTENT(inout)   :: this
  TYPE(dummy_atom_kdtree_data), INTENT(in) :: item

  TYPE(dummy_atom_kdtree_data)             :: dummy_atom_kdtree_insert

  TYPE(dummy_atom_kdtree_node) :: parent, current
  TYPE(dummy_atom_kdtree_node) :: node
  INTEGER :: cmp, level, discriminator

  parent        = dummy_atom_kdtree_node(null())
  current       = this%root
  level         = 1
  discriminator = 1

  DO WHILE (ASSOCIATED( current%p ))
    discriminator = MODULO(level-1, 3) + 1
    cmp = dummy_atom_kdtree_data_compare(item, current%p%data, discriminator)
    level   = level + 1
  END DO

  dummy_atom_kdtree_insert = item
END FUNCTION

$> gfortran-svn -O1 -fschedule-insns ice.f90
ice.f90: In function 'dummy_atom_kdtree_insert':
ice.f90:42: error: unable to find a register to spill in class 'AREG'
ice.f90:42: error: this is the insn:
(insn 19 31 20 4 ice.f90:37 (parallel [
            (set (reg:SI 37 r8 [69])
                (truncate:SI (lshiftrt:DI (mult:DI (zero_extend:DI (reg:SI 37
r8 [68]))
                            (zero_extend:DI (reg:SI 42 r13 [78])))
                        (const_int 32 [0x20]))))
            (clobber (scratch:SI))
            (clobber (reg:CC 17 flags))
        ]) 342 {*umulsi3_highpart_insn} (expr_list:REG_DEAD (reg:SI 37 r8 [68])
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (nil))))
ice.f90:42: internal compiler error: in spill_failure, at reload1.c:1995
Please submit a full bug report,

$> gfortran-svn -v
gcc version 4.4.0 20080629 (experimental) (GCC)

The same holds for 4.3.2.

[1] http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#Optimize-Options


-- 
           Summary: ICE in spill_failure, reload1.c:1995
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dfranke at gcc dot gnu dot org
  GCC host triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36680