X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=src%2Fcc65%2Fcodeent.c;h=13b7aed146701f961315ee240d2aa8b49bc34109;hb=dbb9a31fd908fe85fd9d4ccf1397564a3d027953;hp=1594c80330e2df96779bc212b7436d509a3d78d8;hpb=0b08eb0e6869a736e3015b161d715c02f6d21bfc;p=cc65

diff --git a/src/cc65/codeent.c b/src/cc65/codeent.c
index 1594c8033..13b7aed14 100644
--- a/src/cc65/codeent.c
+++ b/src/cc65/codeent.c
@@ -6,10 +6,10 @@
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
-/* (C) 2001     Ullrich von Bassewitz                                        */
-/*              Wacholderweg 14                                              */
-/*              D-70597 Stuttgart                                            */
-/* EMail:       uz@musoftware.de                                             */
+/* (C) 2001-2005, Ullrich von Bassewitz                                      */
+/*                Römerstrasse 52                                            */
+/*                D-70794 Filderstadt                                        */
+/* EMail:         uz@cc65.org                                                */
 /*                                                                           */
 /*                                                                           */
 /* This software is provided 'as-is', without any expressed or implied       */
@@ -39,7 +39,9 @@
 /* common */
 #include "chartype.h"
 #include "check.h"
+#include "debugflag.h"
 #include "xmalloc.h"
+#include "xsprintf.h"
 
 /* cc65 */
 #include "codeinfo.h"
@@ -136,19 +138,73 @@ static int NumArg (const char* Arg, unsigned long* Num)
 static void SetUseChgInfo (CodeEntry* E, const OPCDesc* D)
 /* Set the Use and Chg in E */
 {
+    const ZPInfo* Info;
+
     /* If this is a subroutine call, or a jump to an external function,
      * lookup the information about this function and use it. The jump itself
      * does not change any registers, so we don't need to use the data from D.
      */
-    if ((E->Info & (OF_BRA | OF_CALL)) != 0 && E->JumpTo == 0) {
+    if ((E->Info & (OF_UBRA | OF_CALL)) != 0 && E->JumpTo == 0) {
      	/* A subroutine call or jump to external symbol (function exit) */
      	GetFuncInfo (E->Arg, &E->Use, &E->Chg);
     } else {
      	/* Some other instruction. Use the values from the opcode description
-	 * plus addressing mode info
+	 * plus addressing mode info.
 	 */
      	E->Use = D->Use | GetAMUseInfo (E->AM);
 	E->Chg = D->Chg;
+
+	/* Check for special zero page registers used */
+	switch (E->AM) {
+
+	    case AM65_ACC:
+		if (E->OPC == OP65_ASL || E->OPC == OP65_DEC ||
+		    E->OPC == OP65_INC || E->OPC == OP65_LSR ||
+		    E->OPC == OP65_ROL || E->OPC == OP65_ROR) {
+		    /* A is changed by these insns */
+		    E->Chg |= REG_A;
+		}
+                break;
+
+	    case AM65_ZP:
+	    case AM65_ABS:
+	    /* Be conservative: */
+	    case AM65_ZPX:
+	    case AM65_ABSX:
+	    case AM65_ABSY:
+	        Info = GetZPInfo (E->Arg);
+	        if (Info && Info->ByteUse != REG_NONE) {
+		    if (E->OPC == OP65_ASL || E->OPC == OP65_DEC ||
+		       	E->OPC == OP65_INC || E->OPC == OP65_LSR ||
+		       	E->OPC == OP65_ROL || E->OPC == OP65_ROR ||
+		       	E->OPC == OP65_TRB || E->OPC == OP65_TSB) {
+		       	/* The zp loc is both, input and output */
+		       	E->Chg |= Info->ByteUse;
+		       	E->Use |= Info->ByteUse;
+		    } else if ((E->Info & OF_STORE) != 0) {
+		       	/* Just output */
+		       	E->Chg |= Info->ByteUse;
+		    } else {
+		       	/* Input only */
+		       	E->Use |= Info->ByteUse;
+		    }
+		}
+	        break;
+
+	    case AM65_ZPX_IND:
+	    case AM65_ZP_INDY:
+	    case AM65_ZP_IND:
+	        Info = GetZPInfo (E->Arg);
+	        if (Info && Info->ByteUse != REG_NONE) {
+		    /* These addressing modes will never change the zp loc */
+		    E->Use |= Info->WordUse;
+		}
+	        break;
+
+	    default:
+	        /* Keep gcc silent */
+	        break;
+	}
     }
 }
 
@@ -160,6 +216,21 @@ static void SetUseChgInfo (CodeEntry* E, const OPCDesc* D)
 
 
 
+const char* MakeHexArg (unsigned Num)
+/* Convert Num into a string in the form $XY, suitable for passing it as an
+ * argument to NewCodeEntry, and return a pointer to the string.
+ * BEWARE: The function returns a pointer to a static buffer, so the value is
+ * gone if you call it twice (and apart from that it's not thread and signal
+ * safe).
+ */
+{
+    static char Buf[16];
+    xsprintf (Buf, sizeof (Buf), "$%02X", (unsigned char) Num);
+    return Buf;
+}
+
+
+
 CodeEntry* NewCodeEntry (opc_t OPC, am_t AM, const char* Arg,
 	   		 CodeLabel* JumpTo, LineInfo* LI)
 /* Create a new code entry, initialize and return it */
@@ -173,10 +244,10 @@ CodeEntry* NewCodeEntry (opc_t OPC, am_t AM, const char* Arg,
     /* Initialize the fields */
     E->OPC    = D->OPC;
     E->AM     = AM;
+    E->Size   = GetInsnSize (E->OPC, E->AM);
     E->Arg    = GetArgCopy (Arg);
-    E->Flags  = NumArg (E->Arg, &E->Num)? CEF_NUMARG : 0;
+    E->Flags  = NumArg (E->Arg, &E->Num)? CEF_NUMARG : 0;   /* Needs E->Arg */
     E->Info   = D->Info;
-    E->Size   = GetInsnSize (E->OPC, E->AM);
     E->JumpTo = JumpTo;
     E->LI     = UseLineInfo (LI);
     E->RI     = 0;
@@ -235,7 +306,7 @@ void CE_ReplaceOPC (CodeEntry* E, opc_t OPC)
 int CodeEntriesAreEqual (const CodeEntry* E1, const CodeEntry* E2)
 /* Check if both code entries are equal */
 {
-    return E1->OPC == E2->OPC && E1->AM == E2->AM && strcmp (E1->Arg, E2->Arg) == 0;
+    return (E1->OPC == E2->OPC && E1->AM == E2->AM && strcmp (E1->Arg, E2->Arg) == 0);
 }
 
 
@@ -252,6 +323,22 @@ void CE_AttachLabel (CodeEntry* E, CodeLabel* L)
 
 
 
+void CE_ClearJumpTo (CodeEntry* E)
+/* Clear the JumpTo entry and the argument (which contained the name of the
+ * label). Note: The function will not clear the backpointer from the label,
+ * so use it with care.
+ */
+{
+    /* Clear the JumpTo entry */
+    E->JumpTo = 0;
+
+    /* Clear the argument and assign the empty one */
+    FreeArg (E->Arg);
+    E->Arg = EmptyArg;
+}
+
+
+
 void CE_MoveLabel (CodeLabel* L, CodeEntry* E)
 /* Move the code label L from it's former owner to the code entry E. */
 {
@@ -266,7 +353,7 @@ void CE_MoveLabel (CodeLabel* L, CodeEntry* E)
 
 
 void CE_SetArg (CodeEntry* E, const char* Arg)
-/* Set a new argument for the given code entry. An old string is deleted. */
+/* Replace the argument by the new one. */
 {
     /* Free the old argument */
     FreeArg (E->Arg);
@@ -277,19 +364,127 @@ void CE_SetArg (CodeEntry* E, const char* Arg)
 
 
 
-int CE_KnownImm (const CodeEntry* E)
-/* Return true if the argument of E is a known immediate value */
+void CE_SetNumArg (CodeEntry* E, long Num)
+/* Set a new numeric argument for the given code entry that must already
+ * have a numeric argument.
+ */
+{
+    char Buf[16];
+
+    /* Check that the entry has a numerical argument */
+    CHECK (E->Flags & CEF_NUMARG);
+
+    /* Make the new argument string */
+    if (E->Size == 2) {
+	Num &= 0xFF;
+    	xsprintf (Buf, sizeof (Buf), "$%02X", (unsigned) Num);
+    } else if (E->Size == 3) {
+	Num &= 0xFFFF;
+    	xsprintf (Buf, sizeof (Buf), "$%04X", (unsigned) Num);
+    } else {
+    	Internal ("Invalid instruction size in CE_SetNumArg");
+    }
+
+    /* Replace the argument by the new one */
+    CE_SetArg (E, Buf);
+
+    /* Use the new numerical value */
+    E->Num = Num;
+}
+
+
+
+int CE_IsConstImm (const CodeEntry* E)
+/* Return true if the argument of E is a constant immediate value */
 {
     return (E->AM == AM65_IMM && (E->Flags & CEF_NUMARG) != 0);
 }
 
 
 
+int CE_IsKnownImm (const CodeEntry* E, unsigned long Num)
+/* Return true if the argument of E is a constant immediate value that is
+ * equal to Num.
+ */
+{
+    return E->AM == AM65_IMM            &&
+           (E->Flags & CEF_NUMARG) != 0 &&
+           E->Num == Num;
+}
+
+
+
+int CE_UseLoadFlags (const CodeEntry* E)
+/* Return true if the instruction uses any flags that are set by a load of
+ * a register (N and Z).
+ */
+{
+    /* Follow unconditional branches, but beware of endless loops. After this,
+     * E will point to the first entry that is not a branch.
+     */
+    if (E->Info & OF_UBRA) {
+        Collection C = AUTO_COLLECTION_INITIALIZER;
+
+        /* Follow the chain */
+        while (E->Info & OF_UBRA) {
+
+            /* Remember the entry so we can detect loops */
+            CollAppend (&C, (void*) E);
+
+            /* Check the target */
+            if (E->JumpTo == 0 || CollIndex (&C, E->JumpTo->Owner) >= 0) {
+                /* Unconditional jump to external symbol, or endless loop. */
+                DoneCollection (&C);
+                return 0;       /* Flags not used */
+            }
+
+            /* Follow the chain */
+            E = E->JumpTo->Owner;
+        }
+
+        /* Delete the collection */
+        DoneCollection (&C);
+    }
+
+    /* A branch will use the flags */
+    if (E->Info & OF_FBRA) {
+        return 1;
+    }
+
+    /* Call of a boolean transformer routine will also use the flags */
+    if (E->OPC == OP65_JSR) {
+        /* Get the condition that is evaluated and check it */
+        switch (FindBoolCmpCond (E->Arg)) {
+            case CMP_EQ:
+            case CMP_NE:
+            case CMP_GT:
+            case CMP_GE:
+            case CMP_LT:
+            case CMP_LE:
+            case CMP_UGT:
+            case CMP_ULE:
+                /* Will use the N or Z flags */
+                return 1;
+
+
+            case CMP_UGE:       /* Uses only carry */
+            case CMP_ULT:       /* Dito */
+            default:            /* No bool transformer subroutine */
+                return 0;
+        }
+    }
+
+    /* Anything else */
+    return 0;
+}
+
+
+
 void CE_FreeRegInfo (CodeEntry* E)
 /* Free an existing register info struct */
 {
     if (E->RI) {
-	FreeRegInfo (E->RI);
+       	FreeRegInfo (E->RI);
 	E->RI = 0;
     }
 }
@@ -306,7 +501,7 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
     RegContents* Out;
 
     /* Function register usage */
-    unsigned char Use, Chg;
+    unsigned short Use, Chg;
 
     /* If we don't have a register info struct, allocate one. */
     if (E->RI == 0) {
@@ -331,22 +526,64 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 	    /* We don't know the value of the carry, so the result is
 	     * always unknown.
 	     */
-	    Out->RegA = -1;
+	    Out->RegA = UNKNOWN_REGVAL;
 	    break;
 
 	case OP65_AND:
-       	    if (In->RegA >= 0) {
-		if (CE_KnownImm (E)) {
+       	    if (RegValIsKnown (In->RegA)) {
+		if (CE_IsConstImm (E)) {
 		    Out->RegA = In->RegA & (short) E->Num;
+		} else if (E->AM == AM65_ZP) {
+		    switch (GetKnownReg (E->Use & REG_ZP, In)) {
+		    	case REG_TMP1:
+		    	    Out->RegA = In->RegA & In->Tmp1;
+		    	    break;
+			case REG_PTR1_LO:
+			    Out->RegA = In->RegA & In->Ptr1Lo;
+			    break;
+			case REG_PTR1_HI:
+			    Out->RegA = In->RegA & In->Ptr1Hi;
+			    break;
+			case REG_SREG_LO:
+			    Out->RegA = In->RegA & In->SRegLo;
+			    break;
+			case REG_SREG_HI:
+			    Out->RegA = In->RegA & In->SRegHi;
+			    break;
+		    	default:
+		    	    Out->RegA = UNKNOWN_REGVAL;
+		     	    break;
+		    }
 		} else {
-		    Out->RegA = -1;
+		    Out->RegA = UNKNOWN_REGVAL;
 		}
 	    }
 	    break;
 
 	case OP65_ASL:
-	    if (E->AM == AM65_ACC && In->RegA >= 0) {
+	    if (E->AM == AM65_ACC && RegValIsKnown (In->RegA)) {
 		Out->RegA = (In->RegA << 1) & 0xFF;
+	    } else if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+		    case REG_TMP1:
+			Out->Tmp1 = (In->Tmp1 << 1) & 0xFF;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = (In->Ptr1Lo << 1) & 0xFF;
+			break;
+		    case REG_PTR1_HI:
+			Out->Ptr1Hi = (In->Ptr1Hi << 1) & 0xFF;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = (In->SRegLo << 1) & 0xFF;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = (In->SRegHi << 1) & 0xFF;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
 	    }
 	    break;
 
@@ -405,60 +642,123 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 	    break;
 
 	case OP65_DEA:
-	    if (In->RegA >= 0) {
-	    	Out->RegA = In->RegA - 1;
+       	    if (RegValIsKnown (In->RegA)) {
+	    	Out->RegA = (In->RegA - 1) & 0xFF;
 	    }
 	    break;
 
 	case OP65_DEC:
-	    if (E->AM == AM65_ACC && In->RegA >= 0) {
-	    	Out->RegA = In->RegA - 1;
+	    if (E->AM == AM65_ACC && RegValIsKnown (In->RegA)) {
+	    	Out->RegA = (In->RegA - 1) & 0xFF;
+	    } else if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+		    case REG_TMP1:
+			Out->Tmp1 = (In->Tmp1 - 1) & 0xFF;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = (In->Ptr1Lo - 1) & 0xFF;
+			break;
+		    case REG_PTR1_HI:
+			Out->Ptr1Hi = (In->Ptr1Hi - 1) & 0xFF;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = (In->SRegLo - 1) & 0xFF;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = (In->SRegHi - 1) & 0xFF;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
 	    }
 	    break;
 
 	case OP65_DEX:
-       	    if (In->RegX >= 0) {
-	    	Out->RegX = In->RegX - 1;
+       	    if (RegValIsKnown (In->RegX)) {
+	    	Out->RegX = (In->RegX - 1) & 0xFF;
 	    }
 	    break;
 
 	case OP65_DEY:
-       	    if (In->RegY >= 0) {
-	    	Out->RegY = In->RegY - 1;
+       	    if (RegValIsKnown (In->RegY)) {
+	    	Out->RegY = (In->RegY - 1) & 0xFF;
 	    }
 	    break;
 
 	case OP65_EOR:
-       	    if (In->RegA >= 0) {
-		if (CE_KnownImm (E)) {
+       	    if (RegValIsKnown (In->RegA)) {
+		if (CE_IsConstImm (E)) {
 		    Out->RegA = In->RegA ^ (short) E->Num;
+		} else if (E->AM == AM65_ZP) {
+		    switch (GetKnownReg (E->Use & REG_ZP, In)) {
+		    	case REG_TMP1:
+		    	    Out->RegA = In->RegA ^ In->Tmp1;
+		    	    break;
+			case REG_PTR1_LO:
+			    Out->RegA = In->RegA ^ In->Ptr1Lo;
+			    break;
+			case REG_PTR1_HI:
+			    Out->RegA = In->RegA ^ In->Ptr1Hi;
+			    break;
+			case REG_SREG_LO:
+			    Out->RegA = In->RegA ^ In->SRegLo;
+			    break;
+			case REG_SREG_HI:
+			    Out->RegA = In->RegA ^ In->SRegHi;
+			    break;
+		    	default:
+		    	    Out->RegA = UNKNOWN_REGVAL;
+		    	    break;
+		    }
 		} else {
-		    Out->RegA = -1;
+		    Out->RegA = UNKNOWN_REGVAL;
 		}
 	    }
 	    break;
 
 	case OP65_INA:
-	    if (In->RegA >= 0) {
-		Out->RegA = In->RegA + 1;
+	    if (RegValIsKnown (In->RegA)) {
+		Out->RegA = (In->RegA + 1) & 0xFF;
 	    }
 	    break;
 
 	case OP65_INC:
-	    if (E->AM == AM65_ACC && In->RegA >= 0) {
-		Out->RegA = In->RegA + 1;
+	    if (E->AM == AM65_ACC && RegValIsKnown (In->RegA)) {
+	     	Out->RegA = (In->RegA + 1) & 0xFF;
+	    } else if (E->AM == AM65_ZP) {
+	     	switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+		    case REG_TMP1:
+			Out->Tmp1 = (In->Tmp1 + 1) & 0xFF;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = (In->Ptr1Lo + 1) & 0xFF;
+			break;
+		    case REG_PTR1_HI:
+		    	Out->Ptr1Hi = (In->Ptr1Hi + 1) & 0xFF;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = (In->SRegLo + 1) & 0xFF;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = (In->SRegHi + 1) & 0xFF;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
 	    }
 	    break;
 
 	case OP65_INX:
-	    if (In->RegX >= 0) {
-		Out->RegX = In->RegX + 1;
+	    if (RegValIsKnown (In->RegX)) {
+		Out->RegX = (In->RegX + 1) & 0xFF;
 	    }
 	    break;
 
 	case OP65_INY:
-	    if (In->RegY >= 0) {
-		Out->RegY = In->RegY + 1;
+	    if (RegValIsKnown (In->RegY)) {
+		Out->RegY = (In->RegY + 1) & 0xFF;
 	    }
 	    break;
 
@@ -487,14 +787,47 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 	    /* Get the code info for the function */
 	    GetFuncInfo (E->Arg, &Use, &Chg);
 	    if (Chg & REG_A) {
-		Out->RegA = -1;
+		Out->RegA = UNKNOWN_REGVAL;
 	    }
 	    if (Chg & REG_X) {
-		Out->RegX = -1;
+		Out->RegX = UNKNOWN_REGVAL;
 	    }
 	    if (Chg & REG_Y) {
-		Out->RegY = -1;
+		Out->RegY = UNKNOWN_REGVAL;
+	    }
+	    if (Chg & REG_TMP1) {
+		Out->Tmp1 = UNKNOWN_REGVAL;
+	    }
+            if (Chg & REG_PTR1_LO) {
+	     	Out->Ptr1Lo = UNKNOWN_REGVAL;
+	    }
+	    if (Chg & REG_PTR1_HI) {
+	     	Out->Ptr1Hi = UNKNOWN_REGVAL;
+	    }
+            if (Chg & REG_SREG_LO) {
+	     	Out->SRegLo = UNKNOWN_REGVAL;
 	    }
+	    if (Chg & REG_SREG_HI) {
+	     	Out->SRegHi = UNKNOWN_REGVAL;
+	    }
+       	    /* ## FIXME: Quick hack for some known functions: */
+	    if (strcmp (E->Arg, "tosandax") == 0) {
+		if (In->RegA == 0) {
+		    Out->RegA = 0;
+		}
+		if (In->RegX == 0) {
+		    Out->RegX = 0;
+		}
+	    } else if (strcmp (E->Arg, "tosorax") == 0) {
+		if (In->RegA == 0xFF) {
+		    Out->RegA = 0xFF;
+		}
+		if (In->RegX == 0xFF) {
+                    Out->RegX = 0xFF;
+                }
+            } else if (FindBoolCmpCond (E->Arg) != CMP_INV) {
+                Out->RegX = 0;
+            }
 	    break;
 
 	case OP65_JVC:
@@ -504,35 +837,119 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 	    break;
 
 	case OP65_LDA:
-	    if (CE_KnownImm (E)) {
-		Out->RegA = (unsigned char) E->Num;
+	    if (CE_IsConstImm (E)) {
+	     	Out->RegA = (unsigned char) E->Num;
+	    } else if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Use & REG_ZP, In)) {
+		    case REG_TMP1:
+			Out->RegA = In->Tmp1;
+			break;
+		    case REG_PTR1_LO:
+			Out->RegA = In->Ptr1Lo;
+			break;
+		    case REG_PTR1_HI:
+			Out->RegA = In->Ptr1Hi;
+			break;
+		    case REG_SREG_LO:
+			Out->RegA = In->SRegLo;
+			break;
+		    case REG_SREG_HI:
+			Out->RegA = In->SRegHi;
+			break;
+		    default:
+			Out->RegA = UNKNOWN_REGVAL;
+			break;
+		}
 	    } else {
-		/* A is now unknown */
-		Out->RegA = -1;
+	     	/* A is now unknown */
+	     	Out->RegA = UNKNOWN_REGVAL;
 	    }
 	    break;
 
 	case OP65_LDX:
-	    if (CE_KnownImm (E)) {
-		Out->RegX = (unsigned char) E->Num;
+	    if (CE_IsConstImm (E)) {
+	     	Out->RegX = (unsigned char) E->Num;
+	    } else if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Use & REG_ZP, In)) {
+		    case REG_TMP1:
+			Out->RegX = In->Tmp1;
+			break;
+		    case REG_PTR1_LO:
+			Out->RegX = In->Ptr1Lo;
+			break;
+		    case REG_PTR1_HI:
+			Out->RegX = In->Ptr1Hi;
+			break;
+		    case REG_SREG_LO:
+			Out->RegX = In->SRegLo;
+			break;
+		    case REG_SREG_HI:
+			Out->RegX = In->SRegHi;
+			break;
+		    default:
+			Out->RegX = UNKNOWN_REGVAL;
+			break;
+		}
 	    } else {
-		/* X is now unknown */
-		Out->RegX = -1;
+	     	/* X is now unknown */
+	     	Out->RegX = UNKNOWN_REGVAL;
 	    }
 	    break;
 
 	case OP65_LDY:
-	    if (CE_KnownImm (E)) {
-		Out->RegY = (unsigned char) E->Num;
+	    if (CE_IsConstImm (E)) {
+	     	Out->RegY = (unsigned char) E->Num;
+	    } else if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Use & REG_ZP, In)) {
+		    case REG_TMP1:
+			Out->RegY = In->Tmp1;
+			break;
+		    case REG_PTR1_LO:
+			Out->RegY = In->Ptr1Lo;
+			break;
+		    case REG_PTR1_HI:
+			Out->RegY = In->Ptr1Hi;
+			break;
+		    case REG_SREG_LO:
+			Out->RegY = In->SRegLo;
+			break;
+		    case REG_SREG_HI:
+			Out->RegY = In->SRegHi;
+			break;
+		    default:
+			Out->RegY = UNKNOWN_REGVAL;
+			break;
+		}
 	    } else {
 		/* Y is now unknown */
-		Out->RegY = -1;
+		Out->RegY = UNKNOWN_REGVAL;
 	    }
 	    break;
 
 	case OP65_LSR:
-	    if (E->AM == AM65_ACC && In->RegA >= 0) {
+	    if (E->AM == AM65_ACC && RegValIsKnown (In->RegA)) {
 		Out->RegA = (In->RegA >> 1) & 0xFF;
+	    } else if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+		    case REG_TMP1:
+			Out->Tmp1 = (In->Tmp1 >> 1) & 0xFF;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = (In->Ptr1Lo >> 1) & 0xFF;
+			break;
+		    case REG_PTR1_HI:
+		     	Out->Ptr1Hi = (In->Ptr1Hi >> 1) & 0xFF;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = (In->SRegLo >> 1) & 0xFF;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = (In->SRegHi >> 1) & 0xFF;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
 	    }
 	    break;
 
@@ -540,13 +957,34 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 	    break;
 
 	case OP65_ORA:
-	    if (In->RegA >= 0) {
-		if (CE_KnownImm (E)) {
-		    Out->RegA = In->RegA | (short) E->Num;
-		} else {
-		    /* A is now unknown */
-		    Out->RegA = -1;
-		}
+	    if (RegValIsKnown (In->RegA)) {
+	 	if (CE_IsConstImm (E)) {
+	 	    Out->RegA = In->RegA | (short) E->Num;
+	       	} else if (E->AM == AM65_ZP) {
+	 	    switch (GetKnownReg (E->Use & REG_ZP, In)) {
+	 	    	case REG_TMP1:
+	 	    	    Out->RegA = In->RegA | In->Tmp1;
+	 	    	    break;
+	 		case REG_PTR1_LO:
+	 		    Out->RegA = In->RegA | In->Ptr1Lo;
+	 		    break;
+	 		case REG_PTR1_HI:
+	 		    Out->RegA = In->RegA | In->Ptr1Hi;
+	 		    break;
+	 		case REG_SREG_LO:
+	 		    Out->RegA = In->RegA | In->SRegLo;
+	 		    break;
+	 		case REG_SREG_HI:
+	 		    Out->RegA = In->RegA | In->SRegHi;
+	 		    break;
+	 	    	default:
+	 	    	    Out->RegA = UNKNOWN_REGVAL;
+	 	    	    break;
+	 	    }
+	 	} else {
+	 	    /* A is now unknown */
+	 	    Out->RegA = UNKNOWN_REGVAL;
+	 	}
 	    }
 	    break;
 
@@ -563,55 +1001,194 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 	    break;
 
 	case OP65_PLA:
-	    Out->RegA = -1;
+	    Out->RegA = UNKNOWN_REGVAL;
 	    break;
 
 	case OP65_PLP:
 	    break;
 
-	case OP65_PLX:
-	    Out->RegX = -1;
-	    break;
+    	case OP65_PLX:
+    	    Out->RegX = UNKNOWN_REGVAL;
+    	    break;
 
-	case OP65_PLY:
-	    Out->RegY = -1;
-	    break;
+    	case OP65_PLY:
+    	    Out->RegY = UNKNOWN_REGVAL;
+    	    break;
 
-	case OP65_ROL:
-	    Out->RegA = -1;
-	    break;
+    	case OP65_ROL:
+	    /* We don't know the value of the carry bit */
+    	    if (E->AM == AM65_ACC) {
+    		Out->RegA = UNKNOWN_REGVAL;
+    	    } else if (E->AM == AM65_ZP) {
+	     	switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+		    case REG_TMP1:
+		     	Out->Tmp1 = UNKNOWN_REGVAL;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = UNKNOWN_REGVAL;
+			break;
+		    case REG_PTR1_HI:
+			Out->Ptr1Hi = UNKNOWN_REGVAL;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = UNKNOWN_REGVAL;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = UNKNOWN_REGVAL;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
+    	    }
+    	    break;
 
-	case OP65_ROR:
-	    Out->RegA = -1;
-	    break;
+    	case OP65_ROR:
+	    /* We don't know the value of the carry bit */
+    	    if (E->AM == AM65_ACC) {
+    		Out->RegA = UNKNOWN_REGVAL;
+    	    } else if (E->AM == AM65_ZP) {
+	     	switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+		    case REG_TMP1:
+			Out->Tmp1 = UNKNOWN_REGVAL;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = UNKNOWN_REGVAL;
+			break;
+		    case REG_PTR1_HI:
+			Out->Ptr1Hi = UNKNOWN_REGVAL;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = UNKNOWN_REGVAL;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = UNKNOWN_REGVAL;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
+    	    }
+    	    break;
 
-	case OP65_RTI:
-	    break;
+    	case OP65_RTI:
+    	    break;
 
-	case OP65_RTS:
-	    break;
+    	case OP65_RTS:
+    	    break;
 
-	case OP65_SBC:
-	    /* We don't know the value of the carry bit */
-	    Out->RegA = -1;
-	    break;
+    	case OP65_SBC:
+    	    /* We don't know the value of the carry bit */
+    	    Out->RegA = UNKNOWN_REGVAL;
+    	    break;
 
-	case OP65_SEC:
-	    break;
+    	case OP65_SEC:
+    	    break;
 
-	case OP65_SED:
-	    break;
+    	case OP65_SED:
+    	    break;
 
-	case OP65_SEI:
-	    break;
+    	case OP65_SEI:
+    	    break;
 
-	case OP65_STA:
+    	case OP65_STA:
+	    if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Chg & REG_ZP, 0)) {
+		    case REG_TMP1:
+			Out->Tmp1 = In->RegA;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = In->RegA;
+			break;
+		    case REG_PTR1_HI:
+			Out->Ptr1Hi = In->RegA;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = In->RegA;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = In->RegA;
+		     	break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
+	    }
 	    break;
 
 	case OP65_STX:
+	    if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Chg & REG_ZP, 0)) {
+		    case REG_TMP1:
+			Out->Tmp1 = In->RegX;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = In->RegX;
+			break;
+		    case REG_PTR1_HI:
+			Out->Ptr1Hi = In->RegX;
+	 		break;
+		    case REG_SREG_LO:
+			Out->SRegLo = In->RegX;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = In->RegX;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
+	    }
 	    break;
 
 	case OP65_STY:
+	    if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Chg & REG_ZP, 0)) {
+		    case REG_TMP1:
+			Out->Tmp1 = In->RegY;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = In->RegY;
+			break;
+		    case REG_PTR1_HI:
+			Out->Ptr1Hi = In->RegY;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = In->RegY;
+			break;
+		    case REG_SREG_HI:
+			Out->SRegHi = In->RegY;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
+            }
+	    break;
+
+	case OP65_STZ:
+	    if (E->AM == AM65_ZP) {
+		switch (GetKnownReg (E->Chg & REG_ZP, 0)) {
+		    case REG_TMP1:
+	 		Out->Tmp1 = 0;
+			break;
+		    case REG_PTR1_LO:
+			Out->Ptr1Lo = 0;
+			break;
+		    case REG_PTR1_HI:
+			Out->Ptr1Hi = 0;
+			break;
+		    case REG_SREG_LO:
+			Out->SRegLo = 0;
+			break;
+		    case REG_SREG_HI:
+		    	Out->SRegHi = 0;
+			break;
+		}
+	    } else if (E->AM == AM65_ZPX) {
+                /* Invalidates all ZP registers */
+                RC_InvalidateZP (Out);
+            }
 	    break;
 
 	case OP65_TAX:
@@ -623,17 +1200,97 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 	    break;
 
 	case OP65_TRB:
-	    /* For now... */
-	    Out->RegA = -1;
+	    if (E->AM == AM65_ZPX) {
+	     	/* Invalidates all ZP registers */
+	    	RC_InvalidateZP (Out);
+	    } else if (E->AM == AM65_ZP) {
+	    	if (RegValIsKnown (In->RegA)) {
+		    switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+			case REG_TMP1:
+			    Out->Tmp1 &= ~In->RegA;
+			    break;
+			case REG_PTR1_LO:
+			    Out->Ptr1Lo &= ~In->RegA;
+			    break;
+			case REG_PTR1_HI:
+	 		    Out->Ptr1Hi &= ~In->RegA;
+			    break;
+			case REG_SREG_LO:
+			    Out->SRegLo &= ~In->RegA;
+			    break;
+			case REG_SREG_HI:
+			    Out->SRegHi &= ~In->RegA;
+			    break;
+		    }
+	    	} else {
+		    switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+			case REG_TMP1:
+			    Out->Tmp1 = UNKNOWN_REGVAL;
+			    break;
+			case REG_PTR1_LO:
+			    Out->Ptr1Lo = UNKNOWN_REGVAL;
+			    break;
+			case REG_PTR1_HI:
+			    Out->Ptr1Hi = UNKNOWN_REGVAL;
+			    break;
+			case REG_SREG_LO:
+			    Out->SRegLo = UNKNOWN_REGVAL;
+			    break;
+		     	case REG_SREG_HI:
+			    Out->SRegHi = UNKNOWN_REGVAL;
+			    break;
+		    }
+	    	}
+	    }
 	    break;
 
 	case OP65_TSB:
-	    /* For now... */
-	    Out->RegA = -1;
+	    if (E->AM == AM65_ZPX) {
+	     	/* Invalidates all ZP registers */
+	    	RC_InvalidateZP (Out);
+	    } else if (E->AM == AM65_ZP) {
+	    	if (RegValIsKnown (In->RegA)) {
+		    switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+			case REG_TMP1:
+			    Out->Tmp1 |= In->RegA;
+			    break;
+			case REG_PTR1_LO:
+			    Out->Ptr1Lo |= In->RegA;
+	 		    break;
+			case REG_PTR1_HI:
+			    Out->Ptr1Hi |= In->RegA;
+			    break;
+			case REG_SREG_LO:
+			    Out->SRegLo |= In->RegA;
+			    break;
+			case REG_SREG_HI:
+			    Out->SRegHi |= In->RegA;
+			    break;
+		    }
+	    	} else {
+		    switch (GetKnownReg (E->Chg & REG_ZP, In)) {
+			case REG_TMP1:
+			    Out->Tmp1 = UNKNOWN_REGVAL;
+			    break;
+			case REG_PTR1_LO:
+			    Out->Ptr1Lo = UNKNOWN_REGVAL;
+			    break;
+			case REG_PTR1_HI:
+			    Out->Ptr1Hi = UNKNOWN_REGVAL;
+			    break;
+			case REG_SREG_LO:
+		     	    Out->SRegLo = UNKNOWN_REGVAL;
+			    break;
+			case REG_SREG_HI:
+			    Out->SRegHi = UNKNOWN_REGVAL;
+			    break;
+		    }
+	    	}
+	    }
 	    break;
 
 	case OP65_TSX:
-	    Out->RegX = -1;
+	    Out->RegX = UNKNOWN_REGVAL;
 	    break;
 
 	case OP65_TXA:
@@ -655,6 +1312,56 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 
 
 
+static char* RegInfoDesc (unsigned U, char* Buf)
+/* Return a string containing register info */
+{
+    Buf[0] = '\0';
+
+    strcat (Buf, U & REG_SREG_HI? "H" : "_");
+    strcat (Buf, U & REG_SREG_LO? "L" : "_");
+    strcat (Buf, U & REG_A?       "A" : "_");
+    strcat (Buf, U & REG_X?       "X" : "_");
+    strcat (Buf, U & REG_Y?       "Y" : "_");
+    strcat (Buf, U & REG_TMP1?    "T1" : "__");
+    strcat (Buf, U & REG_PTR1?    "1" : "_");
+    strcat (Buf, U & REG_PTR2?    "2" : "_");
+    strcat (Buf, U & REG_SAVE?    "V"  : "_");
+    strcat (Buf, U & REG_SP?      "S" : "_");
+
+    return Buf;
+}
+
+
+
+static char* RegContentDesc (const RegContents* RC, char* Buf)
+/* Return a string containing register contents */
+{
+    char* B = Buf;
+
+    if (RegValIsUnknown (RC->RegA)) {
+        strcpy (B, "A:XX ");
+    } else {
+        sprintf (B, "A:%02X ", RC->RegA);
+    }
+    B += 5;
+    if (RegValIsUnknown (RC->RegX)) {
+        strcpy (B, "X:XX ");
+    } else {
+        sprintf (B, "X:%02X ", RC->RegX);
+    }
+    B += 5;
+    if (RegValIsUnknown (RC->RegY)) {
+        strcpy (B, "Y:XX");
+    } else {
+        sprintf (B, "Y:%02X", RC->RegY);
+    }
+    B += 4;
+
+    return Buf;
+}
+
+
+
 void CE_Output (const CodeEntry* E, FILE* F)
 /* Output the code entry to a file */
 {
@@ -678,7 +1385,6 @@ void CE_Output (const CodeEntry* E, FILE* F)
     /* Print the operand */
     switch (E->AM) {
 
-	case AM_IMP:
     	case AM65_IMP:
     	    /* implicit */
     	    break;
@@ -688,18 +1394,16 @@ void CE_Output (const CodeEntry* E, FILE* F)
     	    Chars += fprintf (F, "%*sa", 9-Chars, "");
     	    break;
 
-	case AM_IMM:
 	case AM65_IMM:
     	    /* immidiate */
     	    Chars += fprintf (F, "%*s#%s", 9-Chars, "", E->Arg);
     	    break;
 
-	case AM_ABS:
     	case AM65_ZP:
     	case AM65_ABS:
 	    /* zeropage and absolute */
 	    Chars += fprintf (F, "%*s%s", 9-Chars, "", E->Arg);
-	    break;
+       	    break;
 
 	case AM65_ZPX:
 	case AM65_ABSX:
@@ -740,20 +1444,27 @@ void CE_Output (const CodeEntry* E, FILE* F)
 
     /* Print usage info if requested by the debugging flag */
     if (Debug) {
-  	fprintf (F,
-		 "%*s; USE: %c%c%c CHG: %c%c%c SIZE: %u\n",
-		 30-Chars, "",
-		 (E->Use & REG_A)? 'A' : '_',
-		 (E->Use & REG_X)? 'X' : '_',
-		 (E->Use & REG_Y)? 'Y' : '_',
-		 (E->Chg & REG_A)? 'A' : '_',
-		 (E->Chg & REG_X)? 'X' : '_',
-		 (E->Chg & REG_Y)? 'Y' : '_',
-		 E->Size);
-    } else {
-	/* Terminate the line */
-	fprintf (F, "\n");
+	char Use [128];
+	char Chg [128];
+       	fprintf (F,
+       	       	 "%*s; USE: %-12s CHG: %-12s SIZE: %u",
+       	       	 30-Chars, "",
+	    	 RegInfoDesc (E->Use, Use),
+	    	 RegInfoDesc (E->Chg, Chg),
+	       	 E->Size);
+
+        if (E->RI) {
+            char RegIn[32];
+            char RegOut[32];
+            fprintf (F,
+                     "    In %s  Out %s",
+                     RegContentDesc (&E->RI->In, RegIn),
+                     RegContentDesc (&E->RI->Out, RegOut));
+        }
     }
+
+    /* Terminate the line */
+    fprintf (F, "\n");
 }