DIRECTORY
Basics, CD, List, IO, Rope, Route, RouteChannel, RouteDiGraph, RoutePrivate, RouteUtil, TerminalIO;

RouteChannelConstraintsImpl: CEDAR PROGRAM
IMPORTS List, IO, Rope, Route, RouteChannel, RouteDiGraph, RouteUtil, TerminalIO
EXPORTS RouteChannel
SHARES Route = {

SegBreakType: TYPE = {dogLeg, exit}; -- should add pinDogLeg sometime
SegBreakSpec: TYPE = REF SegBreakSpecRec;
SegBreakSpecRec: TYPE = RECORD [
pos: Route.Number _ 0,
type: SegBreakType _ dogLeg];
Lmr: TYPE = {left, middle, right};
FullSegBreakSpec: TYPE = RECORD [
seg: RouteChannel.Segment _NIL,
breaks: ARRAY Lmr OF SegBreakSpec _ ALL[NIL]];

BreakResult: TYPE = RECORD [
deltaDensity: Route.Number,
duplicateLength: Route.Number,
numDogLegs: Route.Number];

RangeWithDirList: TYPE = LIST OF RangeWithDir;
RangeWithDir: TYPE = RECORD [
range: RoutePrivate.Range,
dir: RouteChannel.GoingDirection];

ChanPinListSet: TYPE = RECORD [
leftExit, rightExit: RouteChannel.ChanPin _ NIL,
bottomList, topList: RouteChannel.ChanPinList _ NIL];

ChanPinListPair: TYPE = RECORD [
list1, list2: RouteChannel.ChanPinList _ NIL];

TestPins: TYPE = REF TestPinsRec;
TestPinsRec: TYPE = RECORD [
trialPin, leftExitPin, rightExitPin: RouteChannel.ChanPin _ NIL];

GenerateConstraints: PUBLIC PROCEDURE[routingArea: Route.RoutingArea, routerUsed: RoutePrivate.RouterUsed] RETURNS [anythingToDo: BOOLEAN] = {
chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
chanPins: RouteChannel.RoutingChannelPins _ chanData.chanPins;
parms: RoutePrivate.RoutingAreaParms _ NARROW[routingArea.parms];
graphName: Rope.ROPE _ "Vertical Constraints";
segBroken: BOOLEAN _ TRUE;
trialPinPosition: RouteChannel.PinPosition _ NEW[RouteChannel.PinPositionRec _ [pinIndex: 0, pLoc: 0]];
trialPin: RouteChannel.ChanPin _ NEW[RouteChannel.ChanPinRec _ [pinSide: none, qLoc: 0, pWidth: 0, kindOfPin: dogLeg, pinPosition: trialPinPosition]];
leftExitPosition: RouteChannel.PinPosition _ NEW[RouteChannel.PinPositionRec _ [pinIndex: 0, pLoc: chanPins.cEnd1]];
leftExitPin: RouteChannel.ChanPin _ NEW[RouteChannel.ChanPinRec _ [pinSide: none, qLoc: 0, pWidth: 0, kindOfPin: exitPin, pinPosition: leftExitPosition]];
rightExitPosition: RouteChannel.PinPosition _ NEW[RouteChannel.PinPositionRec _ [pinIndex: 0, pLoc: chanPins.cEnd2]];
rightExitPin: RouteChannel.ChanPin _ NEW[RouteChannel.ChanPinRec _ [pinSide: none, qLoc: 0, pWidth: 0, kindOfPin: exitPin, pinPosition: rightExitPosition]];
pins: TestPins _ NEW[TestPinsRec _ [trialPin, leftExitPin, rightExitPin]];
IF chanPins.count = 0 THEN RETURN[FALSE];

WHILE segBroken DO
segBroken _ FALSE;
IF chanData.constraints # NIL THEN DestroyOldConstraints[routingArea]; -- unlink the old graph
chanData.constraints _ RouteDiGraph.CreateGraph[graphName];

FOR index: RouteChannel.MPinsOnCh IN [1 .. chanPins.count] DO

WidestPinProc: RouteChannel.EachPinActionProc = {
IF pin # NIL THEN
widestPinD2 _ MAX[widestPinD2, RouteUtil.GetWidthWithContact[routingArea, pin.pWidth]/2]};

LimitProc: RouteChannel.EachPinActionProc = {
spacing: INT _ MAX[routingArea.rules.branchSpacing, routingArea.rules.trunkSpacing];
IF pin # NIL THEN
{width: Route.Number _ RouteUtil.GetWidthWithContact[routingArea, pin.pWidth]/2;
pinPos: Route.Number _ pin.pinPosition.pLoc;
IF pinPos = pLoc THEN
quit _ TRUE
ELSE IF pinPos < pLoc THEN
quit _ pinPos + width + spacing > pLoc - widestPinD2
ELSE -- pinPos >= pLoc
quit _ pLoc + widestPinD2 + spacing > pinPos - width}};

pinPosition: RouteChannel.PinPosition _ chanPins.sides[index];
pLoc: Route.Number _ pinPosition.pLoc;
widestPinD2: Route.Number _ RouteUtil.GetWidthWithContact[routingArea, routingArea.rules.branchWidth]/2;
minLimit, maxLimit: RouteChannel.MPinsOnCh;

[] _ RouteChannel.EnumPins[routingArea, pinPosition, WidestPinProc];
[minLimit, maxLimit] _ RouteChannel.FindConstraintLimits[routingArea, index, index, LimitProc];
FOR upperIndex: RouteChannel.MPinsOnCh IN [minLimit .. maxLimit] DO
upperPinPosition: RouteChannel.PinPosition _ chanPins.sides[upperIndex];
upperPin: RouteChannel.ChanPin _ upperPinPosition.pins[chanTop];
lowerPin: RouteChannel.ChanPin _ pinPosition.pins[chanBottom];

IF ProcessConstraints[routingArea, upperPin, lowerPin, middle, pins] THEN GOTO GoRound;
FOR innerPins: RouteChannel.ChanPinList _ pinPosition.innerPins, innerPins.rest WHILE innerPins # NIL DO
innerPin: RouteChannel.ChanPin _ innerPins.first;
IF ProcessConstraints[routingArea, upperPin, innerPin, middle, pins] THEN GOTO GoRound;
IF ProcessConstraints[routingArea, innerPin, lowerPin, middle, pins] THEN GOTO GoRound;
ENDLOOP; -- FOR innerPins
ENDLOOP; -- FOR upperIndex

IF routerUsed = switchBox AND (index = 1 OR  index = chanPins.count) THEN {

QPinCompare: List.CompareProc = {
p1: Route.Number _ NARROW[ref1, RouteChannel.ChanPin].qLoc;
p2: Route.Number _ NARROW[ref2, RouteChannel.ChanPin].qLoc;
RETURN[IF p1 < p2 THEN Basics.Comparison.less
ELSE IF p1 = p2 THEN Basics.Comparison.equal
ELSE Basics.Comparison.greater]};

whichEnd: Lmr _ IF index = 1 THEN left ELSE right;
mungedPinList: List.LORA _ ConvertToLORA[pinPosition.innerPins];
sortedPinList: List.LORA _ List.Sort[mungedPinList, QPinCompare];
FOR pList: List.LORA -- RouteChannel.ChanPinList -- _ sortedPinList, pList.rest WHILE pList # NIL DO
lowerPin: RouteChannel.ChanPin _ NARROW[pList.first];
sList: RouteChannel.SegmentList _ RouteChannel.GetSegsOnPin[lowerPin];

IF pList.rest # NIL THEN {
upperPin: RouteChannel.ChanPin _ NARROW[pList.rest.first];
IF ProcessConstraints[routingArea, upperPin, lowerPin, whichEnd, pins] THEN GOTO GoRound};

FOR segs: RouteChannel.SegmentList _ sList, segs.rest WHILE segs # NIL DO
seg: RouteChannel.Segment _ segs.first;
IF seg.trackConstraint # 0 AND seg.secTrackConstraint # 0 AND seg.trackConstraint # seg.secTrackConstraint AND ~seg.failed THEN {
break: FullSegBreakSpec _ BreakOneSeg[routingArea, seg, NIL, whichEnd, pins];
IF BreaksFound[break] > 0 THEN {
DoBreak[routingArea, break]; GOTO GoRound}
ELSE {  -- mark seg as failed --
seg.failed _ TRUE;
TerminalIO.PutRope[Rope.Cat["\nunable to find a place to dogleg, net: ", seg.net.name, " failed"]]}};
IF FALSE THEN {
leftPinPosition: RouteChannel.PinPosition _ chanPins.sides[1];
leftPinList: RouteChannel.ChanPinList _ leftPinPosition.innerPins;
FOR lPList: RouteChannel.ChanPinList _ leftPinList, lPList.rest WHILE lPList # NIL DO
leftPin: RouteChannel.ChanPin _ NARROW[lPList.first];
lSList: RouteChannel.SegmentList _ RouteChannel.GetSegsOnPin[leftPin];
FOR lSegs: RouteChannel.SegmentList _ lSList, lSegs.rest WHILE lSegs # NIL DO
leftSeg: RouteChannel.Segment _ lSegs.first;
leftSegNode: RouteDiGraph.Node _ leftSeg.constraintNode;
rightSegNode: RouteDiGraph.Node _ seg.constraintNode;
leftToRightSegList: RouteChannel.SegmentList _ SegsInCycle[graph, leftSegNode, rightSegNode];
rightToLeftSegList: RouteChannel.SegmentList;
chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
graph: RouteDiGraph.Graph _ chanData.constraints;
IF leftToRightSegList # NIL THEN
{density: RouteChannel.Density _ RouteChannel.ComputeDensity[routingArea];
segBreak: FullSegBreakSpec _ FindBreak[routingArea, leftToRightSegList, density, whichEnd, pins];
IF BreaksFound[segBreak] > 0 THEN DoBreak[routingArea, segBreak]
ELSE {  -- choose a victim --
lSegs.first.failed _ TRUE;
TerminalIO.PutRope[Rope.Cat["\nnet: ", lSegs.first.net.name, " failed, unable to find a place to dogleg"]]};

segBroken _ TRUE; GOTO GoRound};
rightToLeftSegList _ SegsInCycle[graph, rightSegNode, leftSegNode];
IF rightToLeftSegList # NIL THEN
{density: RouteChannel.Density _ RouteChannel.ComputeDensity[routingArea];
segBreak: FullSegBreakSpec _ FindBreak[routingArea, rightToLeftSegList, density, whichEnd, pins];
IF BreaksFound[segBreak] > 0 THEN DoBreak[routingArea, segBreak]
ELSE {  -- choose a victim --
lSegs.first.failed _ TRUE;
TerminalIO.PutRope[Rope.Cat["\nnet: ", lSegs.first.net.name, " failed, unable to find a place to dogleg"]]};

segBroken _ TRUE; GOTO GoRound};
ENDLOOP;
ENDLOOP;
};
ENDLOOP;
ENDLOOP};
REPEAT GoRound => segBroken _ TRUE;
ENDLOOP; -- WHILE index
ENDLOOP; -- WHILE segBroken
RETURN[TRUE]}; -- GenerateConstraints

DestroyOldConstraints: PUBLIC PROC [routingArea: Route.RoutingArea] = {

chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
chanPins: RouteChannel.RoutingChannelPins _ chanData.chanPins;
DestroyGraph: RouteDiGraph.EnumGraphProc = {NULL};

DestroyArc: RouteDiGraph.EnumArcProc = {NULL};

DestroyNode: RouteDiGraph.EnumNodeProc = {
nodeInfo: RouteChannel.SegmentConstraint _ NARROW[node.nodeInfo];
nodeInfo.segment _ NIL};

ClearConstraints: RouteChannel.EachPinActionProc = {
leftSeg: RouteChannel.Segment _ pin.conctSeg[chanLeft];
rightSeg: RouteChannel.Segment _ pin.conctSeg[chanRight];
IF leftSeg # NIL THEN leftSeg.constraintNode _ NIL;
IF rightSeg # NIL THEN rightSeg.constraintNode _ NIL};

FOR index: RouteChannel.MPinsOnCh IN [1 .. chanPins.count] DO
pinPosition: RouteChannel.PinPosition _ chanPins.sides[index];
[] _ RouteChannel.EnumPins[routingArea, pinPosition, ClearConstraints];
ENDLOOP;

RouteDiGraph.DestroyGraph[chanData.constraints, DestroyGraph, DestroyNode, DestroyArc]};

ProcessConstraints: PROCEDURE[routingArea: Route.RoutingArea, upperPin, lowerPin: RouteChannel.ChanPin, whichEnd: Lmr, pins: TestPins] RETURNS [segBroken: BOOLEAN _ FALSE] = {

IF upperPin # NIL AND lowerPin # NIL THEN
IF upperPin.kindOfPin # noPin AND  lowerPin.kindOfPin # noPin THEN
IF (upperPin.kindOfPin # exitPin AND lowerPin.kindOfPin # exitPin) OR (whichEnd # middle AND upperPin.kindOfPin = exitPin AND lowerPin.kindOfPin = exitPin) THEN
IF Constraining[routingArea, upperPin, lowerPin] THEN
FOR lowerSegIndex: RouteChannel.ChanLRSide IN [chanLeft .. chanRight] WHILE ~segBroken DO
FOR upperSegIndex: RouteChannel.ChanLRSide IN [chanLeft .. chanRight] WHILE ~segBroken DO
lowerSeg: RouteChannel.Segment _ lowerPin.conctSeg[lowerSegIndex];
upperSeg: RouteChannel.Segment _ upperPin.conctSeg[upperSegIndex];
IF DoConstraint[routingArea, lowerSeg, upperSeg, whichEnd, pins] THEN segBroken _ TRUE;
ENDLOOP; -- FOR upperSegIndex
ENDLOOP; -- FOR lowerSegIndex
};

Constraining: PROC [routingArea: Route.RoutingArea, pin1, pin2: RouteChannel.ChanPin] RETURNS [constraining: BOOLEAN _ FALSE] = {

spacing: INT _ MAX[routingArea.rules.branchSpacing, routingArea.rules.trunkSpacing];
IF pin1 # NIL AND pin2 # NIL THEN
{p1: Route.Number _ pin1.pinPosition.pLoc;
w1WContact: Route.Number _ RouteUtil.GetWidthWithContact[routingArea, pin1.pWidth]/2;
w1: Route.Number _ pin1.pWidth/2;
p2: Route.Number _ pin2.pinPosition.pLoc;
w2WContact: Route.Number _ RouteUtil.GetWidthWithContact[routingArea, pin2.pWidth]/2;
w2: Route.Number _ pin2.pWidth/2;
IF p1 = p2 THEN
constraining _ TRUE
ELSE IF p1 < p2 THEN
constraining _ (p1 + w1WContact + spacing > p2 - w2)
OR (p1 + w1 + spacing > p2 - w2WContact)
ELSE -- p1 > p2
constraining _ (p2 + w2WContact + spacing > p1 - w1)
OR (p2 + w2 + spacing > p1 - w1WContact)}};

DoConstraint: PROCEDURE[routingArea: Route.RoutingArea, lowerSeg, upperSeg: RouteChannel.Segment, whichEnd: Lmr, pins: TestPins] RETURNS [segBroken: BOOLEAN _ FALSE] = {

IF lowerSeg # NIL AND upperSeg # NIL AND lowerSeg # upperSeg THEN
IF ~lowerSeg.failed AND ~upperSeg.failed AND (lowerSeg.net.netNum # upperSeg.net.netNum OR lowerSeg.net.netPart # upperSeg.net.netPart) THEN {
segList: RouteChannel.SegmentList;
chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
graph: RouteDiGraph.Graph _ chanData.constraints;
nets: RoutePrivate.NetTab _ NARROW[routingArea.nets];
lowerNode: RouteDiGraph.Node _ lowerSeg.constraintNode;
upperNode: RouteDiGraph.Node _ upperSeg.constraintNode;
IF lowerNode = NIL THEN
{constraint: RouteChannel.SegmentConstraint _ NEW[RouteChannel.SegmentConstraintRec _ [lowerSeg.net.name, lowerSeg]];
lowerNode _ RouteDiGraph.AddNewNode[graph, constraint];
lowerSeg.constraintNode _ lowerNode};
IF upperNode = NIL THEN
{constraint: RouteChannel.SegmentConstraint _ NEW[RouteChannel.SegmentConstraintRec _ [upperSeg.net.name, upperSeg]];
upperNode _ RouteDiGraph.AddNewNode[graph, constraint];
upperSeg.constraintNode _ upperNode};

segList _ SegsInCycle[graph, lowerNode, upperNode];
IF segList # NIL THEN
{density: RouteChannel.Density _ RouteChannel.ComputeDensity[routingArea];
segBreak: FullSegBreakSpec _ FindBreak[routingArea, segList, density, whichEnd, pins];
IF BreaksFound[segBreak] > 0 THEN DoBreak[routingArea, segBreak]
ELSE {  -- choose a victim --
segList.first.failed _ TRUE;
TerminalIO.PutRope[Rope.Cat["\nnet: ", segList.first.net.name, " failed, unable to find a place to dogleg"]]};

segBroken _ TRUE}
ELSE { -- add a segment constraint

IF ~RouteDiGraph.PathExists[graph, upperNode, lowerNode] THEN
[] _ RouteDiGraph.AddNewArc[graph, NIL, upperNode, lowerNode]}}};

SegsInCycle: PROCEDURE[graph: RouteDiGraph.Graph, lowerNode, upperNode: RouteDiGraph.Node]
RETURNS [segList: RouteChannel.SegmentList _ NIL] = {

ArcProc: RouteDiGraph.EnumArcsFromNodeProc = {
IF arc.superiorNode = lowerNode THEN
{nodeInfo: RouteChannel.SegmentConstraint _ NARROW[lowerNode.nodeInfo];
segList _ CONS[nodeInfo.segment, segList];
quit _ TRUE}
ELSE quit _ RouteDiGraph.EnumArcsFromNode[graph, arc.superiorNode, out, ArcProc];
IF quit THEN
{nodeInfo: RouteChannel.SegmentConstraint _ NARROW[node.nodeInfo];
segList _ CONS[nodeInfo.segment, segList]}};

[] _ RouteDiGraph.EnumArcsFromNode[graph, upperNode, out, ArcProc]};

FindBreak: PROC [routingArea: Route.RoutingArea, segList: RouteChannel.SegmentList, density: RouteChannel.Density, whichEnd: Lmr, pins: TestPins] RETURNS [bestBreak: FullSegBreakSpec _ [NIL, [NIL, NIL, NIL]]] = {

bestResult: BreakResult _ [LAST[INT], LAST[INT], LAST[INT]];

FOR segs: RouteChannel.SegmentList _ segList, segs.rest WHILE segs # NIL DO
seg: RouteChannel.Segment _ segs.first;
break: FullSegBreakSpec _ BreakOneSeg[routingArea, seg, density, whichEnd, pins];
result: BreakResult _ EvalBreak[routingArea, break, density];
IF CompareResult[result, bestResult] = less THEN
{bestResult _ result; bestBreak _ break};
ENDLOOP;

IF bestBreak.seg = NIL THEN RETURN[[NIL, [NIL, NIL, NIL]]]};

BreakOneSeg: PROC [routingArea: Route.RoutingArea, seg: RouteChannel.Segment, density: RouteChannel.Density, whichEnd: Lmr, pins: TestPins] RETURNS [break: FullSegBreakSpec] = {

parms: RoutePrivate.RoutingAreaParms _ NARROW[routingArea.parms];
exitsSeparate: BOOLEAN _ IF parms.routerUsed = channel THEN FALSE ELSE TRUE;
pinLists: ChanPinListSet _ GetPins[exitsSeparate, seg];
rangeList: RangeWithDirList _ SegRanges[routingArea, pinLists];
break _ [seg, [NIL, NIL, NIL]];
SELECT parms.routerUsed FROM
channel => {
FOR ranges: RangeWithDirList _ rangeList, ranges.rest WHILE ranges # NIL DO
break.breaks[middle] _ BreakWithInRange[routingArea, seg, ranges.first, pins];
IF break.breaks[middle] # NIL THEN EXIT;
ENDLOOP;

IF break.breaks[middle] = NIL THEN
break.breaks[middle] _ BreakAtExit[routingArea, seg, density]};

switchBox => {
DoMiddle: PROC [] ~ {
IF top AND bottom AND BreaksFound[break] = 0 THEN {
FOR ranges: RangeWithDirList _ rangeList, ranges.rest WHILE ranges # NIL DO
break.breaks[middle] _ BreakWithInRange[routingArea, seg, ranges.first, pins];
IF break.breaks[middle] # NIL THEN EXIT;
ENDLOOP}};

DoLeft: PROC [] ~ {
IF left AND (top OR right OR bottom) AND BreaksFound[break] = 0 THEN {
leftRange: RangeWithDir _ [[cEnd1, cEnd2], leftToRight];
break.breaks[left] _ BreakWithInRange[routingArea, seg, leftRange, pins]}};

DoRight: PROC [] ~ {
IF right AND (top OR left OR bottom) AND BreaksFound[break] = 0 THEN {
rightRange: RangeWithDir _ [[cEnd1, cEnd2], rightToLeft];
break.breaks[right] _ BreakWithInRange[routingArea, seg, rightRange, pins]}};

chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
cEnd1: Route.Number _ chanData.chanPins.cEnd1;
cEnd2: Route.Number _ chanData.chanPins.cEnd2;
left, top, right, bottom: BOOLEAN;
[left, top, right, bottom] _ RouteChannel.PinsOnSide[routingArea, seg];

SELECT TRUE FROM
whichEnd = left => {DoLeft; DoRight; DoMiddle};
whichEnd = right => {DoRight; DoLeft; DoMiddle};
seg.trackConstraint # 0 => {DoRight; DoLeft; DoMiddle};
ENDCASE => {DoMiddle; DoRight; DoLeft};
};

ENDCASE => Route.Error[programmingError, "Invalid router being used."];
};

BreakWithInRange: PROC [routingArea: Route.RoutingArea, seg: RouteChannel.Segment, range: RangeWithDir, pins: TestPins] RETURNS [break: SegBreakSpec _ NIL] = {

WidestPinProc: RouteChannel.EachPinActionProc = {
IF pin # NIL THEN
widestPinD2 _ MAX[widestPinD2, RouteUtil.GetWidthWithContact[routingArea, pin.pWidth]/2]};

NextPosToRight: PROC [pinIndex: RouteChannel.ZMPinsOnCh] RETURNS[pos: Route.Number] ~ {
spacing: INT _ MAX[routingArea.rules.branchSpacing, routingArea.rules.trunkSpacing];
IF pinIndex = 0 THEN
pos _ chanPins.cEnd1 + spacing + seg.net.branchWidth
ELSE IF pinIndex >= chanPins.count+1 THEN
pos _ LAST[INT]
ELSE {
pinPosition: RouteChannel.PinPosition _ chanPins.sides[pinIndex];
widestPinD2 _ minPinD2;
[] _ RouteChannel.EnumPins[routingArea, pinPosition, WidestPinProc];
pos _ pinPosition.pLoc + widestPinD2 + spacing + RouteUtil.GetWidthWithContact[routingArea, seg.net.branchWidth]/2}};

NextPosToLeft: PROC [pinIndex: RouteChannel.ZMPinsOnCh] RETURNS[pos: Route.Number] ~ {
spacing: INT _ MAX[routingArea.rules.branchSpacing, routingArea.rules.trunkSpacing];
IF pinIndex <= 0 THEN
pos _ FIRST[INT]
ELSE IF pinIndex = chanPins.count THEN
pos _ chanPins.cEnd2 - spacing - seg.net.branchWidth
ELSE {
pinPosition: RouteChannel.PinPosition _ chanPins.sides[pinIndex];
widestPinD2 _ minPinD2;
[] _ RouteChannel.EnumPins[routingArea, pinPosition, WidestPinProc];
pos _ pinPosition.pLoc - widestPinD2 - spacing - RouteUtil.GetWidthWithContact[routingArea, seg.net.branchWidth]/2}};

-- minPinD2: Route.Number _ RouteUtil.GetWidthWithContact[routingArea, routingArea.rules.branchWidth]/2;
minPinD2: Route.Number _ routingArea.rules.branchWidth/2;
chanPins: RouteChannel.RoutingChannelPins _ NARROW[routingArea.privateData, RouteChannel.ChannelData].chanPins;
widestPinD2: Route.Number;

SELECT range.dir FROM
leftToRight => {
nextLower: RouteChannel.ZMPinsOnCh _ ClosestPins[routingArea, range.range.l].nextLower;
FOR pos: Route.Number _ range.range.l, NextPosToRight[nextLower] WHILE pos <= range.range.r DO
IF ~DogLegNotAllowed[routingArea, seg, pos, pins] THEN {
break _ NEW[SegBreakSpecRec _  [pos, dogLeg]];
EXIT};
nextLower _ MIN[chanPins.count+1, nextLower + 1];
ENDLOOP};
rightToLeft => {
nextHigher: RouteChannel.ZMPinsOnCh _ ClosestPins[routingArea, range.range.r].nextHigher;
FOR pos: Route.Number _ range.range.r, NextPosToLeft[nextHigher] WHILE pos >= range.range.l DO
IF ~DogLegNotAllowed[routingArea, seg, pos, pins] THEN { 
break _ NEW[SegBreakSpecRec _  [pos, dogLeg]];
EXIT};
nextHigher _ MAX[0, nextHigher - 1];
ENDLOOP};
ENDCASE};

DogLegNotAllowed: PROC [routingArea: Route.RoutingArea, seg: RouteChannel.Segment, pos: Route.Number, pins: TestPins] RETURNS [notAllowed: BOOLEAN _ FALSE] = {

FindConnectedNet: PROC [pin: RouteChannel.ChanPin] RETURNS [net: RoutePrivate.Net _ NIL] =
{IF pin # NIL THEN
{s1: RouteChannel.Segment _ pin.conctSeg[chanLeft];
s2: RouteChannel.Segment _ pin.conctSeg[chanRight];
IF s1 # NIL THEN net _ s1.net
ELSE IF s2 # NIL THEN net _ s2.net
ELSE Route.Error[programmingError, "Pin not connected to a segment."]}};

CheckInner: RouteChannel.EachPinActionProc = {
IF pin # NIL THEN
IF pin.kindOfPin = exitPin OR pin.kindOfPin = dogLeg THEN
IF Constraining[routingArea, pin, pins.trialPin] THEN quit _ TRUE};

OuterConstraints: RouteChannel.EachPinActionProc = {
IF pin # NIL THEN
IF pin.kindOfPin = chanConnect OR pin.kindOfPin = compPin THEN
IF Constraining[routingArea, pin, pins.trialPin] THEN quit _ TRUE};

chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
netTab: RoutePrivate.NetTab _ NARROW[routingArea.nets];
chanPins: RouteChannel.RoutingChannelPins _ chanData.chanPins;
minLimit, maxLimit, leftIndex, rightIndex: RouteChannel.ZMPinsOnCh;
width: Route.Number _ MAX[seg.net.trunkWidth, seg.net.branchWidth];
pins.trialPin.pinPosition.pLoc _ pos;
pins.trialPin.pWidth _ width;
pins.leftExitPin.pWidth _ width;
pins.rightExitPin.pWidth _ width;
[leftIndex, rightIndex] _ ClosestPins[routingArea, pos];

IF Constraining[routingArea, pins.trialPin, pins.leftExitPin] THEN notAllowed _ TRUE;
IF Constraining[routingArea, pins.trialPin, pins.rightExitPin] THEN notAllowed _ TRUE;

[minLimit, maxLimit] _ RouteChannel.FindConstraintLimits[routingArea, leftIndex, rightIndex, CheckInner];
FOR index: RouteChannel.MPinsOnCh IN [minLimit .. maxLimit] WHILE ~notAllowed DO
pinPosition: RouteChannel.PinPosition _ chanPins.sides[index];
notAllowed _ RouteChannel.EnumPins[routingArea, pinPosition, CheckInner];
ENDLOOP;
[minLimit, maxLimit] _ RouteChannel.FindConstraintLimits[routingArea, leftIndex, rightIndex, OuterConstraints];
FOR index: RouteChannel.MPinsOnCh IN [minLimit .. maxLimit] WHILE ~notAllowed DO
pinPosition: RouteChannel.PinPosition _ chanPins.sides[index];
bottomPin: RouteChannel.ChanPin _ pinPosition.pins[chanBottom];
topPin: RouteChannel.ChanPin _ pinPosition.pins[chanTop];
bottomNet: RoutePrivate.Net _ FindConnectedNet[bottomPin];
topNet: RoutePrivate.Net _ FindConnectedNet[topPin];
constrainTop: BOOLEAN _ Constraining[routingArea, topPin, pins.trialPin];
constrainBottom: BOOLEAN _ Constraining[routingArea, bottomPin, pins.trialPin];

FOR i: RouteChannel.MPinsOnCh IN [minLimit .. maxLimit] WHILE ~notAllowed DO
pP: RouteChannel.PinPosition _ chanPins.sides[i];
bP: RouteChannel.ChanPin _ pP.pins[chanBottom];
tP: RouteChannel.ChanPin _ pP.pins[chanTop];
bN: RoutePrivate.Net _ FindConnectedNet[bP];
tN: RoutePrivate.Net _ FindConnectedNet[tP];
IF bottomNet = tN AND Constraining[routingArea, topPin, bP] AND constrainTop AND constrainBottom THEN notAllowed _ TRUE;
IF topNet = bN AND Constraining[routingArea, bottomPin, tP] AND constrainTop AND constrainBottom THEN notAllowed _ TRUE;
ENDLOOP;

IF constrainTop OR constrainBottom THEN notAllowed _ TRUE;
ENDLOOP};

BreakAtExit: PROC [routingArea: Route.RoutingArea, seg: RouteChannel.Segment, density: RouteChannel.Density] RETURNS [break: SegBreakSpec] = {

chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
chanPins: RouteChannel.RoutingChannelPins _ chanData.chanPins;
leftBreak: SegBreakSpec _ NEW[SegBreakSpecRec _ [chanPins.cEnd1, exit]];
leftFullBreak: FullSegBreakSpec _ [seg, [leftBreak, NIL, NIL]];
rightBreak: SegBreakSpec _ NEW[SegBreakSpecRec _ [chanPins.cEnd2, exit]];
rightFullBreak: FullSegBreakSpec _ [seg, [NIL, NIL, rightBreak]];
leftResult: BreakResult _ EvalBreak[routingArea, leftFullBreak, density];
rightResult: BreakResult _ EvalBreak[routingArea, rightFullBreak, density];
IF CompareResult[leftResult, rightResult] = less THEN RETURN [leftBreak]
ELSE RETURN [rightBreak]};

EvalBreak: PROC [routingArea: Route.RoutingArea, break: FullSegBreakSpec, density: RouteChannel.Density] RETURNS [result: BreakResult] = {

maxDensity: Route.Number;
lowerRange, upperRange, overlap: RoutePrivate.Range;
parms: RoutePrivate.RoutingAreaParms _ NARROW[routingArea.parms];
exitsSeparate: BOOLEAN _ IF parms.routerUsed = channel THEN FALSE ELSE TRUE;
pinLists: ChanPinListSet _ GetPins[exitsSeparate, break.seg];
IF BreaksFound[break] = 0 THEN RETURN[[LAST[INT], LAST[INT], LAST[INT]]];

IF break.breaks[middle] # NIL THEN { 
lowerRange _ RouteChannel.Span[[break.breaks[middle].pos, break.breaks[middle].pos], RouteChannel.GetRange[pinLists.bottomList]];
upperRange _ RouteChannel.Span[[break.breaks[middle].pos, break.breaks[middle].pos], RouteChannel.GetRange[pinLists.topList]];
overlap _ RouteChannel.Overlap[lowerRange, upperRange];
IF overlap.l > overlap.r THEN Route.Error[programmingError, "overlap should not be NIL."]}
ELSE overlap _ [0,0];

maxDensity _ AddSeg[routingArea, density, overlap, break.seg.qWidth];
result.deltaDensity _ maxDensity - density.maxDensity;
result.duplicateLength _ overlap.r - overlap.l;
result.numDogLegs _ 0;
FOR lmr: Lmr IN Lmr DO
IF break.breaks[lmr] # NIL THEN result.numDogLegs _ result.numDogLegs + 1;
ENDLOOP};

DoBreak: PROC [routingArea: Route.RoutingArea, fullSegBreak: FullSegBreakSpec] = {
UnlinkSegFromPins: RouteChannel.EachPinActionProc ~ {
IF pin.conctSeg[chanLeft] = oldSeg THEN pin.conctSeg[chanLeft] _ NIL;
IF pin.conctSeg[chanRight] = oldSeg THEN pin.conctSeg[chanRight] _ NIL;
IF pin.altConctSeg[chanLeft] = oldSeg THEN pin.altConctSeg[chanLeft] _ NIL;
IF pin.altConctSeg[chanRight] = oldSeg THEN pin.altConctSeg[chanRight] _ NIL;
};

chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
chanPins: RouteChannel.RoutingChannelPins _ chanData.chanPins;
parms: RoutePrivate.RoutingAreaParms _ NARROW[routingArea.parms];
oldSeg: RouteChannel.Segment _ fullSegBreak.seg;
branchWidth: Route.Number _ oldSeg.net.branchWidth;
trunkWidth: Route.Number _ oldSeg.net.trunkWidth;
IF BreaksFound[fullSegBreak]  # 1 THEN
Route.Error[programmingError, "Not suppose to happen"];
[] _ RouteChannel.EnumPinsOnSeg[routingArea, oldSeg, UnlinkSegFromPins];

FOR lmr: Lmr IN Lmr DO
segBreak: SegBreakSpec _ fullSegBreak.breaks[lmr];
IF segBreak # NIL THEN {
pinIndex: RouteChannel.ZMPinsOnCh _ RouteChannel.FindPinPos[routingArea, segBreak.pos];
pinPosition: RouteChannel.PinPosition _ chanPins.sides[pinIndex];
upperPin, lowerPin: RouteChannel.ChanPin _ NIL;
pinListPair: ChanPinListPair;
seg1: RouteChannel.Segment _ NEW[RouteChannel.SegmentRec _ [net: oldSeg.net, qWidth: trunkWidth, exitBreak: oldSeg.exitBreak]];
seg2: RouteChannel.Segment _ NEW[RouteChannel.SegmentRec _ [net: oldSeg.net, qWidth: trunkWidth, exitBreak: oldSeg.exitBreak]];

SELECT segBreak.type FROM
dogLeg => {
exitsSeparate: BOOLEAN _ IF parms.routerUsed = channel THEN FALSE ELSE TRUE;
pinLists: ChanPinListSet _ GetPins[exitsSeparate, oldSeg];
parms.widestPin _ MAX[branchWidth, parms.widestPin];
upperPin _ lowerPin _ NEW[RouteChannel.ChanPinRec _ [pinSide: none, qLoc: 0, pWidth: branchWidth, kindOfPin: dogLeg, pinPosition: pinPosition]];
pinPosition.innerPins _ CONS[upperPin, pinPosition.innerPins];
pinListPair _ DividePins[lmr, pinLists, lowerPin, upperPin]};

exit => {
pinSide: RouteChannel.ChanLRSide _
IF segBreak.pos <= chanPins.cEnd1 THEN chanLeft
ELSE IF segBreak.pos >= chanPins.cEnd2 THEN chanRight
ELSE Route.Error[programmingError, "Invalid data. Call maintainer."];
pinLists: ChanPinListSet _ GetPins[TRUE, oldSeg];
seg1.exitBreak _ TRUE;
seg2.exitBreak _ TRUE;
upperPin _ NEW[RouteChannel.ChanPinRec _ [pinSide: pinSide, qLoc: 0, pWidth: 0, kindOfPin: exitPin, pinPosition: pinPosition]];
pinPosition.innerPins _ CONS[upperPin, pinPosition.innerPins];
lowerPin _ IF pinSide = chanRight THEN pinLists.rightExit ELSE pinLists.leftExit;
IF lowerPin = NIL THEN {
lowerPin _ NEW[RouteChannel.ChanPinRec _ [pinSide: pinSide, qLoc: 0, pWidth: 0, kindOfPin: exitPin, pinPosition: pinPosition]];
pinPosition.innerPins _ CONS[lowerPin, pinPosition.innerPins]}
ELSE {
};
pinListPair _ DividePins[lmr, pinLists, lowerPin, upperPin];
};
ENDCASE;

LinkSegsToPins[seg1, pinListPair.list1, lowerPin];
LinkSegsToPins[seg2, pinListPair.list2, upperPin];
SetTrackConstraints[routingArea, seg1, oldSeg.trackConstraint];
SetTrackConstraints[routingArea, seg2, oldSeg.trackConstraint];

TerminalIO.PutRope[Rope.Cat["\ntrunk segment for net: ", fullSegBreak.seg.net.name, ]];
TerminalIO.PutF1[" divided at: %g", IO.int[chanPins.sides[pinIndex].pLoc/routingArea.rules.CDLambda]];
};
ENDLOOP;
};

DividePins: PROC [which: Lmr, pinLists: ChanPinListSet, pin1, pin2: RouteChannel.ChanPin] RETURNS [pinListPair: ChanPinListPair _ [NIL, NIL]] = {
SELECT which FROM
left => {
IF pinLists.leftExit = NIL THEN Route.Error[programmingError, "exit dogleg with no exit"];
pinListPair.list1 _ LIST[pin1, pinLists.leftExit];
pinListPair.list2 _ RouteChannel.Combine[pinLists.bottomList, pinLists.topList, LIST[pinLists.rightExit, pin2]]};

middle => {
pinListPair.list1 _ RouteChannel.Combine[LIST[pin1], pinLists.bottomList, NIL];
pinListPair.list2 _ RouteChannel.Combine[LIST[pin2], pinLists.topList, NIL];
pinListPair _ AddToClosestList[pinListPair, pinLists.leftExit];
pinListPair _ AddToClosestList[pinListPair, pinLists.rightExit]};

right => {
IF pinLists.rightExit = NIL THEN Route.Error[programmingError, "exit dogleg with no exit"];
pinListPair.list1 _ LIST[pin1, pinLists.rightExit];
pinListPair.list2 _ RouteChannel.Combine[pinLists.bottomList, pinLists.topList, LIST[pinLists.leftExit, pin2]]};
ENDCASE;
};

SetTrackConstraints: PROC [routingArea: Route.RoutingArea, seg: RouteChannel.Segment, trackConstraint: Route.Number] = {

EachPin: RouteChannel.EachPinActionProc = {
IF pin # NIL THEN {
IF pin.trackConstraint # 0 THEN
seg.trackConstraint _ pin.trackConstraint}};

[] _ RouteChannel.EnumPinsOnSeg[routingArea, seg, EachPin] };

AddToClosestList: PROC [pinListPair: ChanPinListPair, pin: RouteChannel.ChanPin] RETURNS [result: ChanPinListPair] ~ {

l1Range: RoutePrivate.Range _ RouteChannel.GetRange[pinListPair.list1];
l2Range: RoutePrivate.Range _ RouteChannel.GetRange[pinListPair.list2];
IF pin # NIL THEN {
pLoc: Route.Number _ pin.pinPosition.pLoc;
IF l1Range.l <= pLoc AND pLoc <= l1Range.r THEN RETURN[[CONS[pin, pinListPair.list1], pinListPair.list2]]
ELSE IF l2Range.l <= pLoc AND pLoc <= l2Range.r THEN RETURN[[pinListPair.list1, CONS[pin, pinListPair.list2]]]
ELSE {
distToL1: Route.Number _ MIN[ABS[pLoc - l1Range.l], ABS[pLoc - l1Range.r]];
distToL2: Route.Number _ MIN[ABS[pLoc - l2Range.l], ABS[pLoc - l2Range.r]];
IF distToL1 < distToL2 THEN RETURN[[CONS[pin, pinListPair.list1], pinListPair.list2]]
ELSE RETURN[[pinListPair.list1, CONS[pin, pinListPair.list2]]]}}
ELSE RETURN[pinListPair]};

LinkSegsToPins: PROC [seg: RouteChannel.Segment, pinList: RouteChannel.ChanPinList, newPin: RouteChannel.ChanPin] = {

PinCompare: List.CompareProc = {
p1: Route.Number _ NARROW[ref1, RouteChannel.ChanPin].pinPosition.pLoc;
p2: Route.Number _ NARROW[ref2, RouteChannel.ChanPin].pinPosition.pLoc;
RETURN[IF p1 < p2 THEN Basics.Comparison.less
ELSE IF p1 = p2 THEN Basics.Comparison.equal
ELSE Basics.Comparison.greater]};

mungedPinList: List.LORA _ ConvertToLORA[pinList];
sortedPinList: List.LORA _ List.Sort[mungedPinList, PinCompare];
rightPin: RouteChannel.ChanPin _ NARROW[List.NthElement[sortedPinList, -1]];
leftPin: RouteChannel.ChanPin _ NARROW[List.NthElement[sortedPinList, 1]];

FOR pList: List.LORA -- RouteChannel.ChanPinList -- _ sortedPinList, pList.rest WHILE pList # NIL DO
chanPin: RouteChannel.ChanPin _ NARROW[pList.first];
IF chanPin = leftPin THEN {
IF chanPin # newPin THEN {chanPin.conctSeg[chanRight] _ seg}
ELSE
{IF chanPin.conctSeg[chanRight] = NIL THEN chanPin.conctSeg[chanRight] _ seg
ELSE chanPin.altConctSeg[chanRight] _ seg};
seg.exteriorPins[chanLeft] _ chanPin}

ELSE IF chanPin = rightPin THEN {IF chanPin # newPin THEN
{chanPin.conctSeg[chanLeft] _ seg; -- chanPin.conctSeg[chanRight] _ NIL -- }
ELSE
{IF chanPin.conctSeg[chanLeft] = NIL THEN chanPin.conctSeg[chanLeft] _ seg
ELSE chanPin.altConctSeg[chanLeft] _ seg};
seg.exteriorPins[chanRight] _ chanPin}

ELSE {seg.interiorPins _ CONS[chanPin, seg.interiorPins];
SELECT chanPin.kindOfPin FROM
chanConnect, compPin => {
chanPin.conctSeg[chanRight] _ seg; chanPin.conctSeg[chanLeft] _ seg};
dogLeg => {
IF chanPin.conctSeg[chanRight] = NIL AND chanPin.conctSeg[chanLeft] = NIL THEN
{chanPin.conctSeg[chanRight] _ seg; chanPin.conctSeg[chanLeft] _ seg}
ELSE
{chanPin.altConctSeg[chanLeft] _ seg; chanPin.altConctSeg[chanRight] _ seg}};
exitPin => Route.Error[programmingError, "Exit pin not on end of segment"];
ENDCASE};
ENDLOOP};

AddSeg: PROC [routingArea: Route.RoutingArea, density: RouteChannel.Density, r: RoutePrivate.Range, width: Route.Number] RETURNS [maxDensity: Route.Number _ 0] = {

chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
chanPins: RouteChannel.RoutingChannelPins _ chanData.chanPins;

IF density # NIL THEN
FOR index: RouteChannel.MPinsOnCh IN [1 .. chanPins.count] DO
pos: Route.Number _ chanPins.sides[index].pLoc;
thisDensity: Route.Number _ IF r.l <= pos AND pos <= r.r THEN density.values[index] + width
ELSE density.values[index];
maxDensity _ MAX[maxDensity, thisDensity];
ENDLOOP};

CompareResult: PROC [r1, r2: BreakResult] RETURNS [result: Basics.Comparison] = {

result _ RouteUtil.SimpleCompare[r1.numDogLegs, r2.numDogLegs];
IF result # equal THEN RETURN;

result _ RouteUtil.SimpleCompare[r1.deltaDensity, r2.deltaDensity];
IF result # equal THEN RETURN;

result _ RouteUtil.SimpleCompare[r1.duplicateLength, r2.duplicateLength];
RETURN};


ClosestPins: PROC [routingArea: Route.RoutingArea, target: Route.Number] RETURNS [nextLower, nextHigher: RouteChannel.ZMPinsOnCh _ 0] = {

chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
chanPins: RouteChannel.RoutingChannelPins _ chanData.chanPins;
trial: RouteChannel.ZMPinsOnCh;
nextHigher _ chanPins.count;
nextLower _ 1;

WHILE ABS[nextHigher - nextLower] > 1 DO
trial _(nextHigher + nextLower)/2;
IF target < chanPins.sides[trial].pLoc THEN nextHigher _ trial
ELSE IF target > chanPins.sides[trial].pLoc THEN nextLower _ trial
ELSE nextLower _ nextHigher _ trial;
ENDLOOP};

GetPins: PROC [exitsSeparate: BOOLEAN, seg: RouteChannel.Segment] RETURNS [pinLists: ChanPinListSet _ [NIL, NIL, NIL, NIL]] = {

IncludePin: PROC [pin: RouteChannel.ChanPin] = {
IF pin.pinSide = chanBottom  THEN  pinLists.bottomList _ CONS[pin, pinLists.bottomList]
ELSE IF pin.pinSide = chanTop THEN pinLists.topList _ CONS[pin, pinLists.topList]
ELSE IF pin.kindOfPin = dogLeg THEN dogLegList _ CONS[pin, dogLegList]};

IncludeExit: PROC [pin: RouteChannel.ChanPin, chanSide: RouteChannel.ChanSide] = {
IF pin.kindOfPin = exitPin THEN
{SELECT exitsSeparate FROM
FALSE => {
result: ChanPinListPair _ AddToClosestList[[pinLists.bottomList, pinLists.topList], pin];
pinLists.bottomList _ result.list1;
pinLists.topList _ result.list2};
TRUE => {
IF pin.pinPosition.pLoc = leftPin.pinPosition.pLoc THEN pinLists.leftExit _ pin
ELSE pinLists.rightExit _ pin};
ENDCASE => Route.Error[programmingError, "Invalid Router."]};
};

dogLegList: RouteChannel.ChanPinList _ NIL;
leftPin: RouteChannel.ChanPin _ seg.exteriorPins[chanLeft];
rightPin: RouteChannel.ChanPin _ seg.exteriorPins[chanRight];
IncludePin[leftPin];
IncludePin[rightPin];
FOR list: RouteChannel.ChanPinList _ seg.interiorPins, list.rest WHILE list # NIL DO
IncludePin[list.first];
ENDLOOP;

IncludeExit[leftPin, chanLeft];
IncludeExit[rightPin, chanRight];

FOR list: RouteChannel.ChanPinList _ dogLegList, list.rest WHILE list # NIL DO
result: ChanPinListPair _ AddToClosestList[[pinLists.bottomList, pinLists.topList], list.first];
pinLists.bottomList _ result.list1;
pinLists.topList _ result.list2;
ENDLOOP;
};

SegRanges: PROC [routingArea: Route.RoutingArea, pinLists: ChanPinListSet] RETURNS [rangeList: RangeWithDirList] = {

chanData: RouteChannel.ChannelData _ NARROW[routingArea.privateData];
chanPins: RouteChannel.RoutingChannelPins _ chanData.chanPins;
lr: RoutePrivate.Range _ RouteChannel.GetRange[pinLists.bottomList];
ur: RoutePrivate.Range _ RouteChannel.GetRange[pinLists.topList];
ce1: Route.Number _ chanPins.cEnd1;
ce2: Route.Number _ chanPins.cEnd2;
min: Route.Number _ MIN[lr.l, ur.l];
max: Route.Number _ MAX[lr.r, ur.r];
left: RangeWithDir _ IF ce1 < min THEN [[ce1, min], rightToLeft] ELSE [[ce1, ce1], rightToLeft]; 
right: RangeWithDir _ IF ce2 > max THEN [[max, ce2], leftToRight] ELSE [[ce2, ce2], leftToRight];

SELECT TRUE FROM
lr.r < lr.l OR ur.r < ur.l =>
rangeList _ LIST[RangeWithDir[[ce1, ce2], leftToRight]];

lr.r < ur.l =>
{gap: RangeWithDir _ [[lr.r, ur.l], leftToRight];
rangeList _ LIST[gap, [lr, rightToLeft], [ur, leftToRight], left, right]};

(lr.l <= ur.l AND ur.l <= lr.r) AND (ur.l <= lr.r AND lr.r <= ur.r) =>
{dual: RangeWithDir _ [[ur.l, lr.r], leftToRight];
ls: RangeWithDir _ [[lr.l, dual.range.l], rightToLeft];
rs: RangeWithDir _ [[dual.range.r, ur.r], leftToRight];
rangeList _ LIST[dual, ls, rs, left, right]};

(lr.l <= ur.l AND ur.l < lr.r) AND (lr.l <= ur.r AND ur.r <= lr.r) =>
{ls: RangeWithDir _ [[lr.l, ur.l], rightToLeft];
rs: RangeWithDir _ [[ur.r, lr.r], leftToRight];
rangeList _ LIST[[ur, leftToRight], ls, rs, left, right]};

(ur.l <= lr.l AND lr.l <= ur.r) AND (ur.l <= lr.r AND lr.r <= ur.r) =>
{ls: RangeWithDir _ [[ur.l, lr.l], rightToLeft];
rs: RangeWithDir _ [[lr.r, ur.r], leftToRight];
rangeList _ LIST[[lr, leftToRight], ls, rs, left, right]};

(ur.l <= lr.l AND lr.l <= ur.r) AND (lr.l <= ur.r AND ur.r <= lr.r) =>
{dual: RangeWithDir _ [[lr.l, ur.r], leftToRight];
ls: RangeWithDir _ [[ur.l, dual.range.l], rightToLeft];
rs: RangeWithDir _ [[dual.range.r, lr.r], leftToRight];
rangeList _ LIST[dual, ls, rs, left, right]};

ur.r < lr.l =>
{gap: RangeWithDir _ [[ur.r, lr.l], leftToRight];
rangeList _ LIST[gap, [lr, leftToRight], [ur, rightToLeft], left, right]};

ENDCASE => Route.Error[programmingError, "Not suppose to happen."]};

BreaksFound: PROCEDURE [break: FullSegBreakSpec] RETURNS [numBreaks: INT _ 0] = {

FOR lmr: Lmr IN Lmr DO
IF break.breaks[lmr] # NIL THEN numBreaks _ numBreaks + 1;
ENDLOOP};

ConvertToLORA: PROC [list: RouteChannel.ChanPinList] RETURNS[val: List.LORA] = {
val _ NIL;
UNTIL list = NIL DO
val _ CONS[list.first, val];
list _ list.rest;
ENDLOOP;
RETURN[val];
}; -- of ConvertToLORA

}.



ΞRouteChannelConstraintsImpl.mesa   
Copyright c 1985, 1986 by Xerox Corporation.  All rights reserved.
by Bryan Preas   July 10, 1985 6:57:00 pm PDT 
last edited by Bryan Preas   February 11, 1987 6:26:48 pm PST

run through the pins on the channel,
create segment constraints from the pin to pin relationships

return if no pins
outer loop can be removed whe constraints by seg is added
generate constraints for this coordinate, if any

now do constraints for doglegs and exits wrt the upper pins

first the upper pin, if any
do the exits wrt each other if this is a switchBox and a channel end
process pin to pin constraints
break any segments that must be in 2 tracks
IF index = chanPins.count THEN {
Must resolve constraints accross the ends of the switchbox.  If there is a constraint from a segment on one end to a segment on the other, it must be resolved.
these are the pins on the left side of the channel
these are the segments on the left pin
choose a segment to break and the position to dogleg
choose a segment to break and the position to dogleg
must explicitly destroy the old data
add a segment constraint if it does not create a loop
do upper to lower pin constraint
generate pin to pin constraints, process all segments attached to these pins
determining if pin1 actually constrains pin2
add a segment constraint if it does not create a loop
choose a segment to break and the position to dogleg
need to change so I don't add duplicate constraints
constrain Upper above Lower
arcName: Rope.ROPE _ Rope.Cat[upperSeg.net.name,"-above-", lowerSeg.net.name];
recursively go through the constraints
decide on which segment to divide and the position
run through the segs in the cycle. find the best
find the best position to break this seg
find the best position to break this seg within this range
see if a dogleg is allowed here
must reserve place for future exits
see if inner pins interfere
see if there are existing dog legs

see if outer pins interfere
see if any nets within th range cross the channels
see if a constraint loop is created
later --  for now dont use pin positions that could cause constraint loops
find the best exit to break this seg
evaluate the break of ths seg at break
break the segment at position:
add pin position at fullSegBreak.breaks[mumble].pos
unlink segBreak
create 2 new segments
link in the pins

if this segment already has an exit on this side, then use that one, otherwise make a new pin

remove these statments for production
RouteChannel.AuditPins[routingArea];
RouteChannel.AuditSegs[routingArea];
link the segment to the pin in the list and vice versa
update old seg pointer
chanPin.conctSeg[chanLeft] _ NIL
no old seg pointer, but make sure both segs on new pin are initialized
update old seg pointer
no old seg pointer, but make sure both segs on new pin are initialized
compute the track density when this range is added
compare r1 and r2
find the PinPosition closest to target.
get the pins attached to the segment on the indicated side
bottomList == lowerPinList and topList == upperPinList
Compiler problem: [pinLists.bottomList, pinLists.topList] _ AddToClosestList[[pinLists.bottomList, pinLists.topList], pin]};
first include the obvious pins: top, bottom and dogleg
next decide which segments the exit pins go in
next decide which segments the dogleg pins go in
Compiler problem: [pinLists.bottomList, pinLists.topList] _ AddToClosestList[[pinLists.bottomList, pinLists.topList], list.first];
find distinct ranges for this seg, use enumeration
-- ur:                   
-- lr:  
-- ur:          
-- lr:   
-- ur:      
lr:    
ur:    
-- lr:       
-- ur:    
-- lr:         
-- ur:    
-- lr:                         
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