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
