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C Copyright (c) 2003-2010 University of Florida
C
C This program is free software; you can redistribute it and/or modify
C it under the terms of the GNU General Public License as published by
C the Free Software Foundation; either version 2 of the License, or
C (at your option) any later version.
C This program is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
C GNU General Public License for more details.
C The GNU General Public License is included in this distribution
C in the file COPYRIGHT.
subroutine init_stack(depth)
c---------------------------------------------------------------------------
c Sets up a stack for the (start, end) operation pairs that define a
c do loop.
c
c "Depth" is the maximum stack depth.
c---------------------------------------------------------------------------
implicit none
include 'machine_types.h'
include 'parallel_info.h'
#ifdef ALTIX
include 'sheap.h'
#endif
integer x(2)
#ifdef ALTIX
pointer (iptr, x)
#else
common x
#endif
integer depth
integer size, ierr
integer*8 ixstack
integer sp, stack_depth
common /dostack/ixstack, sp, stack_depth
stack_depth = depth
sp = 1
#ifdef ALTIX
iptr = ishptr
#endif
call mem_alloc(x, 2*depth, intsize, ixstack, .true., ierr)
if (ierr .ne. 0) then
print *,'Error: Unable to allocate memory for do stack.'
call abort_job()
endif
return
end
integer function push_do(start, end)
c--------------------------------------------------------------------------
c Push a pair of start, end values onto the do stack.
c Stack overflow --> function returns -1, else 0.
c--------------------------------------------------------------------------
implicit none
include 'parallel_info.h'
#ifdef ALTIX
include 'sheap.h'
#endif
integer x(2)
#ifdef ALTIX
pointer (iptr, x)
#else
common x
#endif
integer*8 ixstack
integer sp, stack_depth
common /dostack/ixstack, sp, stack_depth
integer*8 ix
integer start, end
#ifdef ALTIX
iptr = ishptr
#endif
if (sp .gt. stack_depth) then
push_do = -1
else
ix = ixstack + 2*(sp-1)
x(ix) = start
x(ix+1) = end
sp = sp + 1
push_do = 0
endif
c print *,'Task ',me,' PUSH ix ',ix,' start, end ',start,end
c call c_flush_stdout()
return
end
integer function pop_do(start, end)
c---------------------------------------------------------------------------
c Pops a pair of start, end values off the stack, returns 0 if successful,
c or -1 if stack underflow results.
c---------------------------------------------------------------------------
implicit none
include 'parallel_info.h'
#ifdef ALTIX
include 'sheap.h'
#endif
integer x(2)
#ifdef ALTIX
pointer (iptr, x)
#else
common x
#endif
integer*8 ixstack
integer sp, stack_depth
common /dostack/ixstack, sp, stack_depth
integer start, end
integer*8 ix
#ifdef ALTIX
iptr = ishptr
#endif
if (sp .eq. 1) then
pop_do = -1
else
pop_do = 0
sp = sp - 1
ix = ixstack + 2*(sp-1)
start = x(ix)
end = x(ix+1)
endif
c print *,'Task ',me,' POP ix ',ix,' start end ',start,end
return
end
subroutine checkpoint_instruction_stack(unit)
c---------------------------------------------------------------------------
c Saves the instruction stack to a checkpoint file.
c---------------------------------------------------------------------------
implicit none
include 'parallel_info.h'
#ifdef ALTIX
include 'sheap.h'
#endif
integer x(2)
#ifdef ALTIX
pointer (iptr, x)
#else
common x
#endif
integer*8 ixstack
integer sp, stack_depth
common /dostack/ixstack, sp, stack_depth
integer i, n, unit
#ifdef ALTIX
iptr = ishptr
#endif
write (unit) sp
if (sp .gt. 1) then
n = (2*(sp-1))/4
write (unit) (x(ixstack+i-1),i=1,4*n)
endif
return
end
subroutine restore_instruction_stack(unit)
c---------------------------------------------------------------------------
c Reads the instruction stack from the checkpoint file.
c---------------------------------------------------------------------------
implicit none
include 'parallel_info.h'
#ifdef ALTIX
include 'sheap.h'
#endif
integer x(2)
#ifdef ALTIX
pointer (iptr, x)
#else
common x
#endif
integer*8 ixstack
integer sp, stack_depth
common /dostack/ixstack, sp, stack_depth
integer i, n, unit
#ifdef ALTIX
iptr = ishptr
#endif
read (unit) sp
if (sp .gt. 1) then
n = (2*(sp-1)) / 4 ! each entry is startop, endop, iwhere, nwhere
read (unit) (x(ixstack+i-1),i=1,4*n)
endif
return
end
subroutine broadcast_instruction_stack(comm)
c---------------------------------------------------------------------------
c Broadcasts the instruction stack to each process in the communicator.
c---------------------------------------------------------------------------
implicit none
include 'mpif.h'
include 'parallel_info.h'
#ifdef ALTIX
include 'sheap.h'
#endif
integer x(2)
#ifdef ALTIX
pointer (iptr, x)
#else
common x
#endif
integer*8 ixstack
integer sp, stack_depth
common /dostack/ixstack, sp, stack_depth
integer i, comm, ierr
#ifdef ALTIX
iptr = ishptr
#endif
call mpi_bcast(x(ixstack), 2*stack_depth, MPI_INTEGER, 0,
* comm, ierr)
call mpi_bcast(sp, 1, MPI_INTEGER, 0, comm, ierr)
return
end
subroutine restore_do_loops(optable, noptable, index_table,
* nindex_table, segment_table, nsegment_table,
* checkpoint_seg, ckpt_start_op, ckpt_end_op)
c---------------------------------------------------------------------------
c Reinitializes each doloop instruction in the instruction stack during
c a checkpoint/restart operation.
c
c The normal do_loop_init routine is first called, then the current_seg
c entry in the index_table is set to the corresponding entry from the
c checkpoint_seg array.
c---------------------------------------------------------------------------
implicit none
include 'mpif.h'
include 'parallel_info.h'
include 'interpreter.h'
#ifdef ALTIX
include 'sheap.h'
#endif
integer noptable, nindex_table, nsegment_table
integer optable(loptable_entry,noptable)
integer index_table(lindex_table_entry,nindex_table)
integer segment_table(lsegment_table_entry,nsegment_table)
integer checkpoint_seg(nindex_table)
integer ckpt_start_op, ckpt_end_op
integer x(2)
#ifdef ALTIX
pointer (iptr, x)
#else
common x
#endif
integer*8 ixstack
integer sp, stack_depth
common /dostack/ixstack, sp, stack_depth
integer i, n, comm, ierr
integer index, start_op, end_op, iop
logical subrange_flag
#ifdef ALTIX
iptr = ishptr
#endif
n = (2*(sp-1))/4 ! number of stack entries.
do i = 1, n
iop = x(ixstack+4*(i-1))
if (optable(c_opcode,iop) .eq. do_op) then
optable(c_oploop, iop) = 1 ! loop init flag
call get_loop_index(optable(c_ind1,iop), index,
* subrange_flag)
endif
enddo
c------------------------------------------------------------------------
c Carry out the same procedure for the checkpointed start_op and
c end_op. It is possible that this is also a doloop instruction, and
c therefore that loop must also be initialized to execute correctly.
c------------------------------------------------------------------------
iop = ckpt_start_op
if (optable(c_opcode,iop) .eq. do_op) then
optable(c_oploop, iop) = 1 ! loop init flag
call get_loop_index(optable(c_ind1,iop), index,
* subrange_flag)
endif
return
end
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