createPreplace.tcl

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###############################################################################
# Copyright (c) 2013-2024 by Altair Engineering, Inc.
# All rights reserved.
#
# Altair Engineering, Inc. makes this software available as part of the Vision
# tool platform.  As long as you are a licensee of the Vision tool platform
# you may make copies of the software and modify it to be used within the
# Vision tool platform, but you must include all of this notice on any copy.
# Redistribution without written permission to any third party, with or
# without modification, is not permitted.
# Altair Engineering, Inc. does not warrant that this software is error free
# or fit for any purpose.  Altair Engineering, Inc. disclaims any liability for
# all claims, expenses, losses, damages and costs any user may incur as a
# result of using, copying or modifying the software.
# =============================================================================
#   @script
#       Add preplace information to a given binfile created by the LEF/DEF
#       reader.
###############################################################################


##
# Option to use 'physical symbol'.
#
set useLefSymbols 0


# -----------------------------------------------------------------------------
# _createSchemCache - Get @X and @Y values from port and instance attributes
#                     and add preplace information using the database schematic
#                     cache to the given module.
# -----------------------------------------------------------------------------
#
proc _createSchemCache {db module} {
    set preplace ""

    ##
    # Preplace ports.
    #
    $db foreach port $module port {
        ##
        # currently disabled
        #
        break

        set y [$db attr $port getValue "@Y"]
        if {$y == ""} {
            continue
        }
        append preplace "preplace port [$db oid oname $port] -pg 1 -y $y\n"
    }

    ##
    # Loop over all instances to get the lowest X and Y value.
    #
    set xList {}
    set yList {}
    set lowestX 1
    set lowestY 1
    $db foreach inst $module inst {
        set x [$db attr $inst getValue "@X"]
        set y [$db attr $inst getValue "@Y"]
        if {$x == "" || $y == ""} {
            continue
        }
        lappend xList $x
        lappend yList $y
        if {$x < $lowestX} {set lowestX $x}
        if {$y < $lowestY} {set lowestY $y}
    }

    ##
    # Loop again over all instances and create the preplace information
    # for x (level) and y shifted by the lowest X/Y value to make sure to
    # get positive values.
    #
    $db foreach inst $module inst {
        set x [$db attr $inst getValue "@X"]
        set y [$db attr $inst getValue "@Y"]
        if {$x == "" || $y == ""} {
            continue
        }
        set name [$db oid oname $inst]
        set x [expr {($x + -1 * $lowestX + 1) / 100 + 1}]
        set y [expr {$y + -1 * $lowestY + 1}]
        append preplace "preplace inst $name -pg 1 -lvl $x -y $y\n"
    }

    ##
    # Set the database schematic cache with the preplace information.
    #
    $db oid setSchematicCache $module $preplace
}


##
# Get the input file with the list of Liberty files and the corresponding
# binlib.
#
if {$argc != 1} {
    error "Wrong # of args."
}

##
# Open the given binfile.
#
set binfile [lindex $argv 0]
set db [zdb open $binfile]

##
# Disable the automatic schematic generation for the top level. This would be a
# waste of CPU time because we already know the placement.
#
gui settings set "startTopSchematic" 0
gui settings changed

##
# Inform the GUI about the new database. Usually this would render the schematic
# but this feature was disabled above.
#
gui database changed $db

##
# Option to use a physical symbol.
#
if {$useLefSymbols} {
    $db foreach cell cell {
        set layoutSymbol [$db attr $cell getValue "@layoutSymbol"]
        if {$layoutSymbol != {}} {
            $db attr $cell set "@symbol=$layoutSymbol"
        }
    }
}

##
# Now loop over all modules and extract the preplace information.
#
$db foreach module module {
    _createSchemCache $db $module
}

##
# Show the first top module.
#
$db foreach top top {
    gui schem setCurrentModule $top
    break
}