haha it's been a while since i last committed, hasn't it

1 files changed, 1531 insertions, 0 deletions

diff --git a/compiler_and_linker/unsorted/IroExprRegeneration.c b/compiler_and_linker/unsorted/IroExprRegeneration.c
index e69de29..074510b 100644
--- a/compiler_and_linker/unsorted/IroExprRegeneration.c
+++ b/compiler_and_linker/unsorted/IroExprRegeneration.c
@@ -0,0 +1,1531 @@
+#include "compiler/IroExprRegeneration.h"
+#include "compiler/IroCSE.h"
+#include "compiler/IroDump.h"
+#include "compiler/IroFlowgraph.h"
+#include "compiler/IroLinearForm.h"
+#include "compiler/IroSubable.h"
+#include "compiler/IroTransform.h"
+#include "compiler/IROUseDef.h"
+#include "compiler/IroUtil.h"
+#include "compiler/IroVars.h"
+#include "compiler/CDecl.h"
+#include "compiler/CExpr.h"
+#include "compiler/CFunc.h"
+#include "compiler/CInt64.h"
+#include "compiler/CMachine.h"
+#include "compiler/CParser.h"
+#include "compiler/objects.h"
+
+// forward decls
+static void GetExprUses(IROLinear *linear, Boolean isEntry);
+static void RebuildPossibleCondExpression(IRONode *fnode);
+static void AddNodeAndSuccessorsRecursively(IRONodes *nodes, IRONode *fnode1, IRONode *fnode2);
+
+static Boolean FindFlowgraphNodeThatStartsWithLabel(CLabel *label, IRONode **result1, IRONode **result2) {
+    IRONode *prev;
+    IRONode *iter;
+
+    prev = IRO_FirstNode;
+    if (prev != NULL)
+        iter = prev->nextnode;
+
+    while (iter) {
+        if (iter->first->type == IROLinearLabel && iter->first->u.label.label == label) {
+            *result1 = iter;
+            *result2 = prev;
+            return 1;
+        }
+
+        prev = iter;
+        iter = iter->nextnode;
+    }
+
+    return 0;
+}
+
+static IROLinear *FindLastDiadicTopLevelAssignmentInFlowgraphNode(IRONode *fnode) {
+    IROLinear *scan;
+    IROLinear *result;
+
+    result = NULL;
+
+    for (scan = fnode->first; scan != fnode->last->next; scan = scan->next) {
+        if (scan->type == IROLinearOp2Arg && scan->nodetype == EASS && !(scan->flags & IROLF_Reffed))
+            result = scan;
+    }
+
+    return result;
+}
+
+static Boolean RewriteUse(IROUse *use, ENode *enode, IROLinear *nd, Boolean flag) {
+    IROLinear *father;
+    IROLinear *father2;
+
+    if (
+        use &&
+        use->x1C &&
+        use->linear &&
+        use->linear->type == IROLinearOperand &&
+        use->linear->u.node->type == EOBJREF &&
+        use->linear->u.node->data.objref == enode->data.objref &&
+        (father = IRO_LocateFather(use->linear)) &&
+        father->type == IROLinearOp1Arg &&
+        father->nodetype == EINDIRECT &&
+        father->rtype == nd->rtype &&
+        (father2 = IRO_LocateFather(father)) &&
+        ((father2->type != IROLinearOp1Arg && father2->type != IROLinearOp2Arg) || !IRO_IsModifyOp[father2->nodetype])
+        ) {
+        if (flag)
+            IRO_LocateFather_Cut_And_Paste(father, nd);
+        return 1;
+    }
+
+    return 0;
+}
+
+#ifdef __MWERKS__
+#pragma options align=mac68k
+#endif
+static struct {
+    jmp_buf buf;
+    UInt16 index;
+    Boolean flag;
+} scuai;
+#ifdef __MWERKS__
+#pragma options align=reset
+#endif
+
+static void StatementContainsUseAction(IROLinear *linear, Boolean isFirst) {
+    if (isFirst && linear->index == scuai.index) {
+        scuai.flag = 1;
+        longjmp(scuai.buf, 1);
+    }
+}
+
+static Boolean StatementContainsUse(IROLinear *a, IROLinear *b) {
+    memset(&scuai, 0, sizeof(scuai));
+    scuai.index = b->index;
+    scuai.flag = 0;
+
+    if (!setjmp(scuai.buf))
+        IRO_WalkInts(a, a, StatementContainsUseAction);
+
+    return scuai.flag;
+}
+
+#ifdef __MWERKS__
+#pragma options align=mac68k
+#endif
+static struct {
+    jmp_buf buf;
+    Boolean flag;
+} scseai;
+#ifdef __MWERKS__
+#pragma options align=reset
+#endif
+
+static void StatementContainsSideEffectAction(IROLinear *linear, Boolean isFirst) {
+    if (isFirst) {
+        switch (linear->type) {
+            case IROLinearOperand:
+            case IROLinearOp1Arg:
+            case IROLinearOp2Arg:
+            case IROLinearOp3Arg:
+            case IROLinearFunccall:
+            case IROLinearAsm:
+                if (IRO_HasSideEffect(linear)) {
+                    scseai.flag = 1;
+                    longjmp(scseai.buf, 1);
+                }
+                break;
+        }
+    }
+}
+
+static Boolean StatementContainsSideEffect(IROLinear *linear) {
+    memset(&scseai, 0, sizeof(scseai));
+    scseai.flag = 0;
+
+    if (!setjmp(scseai.buf))
+        IRO_WalkInts(linear, linear, StatementContainsSideEffectAction);
+
+    return scseai.flag;
+}
+
+static Boolean HasSideEffectsBeforeUse(IRONode *fnode1, IRONode *fnode2, IRONode *fnode3, IROLinear *nd, Boolean flag) {
+    IRONode *fnode;
+    IROLinear *scannd;
+    UInt16 i;
+
+    if (fnode1 != fnode3) {
+        if (flag) {
+            for (fnode = IRO_FirstNode; fnode; fnode = fnode->nextnode)
+                fnode->x3C = 0;
+        } else if (fnode1->x3C) {
+            return 0;
+        }
+        fnode1->x3C = 1;
+    }
+
+    for (scannd = fnode1->first; scannd && scannd != fnode1->last->next; scannd = scannd->next) {
+        if (!(scannd->flags & IROLF_Reffed)) {
+            if (StatementContainsUse(scannd, nd))
+                return 0;
+            if (StatementContainsSideEffect(scannd))
+                return 1;
+        }
+    }
+
+    if (fnode1 != fnode3) {
+        for (i = 0; i < fnode1->numsucc; i++) {
+            if (HasSideEffectsBeforeUse(IRO_NodeTable[fnode1->succ[i]], fnode2, fnode3, nd, 0))
+                return 1;
+        }
+    }
+
+    return 0;
+}
+
+static Boolean UsesAKilledVarBeforeUse(IRONode *fnode1, IRONode *fnode2, IRONode *fnode3, IROLinear *nd, BitVector *bv, Boolean flag) {
+    IRONode *fnode;
+    UInt16 i;
+    IROLinear *scannd;
+
+    if (fnode1 != fnode3) {
+        if (flag) {
+            for (fnode = IRO_FirstNode; fnode; fnode = fnode->nextnode)
+                fnode->x3C = 0;
+        } else if (fnode1->x3C) {
+            return 0;
+        }
+        fnode1->x3C = 1;
+    }
+
+    for (scannd = fnode1->first; scannd && scannd != fnode1->last->next; scannd = scannd->next) {
+        if (!(scannd->flags & IROLF_Reffed)) {
+            if (StatementContainsUse(scannd, nd))
+                return 0;
+            Bv_Clear(IRO_VarKills);
+            IRO_WalkInts(scannd, scannd, GetExprUses);
+            if (Bv_BitsInCommon(bv, IRO_VarKills))
+                return 1;
+        }
+    }
+
+    if (fnode1 != fnode3) {
+        for (i = 0; i < fnode1->numsucc; i++) {
+            if (UsesAKilledVarBeforeUse(IRO_NodeTable[fnode1->succ[i]], fnode2, fnode3, nd, bv, 0))
+                return 1;
+        }
+    }
+
+    return 0;
+}
+
+static void GetExprUses(IROLinear *linear, Boolean isEntry) {
+    Object *obj;
+    VarRecord *var;
+
+    if (isEntry) {
+        if (linear->type == IROLinearOperand && linear->u.node->type == EOBJREF) {
+            obj = linear->u.node->data.objref;
+            if ((linear->flags & IROLF_Ind) && (!(linear->flags & IROLF_Assigned) || (linear->flags & IROLF_Used))) {
+                if ((var = IRO_FindVar(obj, 0, 1)))
+                    Bv_SetBit(var->index, IRO_VarKills);
+            }
+        }
+    }
+}
+
+static void GetExprKills(IROLinear *linear, Boolean isEntry) {
+    if (isEntry)
+        IRO_GetKills(linear);
+}
+
+static void CheckUnorderedRegionForSideEffectsAndUses(IROLinear *nd, BitVector *bv1, BitVector *bv2, Boolean *result) {
+    if (IRO_HasSideEffect(nd)) {
+        *result = 1;
+    } else {
+        Bv_Clear(bv2);
+        Bv_Clear(IRO_VarKills);
+        IRO_WalkTree(nd, GetExprUses);
+        Bv_Or(IRO_VarKills, bv2);
+
+        if (Bv_BitsInCommon(bv1, bv2))
+            *result = 1;
+    }
+}
+
+static void CheckUnorderedRegionsForSideEffectsAndUses(IROLinear *nd1, IROLinear *nd2, BitVector *bv1, BitVector *bv2, Boolean *result) {
+    int i;
+
+    switch (nd1->type) {
+        case IROLinearOp2Arg:
+            if (nd1->nodetype != ELAND && nd1->nodetype != ELOR && nd1->nodetype != ECOMMA) {
+                if (nd1->u.diadic.left != nd2)
+                    CheckUnorderedRegionForSideEffectsAndUses(nd1->u.diadic.left, bv1, bv2, result);
+                if (nd1->u.diadic.right != nd2)
+                    CheckUnorderedRegionForSideEffectsAndUses(nd1->u.diadic.right, bv1, bv2, result);
+            }
+            break;
+        case IROLinearFunccall:
+            if (nd1->u.funccall.linear8 != nd2)
+                CheckUnorderedRegionForSideEffectsAndUses(nd1->u.funccall.linear8, bv1, bv2, result);
+            for (i = 0; !*result && i < nd1->u.funccall.argCount; i++) {
+                if (nd1->u.funccall.args[i] != nd2)
+                    CheckUnorderedRegionForSideEffectsAndUses(nd1->u.funccall.args[i], bv1, bv2, result);
+            }
+            break;
+    }
+}
+
+static Boolean CheckThenOrElseBranch(IRONode *fnode1, IRONode *fnode2, IROLinear *nd, Boolean flag) {
+    IRONode *fnode;
+    IROLinear *scannd;
+    IRONodes nodes;
+    Boolean result;
+
+    IROFlowgraph_sub_4C2140(&nodes);
+
+    for (fnode = IRO_FirstNode; fnode; fnode = fnode->nextnode)
+        fnode->x3C = 0;
+    AddNodeAndSuccessorsRecursively(&nodes, fnode1, fnode2);
+
+    while (IROFlowgraph_sub_4C2040(&nodes)) {
+        fnode = IRO_NodeTable[IROFlowgraph_sub_4C2100(&nodes)];
+        if (fnode) {
+            if (!Bv_IsBitSet(fnode1->index, fnode->dom)) {
+                result = 0;
+                goto done;
+            }
+
+            for (scannd = fnode->first; scannd && scannd != fnode->last->next; scannd = scannd->next) {
+                if (!nd || scannd != nd) {
+                    if (!flag || (scannd->type != IROLinearReturn)) {
+                        if (fnode->numpred == 2 && scannd->type == IROLinearLabel)
+                            RebuildPossibleCondExpression(fnode);
+
+                        if (scannd->type != IROLinearNop &&
+                            scannd->type != IROLinearLabel &&
+                            scannd->type != IROLinearGoto &&
+                            !(scannd->flags & IROLF_Reffed)) {
+                            result = 0;
+                            goto done;
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    result = 1;
+done:
+    IROFlowgraph_sub_4C20E0(&nodes);
+    return result;
+}
+
+static void RebuildPossibleCondExpression(IRONode *fnode) {
+    IRONode *pred1;
+    IRONode *pred2;
+    IRONode *r30;
+    IROLinear *leftAss;
+    IROLinear *rightAss;
+    IROLinear *r27;
+    IROLinear *r13;
+    IROLinear *var_58;
+    IRONode *left;
+    IRONode *right;
+    IRONode *r24;
+    ENode *r23;
+    IRODef *r22;
+    IRODef *r21;
+    IRODef *def;
+    IROUse *use;
+    UInt32 r20;
+    UInt32 r19;
+    Boolean r18;
+    Boolean r17;
+    UInt32 i;
+    Boolean compareType;
+    Type *var_60;
+    IROLinear copy1;
+    IROLinear copy2;
+    IROLinear copy3;
+
+    if (
+        !fnode ||
+        fnode->numpred != 2 ||
+        !fnode->first ||
+        fnode->first->type != IROLinearLabel
+        )
+        return;
+
+    pred1 = IRO_NodeTable[fnode->pred[0]];
+    pred2 = IRO_NodeTable[fnode->pred[1]];
+    if (
+        !pred1 || !pred2 ||
+        pred1->numsucc != 1 || pred2->numsucc != 1
+        )
+        return;
+
+    r24 = NULL;
+    for (i = 0; i < IRO_NumNodes; i++) {
+        if (
+            Bv_IsBitSet(i, fnode->dom) &&
+            (r24 = IRO_NodeTable[i]) &&
+            r24->last &&
+            (r24->last->type == IROLinearIf || r24->last->type == IROLinearIfNot) &&
+            r24->last->u.label.label &&
+            r24->numsucc == 2
+            ) {
+            if (Bv_IsBitSet(r24->succ[0], pred1->dom) &&
+                !Bv_IsBitSet(r24->succ[0], pred2->dom) &&
+                Bv_IsBitSet(r24->succ[1], pred2->dom) &&
+                !Bv_IsBitSet(r24->succ[1], pred1->dom))
+                break;
+
+            if (Bv_IsBitSet(r24->succ[0], pred2->dom) &&
+                !Bv_IsBitSet(r24->succ[0], pred1->dom) &&
+                Bv_IsBitSet(r24->succ[1], pred1->dom) &&
+                !Bv_IsBitSet(r24->succ[1], pred2->dom))
+                break;
+        }
+    }
+
+    if (i >= IRO_NumNodes)
+        return;
+
+    /*if (
+        (r30 = IRO_NodeTable[r24->succ[0]]) &&
+        r30->numpred == 1 &&
+        r30->first &&
+        r30->first->type == IROLinearLabel &&
+        r30->first->u.label.label == r24->last->u.label.label
+        ) {
+        goto ok;
+    } else if (
+        (r30 = IRO_NodeTable[r24->succ[1]]) &&
+        r30->numpred == 1 &&
+        r30->first &&
+        r30->first->type == IROLinearLabel &&
+        r30->first->u.label.label == r24->last->u.label.label
+        ) {
+        goto ok;
+    } else {
+        return;
+    }*/
+    /*if (
+        (!(r30 = IRO_NodeTable[r24->succ[0]]) ||
+        r30->numpred != 1 ||
+        !r30->first ||
+        r30->first->type != IROLinearLabel ||
+        r30->first->u.label.label != r24->last->u.label.label)
+        &&
+        (!(r30 = IRO_NodeTable[r24->succ[1]]) ||
+        r30->numpred != 1 ||
+        !r30->first ||
+        r30->first->type != IROLinearLabel ||
+        r30->first->u.label.label != r24->last->u.label.label)
+        )
+        return;*/
+    r30 = IRO_NodeTable[r24->succ[0]];
+    if (
+        r30 &&
+        r30->numpred == 1 &&
+        r30->first &&
+        r30->first->type == IROLinearLabel &&
+        r30->first->u.label.label == r24->last->u.label.label
+        ) {
+        (void)0;
+    } else {
+        r30 = IRO_NodeTable[r24->succ[1]];
+        if (
+            r30 &&
+            r30->numpred == 1 &&
+            r30->first &&
+            r30->first->type == IROLinearLabel &&
+            r30->first->u.label.label == r24->last->u.label.label
+            ) {
+        } else {
+            return;
+        }
+    }
+
+ok:
+    if (Bv_IsBitSet(r30->index, pred1->dom)) {
+        left = pred2;
+        right = pred1;
+    } else {
+        left = pred1;
+        right = pred2;
+    }
+
+    leftAss = FindLastDiadicTopLevelAssignmentInFlowgraphNode(left);
+    if (
+        !leftAss ||
+        leftAss->type != IROLinearOp2Arg ||
+        !leftAss->u.diadic.left ||
+        leftAss->u.diadic.left->type != IROLinearOp1Arg ||
+        leftAss->u.diadic.left->nodetype != EINDIRECT ||
+        !leftAss->u.diadic.left->u.monadic ||
+        leftAss->u.diadic.left->u.monadic->type != IROLinearOperand ||
+        !(r23 = leftAss->u.diadic.left->u.monadic->u.node) ||
+        !r23->rtype ||
+        !IS_TYPE_POINTER_ONLY(r23->rtype) ||
+        !r23->data.objref ||
+        is_volatile_object(r23->data.objref) ||
+        r23->data.objref->datatype != DLOCAL
+        )
+        r23 = NULL;
+
+    if (r23) {
+        rightAss = FindLastDiadicTopLevelAssignmentInFlowgraphNode(right);
+        if (
+            !rightAss ||
+            rightAss->type != IROLinearOp2Arg ||
+            !rightAss->u.diadic.left ||
+            rightAss->u.diadic.left->type != IROLinearOp1Arg ||
+            rightAss->u.diadic.left->nodetype != EINDIRECT ||
+            !rightAss->u.diadic.left->u.monadic ||
+            rightAss->u.diadic.left->u.monadic->type != IROLinearOperand ||
+            !rightAss->u.diadic.left->u.monadic->u.node ||
+            !rightAss->u.diadic.left->u.monadic->u.node->rtype ||
+            !IS_TYPE_POINTER_ONLY(rightAss->u.diadic.left->u.monadic->u.node->rtype) ||
+            rightAss->u.diadic.left->u.monadic->u.node->type != EOBJREF ||
+            rightAss->u.diadic.left->u.monadic->u.node->data.objref != r23->data.objref ||
+            rightAss->rtype != leftAss->rtype
+            )
+            r23 = NULL;
+    }
+
+    if (r23) {
+        if (!CheckThenOrElseBranch(r24->nextnode, left, leftAss, 0) || !CheckThenOrElseBranch(r30, right, rightAss, 0))
+            return;
+
+        r19 = 0;
+        r20 = 0;
+        r18 = 0;
+        r17 = 0;
+        if (!r23->data.objref->varptr || !r23->data.objref->varptr->uses || !r23->data.objref->varptr->defs) {
+            r23 = NULL;
+        } else {
+            r21 = NULL;
+            r22 = NULL;
+            for (def = r23->data.objref->varptr->defs; def && (!r22 || !r21); def = def->varnext) {
+                if (def->x18 && def->linear == leftAss)
+                    r22 = def;
+                else if (def->x18 && def->linear == rightAss)
+                    r21 = def;
+            }
+
+            if (!r22 || !r21) {
+                r23 = NULL;
+            } else {
+                for (use = r23->data.objref->varptr->uses; r23 && use; use = use->varnext) {
+                    if (use->x1C) {
+                        r20++;
+                        if (Bv_IsBitSet(r22->index, use->x18) && Bv_IsBitSet(r21->index, use->x18)) {
+                            for (i = 0; r23 && i < use->x18->size; i++) {
+                                if (i != r22->index && i != r21->index && Bv_IsBitSet(i, use->x18))
+                                    r23 = NULL;
+                            }
+
+                            if (r23 && !Bv_IsBitSet(fnode->index, use->node->dom))
+                                r23 = NULL;
+
+                            if (r23) {
+                                if (RewriteUse(use, r23, rightAss, 0))
+                                    r19++;
+                                else
+                                    r23 = NULL;
+                            }
+
+                            if (r23 && !r17)
+                                r17 = HasSideEffectsBeforeUse(fnode, fnode, use->node, use->linear, 1);
+
+                            if (r23 && !r18 && (IRO_HasSideEffect(r24->last->u.label.x4) || IRO_HasSideEffect(leftAss->u.label.x4) ||
+                                                IRO_HasSideEffect(rightAss->u.label.x4)))
+                                r18 = 1;
+                        } else if (Bv_IsBitSet(r22->index, use->x18) || Bv_IsBitSet(r21->index, use->x18)) {
+                            r23 = NULL;
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    if (!r23)
+        return;
+
+    compareType = r24->last->type == IROLinearIf;
+    r27 = r24->last->u.label.x4;
+    r13 = leftAss->u.label.x4;
+    var_58 = rightAss->u.label.x4;
+    var_60 = rightAss->rtype;
+    memcpy(&copy1, r13, sizeof(IROLinear));
+    memcpy(&copy2, rightAss, sizeof(IROLinear));
+
+    r24->last->type = IROLinearNop;
+    r24->last->expr = NULL;
+    r30->first->type = IROLinearNop;
+    r30->first->expr = NULL;
+    fnode->first->type = IROLinearNop;
+    fnode->first->expr = NULL;
+    if (left->last->type == IROLinearGoto) {
+        left->last->type = IROLinearNop;
+        left->last->expr = NULL;
+    }
+    if (right->last->type == IROLinearGoto) {
+        right->last->type = IROLinearNop;
+        right->last->expr = NULL;
+    }
+
+    if (r23) {
+        IRO_NopOut(leftAss->u.diadic.left);
+        leftAss->type = IROLinearNop;
+        leftAss->expr = NULL;
+    }
+
+    memcpy(rightAss, &copy1, sizeof(IROLinear));
+    rightAss->type = IROLinearOp3Arg;
+    rightAss->nodetype = ECOND;
+    rightAss->index = copy2.index;
+    rightAss->u.args3.a = r27;
+    rightAss->rtype = var_60;
+    rightAss->next = copy2.next;
+    if (compareType) {
+        rightAss->u.args3.b = var_58;
+        rightAss->u.args3.c = r13;
+    } else {
+        rightAss->u.args3.b = r13;
+        rightAss->u.args3.c = var_58;
+    }
+    rightAss->flags |= IROLF_Reffed;
+
+    if (r19 == 1 && !r17 && !r18 && !r23->data.objref->varptr->xB) {
+        for (use = r23->data.objref->varptr->uses; use; use = use->varnext) {
+            if (use->x1C && Bv_IsBitSet(r22->index, use->x18) && Bv_IsBitSet(r21->index, use->x18)) {
+                RewriteUse(use, r23, rightAss, 1);
+                if ((r18 = (use->linear->flags & IROLF_4000) && IRO_HasSideEffect(r27))) {
+                    IROLinear *tmp;
+                    Object *obj;
+
+                    tmp = IRO_NewLinear(IROLinearOperand);
+                    memcpy(tmp, copy2.u.diadic.left->u.monadic, sizeof(IROLinear));
+                    tmp->index = IRO_NumLinear++;
+                    tmp->rtype = r27->rtype;
+                    if (r20 == 1) {
+                        tmp->u.node->data.objref->type = r27->rtype;
+                        tmp->u.node->rtype = CDecl_NewPointerType(r27->rtype);
+                    } else {
+                        obj = create_temp_object(tmp->rtype);
+                        IRO_FindVar(obj, 1, 1);
+                        tmp->u.node = create_objectrefnode(obj);
+                    }
+                    IRO_PasteAfter(tmp, tmp, r27);
+
+                    tmp = IRO_NewLinear(IROLinearOp1Arg);
+                    memcpy(tmp, copy2.u.diadic.left, sizeof(IROLinear));
+                    tmp->index = IRO_NumLinear++;
+                    tmp->u.monadic = r27->next;
+                    tmp->rtype = r27->rtype;
+                    IRO_PasteAfter(tmp, tmp, r27->next);
+
+                    tmp = IRO_NewLinear(IROLinearOp2Arg);
+                    memcpy(tmp, &copy2, sizeof(IROLinear));
+                    tmp->index = IRO_NumLinear++;
+                    tmp->u.diadic.right = r27;
+                    tmp->u.diadic.left = r27->next->next;
+                    tmp->rtype = r27->rtype;
+                    IRO_PasteAfter(tmp, tmp, r27->next->next);
+
+                    if (r20 != 1) {
+                        tmp = copy2.u.diadic.left->u.monadic;
+                        tmp->u.node = create_objectrefnode(obj);
+                    }
+
+                    rightAss->u.args3.a = copy2.u.diadic.left;
+                    rightAss->u.args3.a->rtype = r27->rtype;
+
+                    if (r20 == 1) {
+                        r21->linear = r27->next->next;
+                        if (Bv_IsBitSet(r21->index, right->x1A)) {
+                            Bv_ClearBit(r21->index, right->x1A);
+                            Bv_SetBit(r21->index, r24->x1A);
+                        }
+                        if (Bv_IsBitSet(r21->index, right->x1E)) {
+                            Bv_ClearBit(r21->index, right->x1E);
+                            Bv_SetBit(r21->index, r24->x1E);
+                        }
+                        if (Bv_IsBitSet(r21->index, right->x22)) {
+                            Bv_ClearBit(r21->index, right->x22);
+                            Bv_SetBit(r21->index, r24->x22);
+                        }
+                    }
+                }
+            }
+        }
+
+        if (!r18) {
+            if (r20 == 1 && r23->data.objref->u.var.info) {
+                r23->data.objref->u.var.info->usage = 0;
+                r23->data.objref->u.var.info->used = 0;
+            }
+            r22->x18 = 0;
+            IRO_NopOut(copy2.u.diadic.left);
+            r21->x18 = 0;
+        }
+    } else {
+        memcpy(&copy3, fnode->first, sizeof(IROLinear));
+        memcpy(fnode->first, &copy2, sizeof(IROLinear));
+
+        fnode->first->index = copy3.index;
+        fnode->first->u.diadic.right = rightAss;
+        fnode->first->next = copy3.next;
+        r22->x18 = 0;
+        r21->linear = fnode->first;
+        if (Bv_IsBitSet(r21->index, right->x1A)) {
+            Bv_ClearBit(r21->index, right->x1A);
+            Bv_SetBit(r21->index, fnode->x1A);
+        }
+        if (Bv_IsBitSet(r21->index, right->x1E)) {
+            Bv_ClearBit(r21->index, right->x1E);
+            Bv_SetBit(r21->index, fnode->x1E);
+        }
+        if (Bv_IsBitSet(r21->index, right->x22)) {
+            Bv_ClearBit(r21->index, right->x22);
+            Bv_SetBit(r21->index, fnode->x22);
+        }
+    }
+}
+
+static void RebuildPossibleReturnCondExpression(IRONode *fnode) {
+    IRONode *succ1;
+    IRONode *succ2;
+    IROLinear *node1;
+    IROLinear *node2;
+    IROLinear *node3;
+    IRONode *r27;
+    Boolean isIf;
+    Type *type;
+    IROList list;
+
+    if (
+        !fnode ||
+        fnode->numsucc != 2 ||
+        !fnode->last ||
+        (fnode->last->type != IROLinearIf && fnode->last->type != IROLinearIfNot)
+        )
+        return;
+
+    succ1 = IRO_NodeTable[fnode->succ[0]];
+    succ2 = IRO_NodeTable[fnode->succ[1]];
+    if (
+        !succ1 || !succ2 ||
+        succ1->numsucc != 0 || succ1->numpred != 1 ||
+        succ2->numsucc != 0 || succ2->numpred != 1
+        )
+        return;
+
+    if (succ1->first && succ1->first->type == IROLinearLabel && succ1->first->u.label.label == fnode->last->u.label.label) {
+        r27 = succ1;
+    } else if (succ2->first && succ2->first->type == IROLinearLabel && succ2->first->u.label.label == fnode->last->u.label.label) {
+        r27 = succ2;
+    } else {
+        return;
+    }
+
+    if (r27->numpred != 1)
+        return;
+
+    if (!CheckThenOrElseBranch(fnode->nextnode, fnode->nextnode, NULL, 1) || !CheckThenOrElseBranch(r27, r27, NULL, 1))
+        return;
+
+    if (
+        !fnode->nextnode->last ||
+        fnode->nextnode->last->type != IROLinearReturn ||
+        !fnode->nextnode->last->u.monadic ||
+        !r27->last ||
+        r27->last->type != IROLinearReturn ||
+        !r27->last->u.monadic ||
+        !IRO_TypesEqual(fnode->nextnode->last->u.monadic->rtype, r27->last->u.monadic->rtype)
+        )
+        return;
+
+    isIf = fnode->last->type == IROLinearIf;
+    node1 = fnode->last->u.diadic.right;
+    node2 = fnode->nextnode->last->u.diadic.left;
+    node3 = r27->last->u.diadic.left;
+    type = node2->rtype;
+
+    fnode->last->type = IROLinearNop;
+    fnode->last->expr = NULL;
+    r27->last->type = IROLinearNop;
+    r27->last->expr = NULL;
+    r27->first->type = IROLinearNop;
+    r27->first->expr = NULL;
+
+    if (IRO_IsIntConstant(node2) && IRO_IsIntConstant(node3) &&
+        ((IRO_IsConstantOne(node2) && IRO_IsConstantZero(node3)) ||
+         (IRO_IsConstantZero(node2) && IRO_IsConstantOne(node3)))) {
+        if (!(node1->type == IROLinearOp1Arg && node1->nodetype == ELOGNOT && node1->rtype == type)) {
+            IROLinear *tmp1;
+            IROLinear *tmp2;
+
+            tmp1 = IRO_NewLinear(IROLinearOp1Arg);
+            memcpy(tmp1, node2, sizeof(IROLinear));
+            tmp1->type = IROLinearOp1Arg;
+            tmp1->nodetype = ELOGNOT;
+            tmp1->index = IRO_NumLinear++;
+            tmp1->u.monadic = node1;
+
+            tmp1->next = tmp2 = IRO_NewLinear(IROLinearOp1Arg);
+            memcpy(tmp2, node2, sizeof(IROLinear));
+            tmp2->type = IROLinearOp1Arg;
+            tmp2->nodetype = ELOGNOT;
+            tmp2->index = IRO_NumLinear++;
+            tmp2->u.monadic = tmp1;
+
+            IRO_PasteAfter(tmp1, tmp2, node1);
+            node1 = tmp2;
+        }
+
+        if ((IRO_IsConstantZero(node2) && !isIf) || (IRO_IsConstantOne(node2) && isIf)) {
+            if (node1->type == IROLinearOp1Arg && node1->nodetype == ELOGNOT && node1->rtype == node1->u.monadic->rtype) {
+                IROLinear *tmp = node1;
+                node1 = node1->u.monadic;
+                tmp->type = IROLinearNop;
+                tmp->expr = NULL;
+            } else {
+                IROLinear *tmp = IRO_NewLinear(IROLinearOp1Arg);
+                memcpy(tmp, node2, sizeof(IROLinear));
+                tmp->type = IROLinearOp1Arg;
+                tmp->nodetype = ELOGNOT;
+                tmp->index = IRO_NumLinear++;
+                tmp->u.monadic = node1;
+                IRO_PasteAfter(tmp, tmp, node1);
+                node1 = tmp;
+            }
+        }
+
+        node2->type = IROLinearNop;
+        node2->expr = NULL;
+        node3->type = IROLinearNop;
+        node3->expr = NULL;
+        fnode->nextnode->last->u.monadic = node1;
+    } else {
+        IROLinear *tmp1;
+        IROLinear *tmp2;
+
+        IRO_InitList(&list);
+        tmp1 = IRO_DuplicateExpr(node3, &list);
+        IRO_NopOut(node3);
+        IRO_Paste(list.head, list.tail, fnode->nextnode->last);
+
+        tmp2 = IRO_NewLinear(IROLinearOp3Arg);
+        memcpy(tmp2, node2, sizeof(IROLinear));
+        tmp2->type = IROLinearOp3Arg;
+        tmp2->nodetype = ECOND;
+        tmp2->index = IRO_NumLinear++;
+        tmp2->u.args3.a = node1;
+        tmp2->rtype = type;
+        IRO_Paste(tmp2, tmp2, fnode->nextnode->last);
+
+        if (isIf) {
+            tmp2->u.args3.b = tmp1;
+            tmp2->u.args3.c = node2;
+        } else {
+            tmp2->u.args3.b = node2;
+            tmp2->u.args3.c = tmp1;
+        }
+
+        fnode->nextnode->last->u.monadic = tmp2;
+    }
+}
+
+static void RebuildCondExpressions(void) {
+    IRONode *fnode;
+
+    for (fnode = IRO_FirstNode; fnode; fnode = fnode->nextnode) {
+        if (fnode->numpred == 2) {
+            if (fnode->first && fnode->first->type == IROLinearLabel)
+                RebuildPossibleCondExpression(fnode);
+        } else if (fnode->numsucc == 2) {
+            if (fnode->last && (fnode->last->type == IROLinearIf || fnode->last->type == IROLinearIfNot))
+                RebuildPossibleReturnCondExpression(fnode);
+        }
+    }
+
+    IRO_CheckForUserBreak();
+}
+
+static Boolean IsLogicalExpressionAssign(IROLinear *nd) {
+    IROLinear *right;
+    IROLinear *left;
+
+    return (
+        nd->type == IROLinearOp2Arg &&
+        nd->nodetype == EASS &&
+        (left = nd->u.diadic.left) &&
+        (right = nd->u.diadic.right) &&
+        right->type == IROLinearOperand &&
+        right->u.node &&
+        right->u.node->type == EINTCONST &&
+        (CInt64_Equal(right->u.node->data.intval, cint64_one) || CInt64_Equal(right->u.node->data.intval, cint64_zero)) &&
+        left->type == IROLinearOp1Arg &&
+        left->nodetype == EINDIRECT &&
+        left->u.monadic &&
+        IS_TYPE_POINTER_ONLY(left->u.monadic->rtype) &&
+        left->u.monadic->type == IROLinearOperand &&
+        left->u.monadic->u.node &&
+        left->u.monadic->u.node->type == EOBJREF &&
+        left->u.monadic->u.node->data.objref &&
+        left->u.monadic->u.node->data.objref->datatype == DLOCAL);
+}
+
+static Boolean IsPossibleLogicalExpressionStart(IRONode *fnode, IROLinear *nd) {
+    return
+        fnode->numsucc == 2 &&
+        fnode->last &&
+        (fnode->last->type == IROLinearIf || fnode->last->type == IROLinearIfNot) &&
+        IsLogicalExpressionAssign(nd);
+}
+
+static Boolean CheckForTopLevelExpressions(IRONode *fnode1, IRONode *fnode2, IRONode *fnode3, IROLinear *nd1, IROLinear *nd2, Boolean flag) {
+    IRONode *fnode;
+    IROLinear *nd;
+    UInt16 i;
+
+    if (fnode1 != fnode3) {
+        if (!Bv_IsBitSet(fnode2->index, fnode1->dom))
+            return 0;
+
+        if (flag) {
+            for (fnode = IRO_FirstNode; fnode; fnode = fnode->nextnode)
+                fnode->x3C = 0;
+        } else if (fnode1->x3C) {
+            return 1;
+        }
+        fnode1->x3C = 1;
+
+        for (i = 0; i < fnode1->numsucc; i++) {
+            fnode = IRO_NodeTable[fnode1->succ[i]];
+            if (!CheckForTopLevelExpressions(fnode, fnode2, fnode3, fnode->first, nd2, 0))
+                return 0;
+        }
+    }
+
+    for (nd = nd1; nd && nd != fnode1->last->next; nd = nd->next) {
+        if (nd == nd2)
+            return 1;
+
+        if (nd->type != IROLinearNop && nd->type != IROLinearLabel && !(nd->flags & IROLF_Reffed))
+            return 0;
+    }
+
+    return 1;
+}
+
+static void AddNodeAndSuccessorsRecursively(IRONodes *nodes, IRONode *fnode1, IRONode *fnode2) {
+    UInt16 i;
+
+    if (fnode1 && !fnode1->x3C) {
+        fnode1->x3C = 1;
+        IROFlowgraph_sub_4C3880(nodes, fnode1->index);
+        if (fnode1 != fnode2) {
+            for (i = 0; i < fnode1->numsucc; i++)
+                AddNodeAndSuccessorsRecursively(nodes, IRO_NodeTable[fnode1->succ[i]], fnode2);
+        }
+    }
+}
+
+static Boolean RebuildPossibleLogicalExpression(IRONode *fnode, IROLinear *nd) {
+    IROUse *use;
+    IROLinear *nd2;
+    IROLinear *left;
+    IROLinear *right;
+    IRONode *r25;
+    IRONode *r24;
+    ENode *objnode;
+    IRODef *def1;
+    IRODef *def2;
+    UInt32 useCount;
+    UInt32 rewrittenUseCount;
+    Boolean sideEffectFlag;
+    IROLinearType compareType;
+    CLabel *somelab;
+    IRONode *var_68;
+    IRONode *var_6C;
+    CInt64 compareVal;
+    Boolean killedFlag;
+    BitVector *bv1;
+    BitVector *bv2;
+
+    IROLinear *father;
+    IROLinear *iter;
+    IRODef *def;
+    UInt32 i;
+    IROLinear *newlin;
+
+    objnode = nd->u.diadic.left->u.monadic->u.node;
+    if (!objnode->data.objref->varptr)
+        return 0;
+
+    if (CInt64_Equal(nd->u.diadic.right->u.node->data.intval, cint64_zero)) {
+        compareType = IROLinearIfNot;
+        compareVal = cint64_one;
+    } else {
+        compareType = IROLinearIf;
+        compareVal = cint64_zero;
+    }
+
+    var_68 = NULL;
+    def1 = NULL;
+    for (def = objnode->data.objref->varptr->defs; def && !def1; def = def->varnext) {
+        if (def->x18 && def->linear == nd)
+            def1 = def;
+    }
+
+    if (def1) {
+        for (use = objnode->data.objref->varptr->uses; use; use = use->varnext) {
+            if (use->x1C == 2 && Bv_IsBitSet(def1->index, use->x18)) {
+                if (!var_68) {
+                    var_68 = use->node;
+                } else if (Bv_IsBitSet(use->node->index, var_68->dom)) {
+                    var_68 = use->node;
+                }
+            }
+        }
+
+        if (var_68) {
+            for (use = objnode->data.objref->varptr->uses; use; use = use->varnext) {
+                if (use->node != var_68 && use->x1C == 2 && Bv_IsBitSet(def1->index, use->x18) && !Bv_IsBitSet(var_68->index, use->node->dom)) {
+                    var_68 = NULL;
+                    break;
+                }
+            }
+        }
+    }
+
+    if (
+        !var_68 ||
+        !var_68->first ||
+        var_68->first->type != IROLinearLabel ||
+        !(somelab = var_68->first->u.label.label) ||
+        var_68->numpred != 3
+        )
+        return 0;
+
+    r25 = IRO_NodeTable[var_68->pred[0]];
+    if (Bv_IsBitSet(IRO_NodeTable[var_68->pred[1]]->index, r25->dom)) {
+        r25 = IRO_NodeTable[var_68->pred[1]];
+    } else if (!Bv_IsBitSet(r25->index, IRO_NodeTable[var_68->pred[1]]->dom)) {
+        return 0;
+    }
+
+    if (Bv_IsBitSet(IRO_NodeTable[var_68->pred[2]]->index, r25->dom)) {
+        r25 = IRO_NodeTable[var_68->pred[2]];
+    } else if (!Bv_IsBitSet(r25->index, IRO_NodeTable[var_68->pred[2]]->dom)) {
+        return 0;
+    }
+
+    if (
+        !r25 ||
+        !(left = r25->last) ||
+        left->type != compareType ||
+        left->u.label.label != somelab
+        )
+        return 0;
+
+    if (
+        !FindFlowgraphNodeThatStartsWithLabel(left->u.label.label, &var_68, &var_6C) ||
+        !var_6C ||
+        var_6C->numpred != 1 ||
+        !(r24 = IRO_NodeTable[var_6C->pred[0]]) ||
+        !(right = r24->last) ||
+        right->type != compareType ||
+        right->u.label.label != left->u.label.label ||
+        !(nd2 = FindLastDiadicTopLevelAssignmentInFlowgraphNode(var_6C)) ||
+        !IsLogicalExpressionAssign(nd2) ||
+        nd2->u.diadic.left->u.monadic->u.node->data.objref != objnode->data.objref ||
+        !CInt64_Equal(compareVal, nd2->u.diadic.right->u.node->data.intval) ||
+        nd2->rtype != nd->rtype
+        )
+        return 0;
+
+    if (
+        !CheckForTopLevelExpressions(fnode, fnode, r25, nd->next, left, 1) ||
+        !CheckForTopLevelExpressions(r25->nextnode, r25->nextnode, r24, r25->nextnode->first, right, 1) ||
+        !CheckForTopLevelExpressions(r24->nextnode, r24->nextnode, var_6C, right->next, nd2, 1) ||
+        !CheckForTopLevelExpressions(var_6C, var_6C, var_6C, nd2->next, var_68->first, 1)
+        )
+        return 0;
+
+    rewrittenUseCount = 0;
+    useCount = 0;
+    killedFlag = 0;
+    sideEffectFlag = 0;
+    if (!objnode->data.objref->varptr || !(objnode->data.objref->varptr->uses) || !(objnode->data.objref->varptr->defs)) {
+        objnode = NULL;
+    } else {
+        def1 = def2 = NULL;
+        for (def = objnode->data.objref->varptr->defs; def && (!def1 || !def2); def = def->varnext) {
+            if (def->x18 && def->linear == nd)
+                def1 = def;
+            else if (def->x18 && def->linear == nd2)
+                def2 = def;
+        }
+
+        if (!def1 || !def2) {
+            objnode = NULL;
+        } else {
+            for (use = objnode->data.objref->varptr->uses; objnode && use; use = use->varnext) {
+                if (use->x1C) {
+                    useCount++;
+                    if (Bv_IsBitSet(def1->index, use->x18) && Bv_IsBitSet(def2->index, use->x18)) {
+                        for (i = 0; objnode && i < use->x18->size; i++) {
+                            if (i != def1->index && i != def2->index && Bv_IsBitSet(i, use->x18))
+                                objnode = NULL;
+                        }
+
+                        if (objnode && !Bv_IsBitSet(var_68->index, use->node->dom))
+                            objnode = NULL;
+
+                        if (objnode) {
+                            if (RewriteUse(use, objnode, nd2, 0))
+                                rewrittenUseCount++;
+                            else
+                                objnode = NULL;
+                        }
+
+                        if (objnode) {
+                            if (!sideEffectFlag)
+                                sideEffectFlag = HasSideEffectsBeforeUse(var_68, var_68, use->node, use->linear, 1);
+
+                            if (!killedFlag && (IRO_HasSideEffect(left->u.label.x4) || IRO_HasSideEffect(right->u.label.x4))) {
+                                iter = use->linear;
+                                if ((father = IRO_LocateFather(use->linear))) {
+                                    Bv_AllocVector(&bv1, IRO_NumVars + 1);
+                                    Bv_AllocVector(&bv2, IRO_NumVars + 1);
+                                    Bv_AllocVector(&IRO_VarKills, IRO_NumVars + 1);
+                                    IRO_WalkTree(left->u.label.x4, GetExprKills);
+                                    IRO_WalkTree(right->u.label.x4, GetExprKills);
+                                    Bv_Or(IRO_VarKills, bv1);
+                                    while (father && !killedFlag) {
+                                        CheckUnorderedRegionsForSideEffectsAndUses(father, iter, bv1, bv2, &killedFlag);
+                                        iter = father;
+                                        father = IRO_LocateFather(father);
+                                    }
+                                }
+
+                                if (!killedFlag)
+                                    killedFlag = UsesAKilledVarBeforeUse(var_68, var_68, use->node, use->linear, bv1, 1);
+                            }
+                        }
+                    } else if (Bv_IsBitSet(def1->index, use->x18) || Bv_IsBitSet(def2->index, use->x18))
+                        objnode = NULL;
+                }
+            }
+        }
+    }
+
+    if (!objnode)
+        return 0;
+
+    left->type = right->type = IROLinearNop;
+    left->expr = right->expr = NULL;
+
+    IRO_NopOut(nd);
+
+    newlin = IRO_NewLinear(IROLinearOp2Arg);
+    memcpy(newlin, nd2, sizeof(IROLinear));
+    newlin->nodetype = (compareType == IROLinearIf) ? ELOR : ELAND;
+    newlin->index = IRO_NumLinear++;
+    newlin->u.diadic.left = left->u.label.x4;
+    newlin->u.diadic.right = right->u.label.x4;
+    newlin->flags |= IROLF_Reffed;
+    IRO_Paste(newlin, newlin, nd2);
+
+    if (rewrittenUseCount == 1 && !sideEffectFlag && !killedFlag && !objnode->data.objref->varptr->xB) {
+        for (use = objnode->data.objref->varptr->uses; use; use = use->varnext) {
+            if (use->x1C && Bv_IsBitSet(def1->index, use->x18) && Bv_IsBitSet(def2->index, use->x18))
+                RewriteUse(use, objnode, newlin, 1);
+        }
+
+        if (useCount == 1 && objnode->data.objref->u.var.info) {
+            objnode->data.objref->u.var.info->usage = 0;
+            objnode->data.objref->u.var.info->used = 0;
+        }
+        IRO_NopOut(nd2);
+        def1->x18 = 0;
+        def2->x18 = 0;
+    } else {
+        IRO_NopOut(nd2->u.label.x4);
+        nd2->u.label.x4 = newlin;
+        def1->x18 = 0;
+    }
+
+    if (r24->numpred == 1 && IRO_NodeTable[r24->pred[0]] == r25 && IRO_MergeFlowGraphNodes(r25, r24))
+        r24 = r25;
+    if (var_6C->numpred == 1 && IRO_NodeTable[var_6C->pred[0]] == r24 && IRO_MergeFlowGraphNodes(r24, var_6C))
+        var_6C = r24;
+    if (var_68->numpred == 1 && r24 == r25 && var_6C == r24)
+        IRO_MergeFlowGraphNodes(var_6C, var_68);
+    return 1;
+}
+
+static void RebuildLogicalExpressions(void) {
+    IRONode *fnode;
+    IROLinear *nd;
+    Boolean flag;
+
+    flag = 1;
+    while (flag) {
+        flag = 0;
+        for (fnode = IRO_FirstNode; fnode && fnode->last; fnode = fnode->nextnode) {
+            for (nd = fnode->first; nd && nd != fnode->last->next; nd = nd->next) {
+                if (IsPossibleLogicalExpressionStart(fnode, nd) && RebuildPossibleLogicalExpression(fnode, nd))
+                    flag = 1;
+            }
+        }
+    }
+
+    IRO_CheckForUserBreak();
+}
+
+static Boolean IsPossibleCondAssStart(IRONode *fnode) {
+    return (fnode->numsucc == 2) && fnode->last && (fnode->last->type == IROLinearIf || fnode->last->type == IROLinearIfNot);
+}
+
+static Type *logicalType(void) {
+    if (copts.cplusplus && copts.booltruefalse)
+        return TYPE(&stbool);
+    else
+        return TYPE(&stsignedint);
+}
+
+static Boolean GeneratePossibleCondAss(IRONode *fnode) {
+    IROLinear *r31;
+    IRONode *node2;
+    IRONode *r29;
+    Boolean r28;
+    IRONode *node1;
+    IROLinear *r24;
+    Boolean r23;
+    IROLinear *r19;
+    Boolean r18;
+    IROLinear *r20;
+    Boolean r19flag;
+    IROLinear *r18nd;
+    IROLinear *ass;
+    IROLinear *cond;
+    IROLinear *r16;
+    IROLinear *r15;
+    BitVector *saveVarKills;
+    IROList list;
+    Object *obj;
+    IROLinear *r14;
+
+    if (!fnode || fnode->numsucc != 2 || !fnode->last || (fnode->last->type != IROLinearIf && fnode->last->type != IROLinearIfNot))
+        return 0;
+
+    if (IRO_NodeTable[fnode->succ[0]] &&
+        IRO_NodeTable[fnode->succ[0]]->first &&
+        IRO_NodeTable[fnode->succ[0]]->first->type == IROLinearLabel &&
+        IRO_NodeTable[fnode->succ[0]]->first->u.label.label == fnode->last->u.label.label) {
+        node1 = IRO_NodeTable[fnode->succ[0]];
+        node2 = IRO_NodeTable[fnode->succ[1]];
+    } else {
+        node1 = IRO_NodeTable[fnode->succ[1]];
+        if (node1 && node1->first && node1->first->type == IROLinearLabel && node1->first->u.label.label == fnode->last->u.label.label) {
+            node2 = IRO_NodeTable[fnode->succ[0]];
+        } else {
+            return 0;
+        }
+    }
+
+    if (!node2 || node2->numpred != 1 || node2->numsucc != 1 || node2->last->next != node1->first)
+        return 0;
+
+    if (IRO_NodeTable[node2->succ[0]] == node1 && Bv_IsBitSet(fnode->index, node1->dom)) {
+        r28 = 0;
+    } else if (
+        node1->numpred == 1 && node1->numsucc == 1 &&
+        node2->succ[0] == node1->succ[0] &&
+        (r29 = IRO_NodeTable[node2->succ[0]]) &&
+        Bv_IsBitSet(fnode->index, r29->dom) &&
+        node1->last->next == r29->first
+        ) {
+        r28 = 1;
+    } else {
+        return 0;
+    }
+
+    r24 = NULL;
+    if (node2->last) {
+        for (r19 = node2->first; r19 && r19 != node2->last->next; r19 = r19->next) {
+            if (IRO_IsAssignment(r19) && !(r19->flags & IROLF_Reffed) && !r24) {
+                r24 = r19;
+            } else if (r19->type != IROLinearNop && r19->type != IROLinearLabel && r19->type != IROLinearGoto && !(r19->flags & IROLF_Reffed)) {
+                return 0;
+            }
+        }
+    }
+
+    if (
+        !r24 ||
+            (r24->nodetype != EASS && !IRO_TransformSelfAssignmentToAssignment(r24)) ||
+            !r24->u.diadic.left ||
+            r24->u.diadic.left->type != IROLinearOp1Arg ||
+            r24->u.diadic.left->nodetype != EINDIRECT ||
+            !r24->u.diadic.left->u.monadic ||
+            r24->u.diadic.left->u.monadic->type != IROLinearOperand ||
+            !r24->u.diadic.left->u.monadic->u.node ||
+            !r24->u.diadic.left->u.monadic->u.node->rtype ||
+            !IS_TYPE_POINTER_ONLY(r24->u.diadic.left->u.monadic->u.node->rtype) ||
+            !r24->u.diadic.left->u.monadic->u.node->data.monadic
+        )
+        return 0;
+
+    if (r28) {
+        r31 = NULL;
+        if (node1->last) {
+            for (r19 = node1->first; r19 && r19 != node1->last->next; r19 = r19->next) {
+                if (IRO_IsAssignment(r19) && !(r19->flags & IROLF_Reffed) && !r31) {
+                    r31 = r19;
+                } else if (r19->type != IROLinearNop && r19->type != IROLinearLabel && r19->type != IROLinearGoto && !(r19->flags & IROLF_Reffed)) {
+                    return 0;
+                }
+            }
+        }
+
+        if (
+            !r31 ||
+            (r31->nodetype != EASS && !IRO_TransformSelfAssignmentToAssignment(r31)) ||
+            !r31->u.diadic.left ||
+            r31->u.diadic.left->type != IROLinearOp1Arg ||
+            r31->u.diadic.left->nodetype != EINDIRECT ||
+            !r31->u.diadic.left->u.monadic ||
+            r31->u.diadic.left->u.monadic->type != IROLinearOperand ||
+            !r31->u.diadic.left->u.monadic->u.node ||
+            !r31->u.diadic.left->u.monadic->u.node->rtype ||
+            !IS_TYPE_POINTER_ONLY(r31->u.diadic.left->u.monadic->u.node->rtype) ||
+            !r31->u.diadic.left->u.monadic->u.node->data.monadic
+            )
+            return 0;
+
+        r18 = IRO_ExprsSame(r24->u.diadic.left, r31->u.diadic.left);
+    }
+
+    r23 = fnode->last->type == IROLinearIf;
+    r20 = fnode->last->u.diadic.right;
+    r19flag = 0;
+    if (r28 && copts.opt_common_subs && IRO_IsSubableExpression(r20))
+        r19flag = 1;
+
+    if (r19flag) {
+        IRO_FindDepends(r20);
+        r19flag = !IRO_NotSubable;
+    }
+
+    if (r28) {
+        if (r18) {
+            r19flag = 0;
+        } else if (IRO_HasSideEffect(r20)) {
+            r19flag = 1;
+        } else {
+            Bv_AllocVector(&IRO_VarKills, IRO_NumVars + 1);
+            IRO_WalkTree(r20, GetExprUses);
+            saveVarKills = IRO_VarKills;
+            Bv_AllocVector(&IRO_VarKills, IRO_NumVars + 1);
+            IRO_WalkTree(r20, GetExprKills);
+            if (Bv_BitsInCommon(IRO_VarKills, saveVarKills))
+                r19flag = 1;
+        }
+
+        if (r19flag && !copts.opt_common_subs)
+            return 0;
+    }
+
+    if (r19flag) {
+        IRO_InitList(&list);
+        obj = create_temp_object(r20->rtype);
+        IRO_FindVar(obj, 1, 1);
+        ass = IRO_NewLinear(IROLinearOp2Arg);
+        ass->u.diadic.left = IRO_TempReference(obj, &list);
+        ass->rtype = r20->rtype;
+        ass->nodetype = EASS;
+        ass->index = ++IRO_NumLinear;
+        ass->u.diadic.left->flags |= IROLF_Ind | IROLF_Assigned;
+        ass->u.diadic.left->u.monadic->flags |= IROLF_Ind | IROLF_Assigned;
+        ass->u.diadic.right = r20;
+        IRO_AddToList(ass, &list);
+        IRO_PasteAfter(list.head, list.tail, r20);
+    }
+
+    r16 = r24->u.diadic.left;
+    r15 = r24->u.diadic.right;
+    fnode->last->type = IROLinearNop;
+    fnode->last->expr = NULL;
+    if (node2->last->type == IROLinearGoto) {
+        node2->last->type = IROLinearNop;
+        node2->last->expr = NULL;
+    }
+    if (r28 || node1->numpred == 2) {
+        node1->first->type = IROLinearNop;
+        node1->first->expr = NULL;
+    }
+
+    if (r28 && r18) {
+        if (node1->last->type == IROLinearGoto) {
+            node1->last->type = IROLinearNop;
+            node1->last->expr = NULL;
+        }
+        if (r29->numpred == 2) {
+            r29->first->type = IROLinearNop;
+            r29->first->expr = NULL;
+        }
+
+        cond = IRO_NewLinear(IROLinearOp3Arg);
+        memcpy(cond, r24, sizeof(IROLinear));
+        cond->type = IROLinearOp3Arg;
+        cond->nodetype = ECOND;
+        cond->index = ++IRO_NumLinear;
+        cond->rtype = r16->rtype;
+        cond->flags |= IROLF_Reffed;
+        if (r19flag) {
+            IRO_InitList(&list);
+            r14 = IRO_TempReference(obj, &list);
+            IRO_Paste(list.head, list.tail, r31);
+        } else {
+            r14 = r20;
+        }
+        cond->u.args3.a = r14;
+
+        if (r23) {
+            cond->u.args3.b = r31->u.diadic.right;
+            cond->u.args3.c = r15;
+        } else {
+            cond->u.args3.b = r15;
+            cond->u.args3.c = r31->u.diadic.right;
+        }
+
+        r24->type = IROLinearNop;
+        r24->expr = NULL;
+        IRO_NopOut(r24->u.diadic.left);
+        IRO_Paste(cond, cond, r31);
+        r31->u.diadic.right = cond;
+    } else {
+        r24->type = IROLinearOp3Arg;
+        r24->nodetype = ECONDASS;
+        if (r19flag) {
+            IRO_InitList(&list);
+            r20 = IRO_TempReference(obj, &list);
+            IRO_Paste(list.head, list.tail, r24);
+        }
+        cond = r20;
+        if (r23) {
+            r18nd = IRO_NewLinear(IROLinearOp1Arg);
+            memcpy(r18nd, r20, sizeof(IROLinear));
+            r18nd->type = IROLinearOp1Arg;
+            r18nd->nodetype = ELOGNOT;
+            r18nd->index = ++IRO_NumLinear;
+            r18nd->rtype = logicalType();
+            r18nd->u.monadic = r20;
+            r18nd->flags |= IROLF_Reffed;
+            IRO_Paste(r18nd, r18nd, r24);
+            r20 = r18nd;
+        }
+        r24->u.args3.a = r20;
+        r24->u.args3.b = r16;
+        r24->u.args3.c = r15;
+        if (r28) {
+            r15 = r31->u.diadic.left;
+            r16 = r31->u.diadic.right;
+            if (node1->last->type == IROLinearGoto) {
+                node1->last->type = IROLinearNop;
+                node1->last->expr = NULL;
+            }
+            if (r29->numpred == 2) {
+                r29->first->type = IROLinearNop;
+                r29->first->expr = NULL;
+            }
+            r31->type = IROLinearOp3Arg;
+            r31->nodetype = ECONDASS;
+            if (r19flag) {
+                IRO_InitList(&list);
+                cond = IRO_TempReference(obj, &list);
+                IRO_Paste(list.head, list.tail, r31);
+            } else {
+                IRO_InitList(&list);
+                cond = IRO_DuplicateExpr(cond, &list);
+                IRO_Paste(list.head, list.tail, r31);
+            }
+            if (!r23) {
+                r14 = IRO_NewLinear(IROLinearOp1Arg);
+                memcpy(r14, cond, sizeof(IROLinear));
+                r14->type = IROLinearOp1Arg;
+                r14->nodetype = ELOGNOT;
+                r14->index = ++IRO_NumLinear;
+                r14->rtype = logicalType();
+                r14->u.monadic = cond;
+                r14->flags |= IROLF_Reffed;
+                IRO_Paste(r14, r14, r31);
+                cond = r14;
+            }
+            r31->u.args3.a = cond;
+            r31->u.args3.b = r15;
+            r31->u.args3.c = r16;
+        }
+    }
+
+    if (IRO_MergeFlowGraphNodes(fnode, node2))
+        node2 = fnode;
+    if ((r28 || node1->numpred == 1) && IRO_MergeFlowGraphNodes(node2, node1))
+        node1 = node2;
+    if (r28 && r29->numpred == 1)
+        IRO_MergeFlowGraphNodes(node1, r29);
+    return 1;
+}
+
+static void GenerateCondAssignments(void) {
+    IRONode *fnode;
+
+    fnode = IRO_FirstNode;
+    while (fnode && fnode->last) {
+        if (IsPossibleCondAssStart(fnode)) {
+            if (!GeneratePossibleCondAss(fnode))
+                fnode = fnode->nextnode;
+        } else {
+            fnode = fnode->nextnode;
+        }
+    }
+
+    IRO_CheckForUserBreak();
+}
+
+void IRO_RegenerateExpressions(void) {
+    IRO_UpdateFlagsOnInts();
+    IRO_ComputeSuccPred();
+    IRO_ComputeDom();
+    IRO_UseDef(0, 0);
+
+    if (copts.optimizationlevel > 0) {
+        IRO_Dump("Rebuilding ELORs and ELANDs\n");
+        RebuildLogicalExpressions();
+        IRO_DumpAfterPhase("RebuildLogicalExpressions", 0);
+    }
+
+    if (copts.optimizationlevel > 0) {
+        IRO_Dump("Rebuilding ECONDs\n");
+        RebuildCondExpressions();
+        IRO_DumpAfterPhase("RebuildCondExpressions", 0);
+    }
+
+    if (copts.optimizationlevel > 0) {
+        IRO_Dump("Generating ECONDASSes\n");
+        GenerateCondAssignments();
+        IRO_DumpAfterPhase("GenerateCondAssignments", 0);
+    }
+}