Code cleanup from last patch, also, version bump for same. :-)
[rmac] / parmode.h
index 543701ace549f4bb9e9ee4c879888a1f6cab2c70..b116427da7cff908d2a3269bdb58651de4ce8677 100644 (file)
--- a/parmode.h
+++ b/parmode.h
@@ -1,7 +1,7 @@
 //
 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
 // PARMODE.C - Addressing Modes Parser Include
-// Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
+// Copyright (C) 199x Landon Dyer, 2017 Reboot and Friends
 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
 // Source utilised with the kind permission of Landon Dyer
 //
 
                AMn = IMMED;
        }
+
+       // Small problem with this is that the opening parentheses might be an
+       // expression that's part of a displacement; this code will falsely flag
+       // that as an error.
+
        // (An)
        // (An)+
        // (An,Xn[.siz][*scale])
                        }
 
                        AMn = AINDEXED;
-                       goto AMn_IX0;                                      // Handle ",Xn[.siz][*scale])"
+                       goto AMn_IX0;            // Handle ",Xn[.siz][*scale])"
+               }
+               else if ((*tok >= KW_D0) && (*tok <= KW_D7))
+               {
+                       //Since index register isn't used here, store register number in this field
+                       AnIXREG = *tok++ & 7;                                // (Dn)
+                       if (*tok == ')')
+                       {
+                               tok++;
+                               AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
+                               AnEXTEN |= EXT_BS;          // Base register suppressed
+                               AnEXTEN |= EXT_BDSIZE0;     // Base displacement null
+                               AnEXTEN |= EXT_IISPOSN;     // Indirect Postindexed with Null Outer Displacement
+                               AMn= MEMPOST;
+                               AnREG = 6 << 3;         // stuff 110 to mode field
+                               goto AnOK;
+                       }
+                       else if (*tok == 'L')
+                       {
+                               // TODO: does DINDL gets used at all?
+                               //AMn=DINDL;                                     // (Dn.l)
+                               //AnEXTEN = 1 << 1;   // Long index size
+                               //tok++;
+                       }
+                       else if (*tok == 'W')                                // (Dn.w)
+                       {
+                               // TODO: does DINDW gets used at all?
+                               //AMn=DINDW;
+                               //AnEXTEN = 1 << 1;   // Word index size
+                               //tok++;
+                       }
+                       else if (*tok == ',')
+                       {
+                               // ([bd,An],Xn..) without bd, An
+                               // Base displacement is suppressed
+                               AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
+                               AnEXTEN |= EXT_BS;          // Base register suppressed
+                               AnEXTEN |= EXT_BDSIZE0;
+                               AnREG = 6 << 3;         // stuff 110 to mode field
+                               tok++;
+                               goto CHECKODn;
+                       }
+                       else
+                               return error("(Dn) error");
+
+                       if (*tok == ')')
+                       {
+                               tok++;
+                               AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
+                               AnEXTEN |= EXT_BS;          // Base register suppressed
+                               AnEXTEN |= EXT_BDSIZE0;     // Base displacement null
+                               AnEXTEN |= EXT_IISPOSN;     // Indirect Postindexed with Null Outer Displacement
+                               AnREG = 6 << 3;         // stuff 110 to mode field
+                               AMn = MEMPOST;
+                               goto AnOK;
+                       }
+                       else
+                               return error("unhandled so far");
                }
                else if (*tok == KW_PC)
-               {                            // (PC,Xn[.siz][*scale]) 
+               {                            // (PC,Xn[.siz][*scale])
                        tok++;
                        AMn = PCINDEXED;
 
-                       // Common index handler; enter here with `tok' pointing at the comma.
+                       // Common index handler; enter here with 'tok' pointing at the
+                       // comma.
 
-                       AMn_IX0:                                           // Handle indexed with missing expr
+                       AMn_IX0:                 // Handle indexed with missing expr
 
                        AnEXVAL = 0;
                        AnEXATTR = ABS | DEFINED;
 
-                       AMn_IXN:                                           // Handle any indexed (tok -> a comma)
+                       AMn_IXN:                 // Handle any indexed (tok -> a comma)
 
                        if (*tok++ != ',')
                                goto badmode;
                        AnIXREG = *tok++ & 15;
 
                        switch ((int)*tok)
-                       {                                // Index reg size: <empty> | .W | .L 
+                       {                        // Index reg size: <empty> | .W | .L
                        case DOTW:
                                tok++;
                        default:
                                AnIXSIZ = 0x0800;
                                tok++;
                                break;
-                       case DOTB:                                      // .B not allowed here...
+                       case DOTB:               // .B not allowed here...
                                goto badmode;
                        }
 
                        if (*tok == '*')
-                       {                                  // scale: *1, *2, *4, *8 
+                       {                        // scale: *1, *2, *4, *8
                                tok++;
 
                                if (*tok++ != CONST || *tok > 8)
                                }
                        }
 
-                       if (*tok++ != ')')                                  // final ")" 
+                       if (*tok++ != ')')         // final ")"
                                goto badmode;
 
                        goto AnOK;
                }
                else if (*tok == '[')
-               {                              // ([... 
-                       goto unmode;
+               {                              // ([...
+                       tok++;
+                       AnEXTEN|=EXT_FULLWORD;     //Definitely using full extension format, so set bit 8
+                       // Check to see if base displacement is present
+                       //WARNING("expr will return a bad expression error here but this is expected, it needs to be silenced!");
+                       if (*tok!=CONST && *tok !=SYMBOL)
+                       //if (expr(AnBEXPR, &AnBEXVAL, &AnBEXATTR, &AnESYM) != OK)
+                       {
+                               AnEXTEN|=EXT_BDSIZE0;
+                               //tok++;
+                               //tok--;                 //Rewind tok since expr advances it forward
+                       }
+                       else
+                       {
+                               expr(AnBEXPR, &AnBEXVAL, &AnBEXATTR, &AnESYM);
+                               if (optim_flags[OPT_BASE_DISP] && AnBEXVAL==0 && AnEXATTR!=0)
+                               {
+                                       // bd=0 so let's optimise it out
+                                       AnEXTEN|=EXT_BDSIZE0;
+                               }
+                               else if (*tok==DOTL)
+                               {                                                  // ([bd.l,...
+                                               AnEXTEN|=EXT_BDSIZEL;
+                                               tok++;
+                               }
+                               else
+                               {                                                  // ([bd[.w],... or ([bd,...
+                                       // Is .W forced here?
+                                       if (*tok == DOTW)
+                                       {
+                                       AnEXTEN|=EXT_BDSIZEW;
+                                               tok++;
+                                       }
+                                       else
+                                       {
+                                               // Defined, absolute values from $FFFF8000..$00007FFF get optimized
+                                               // to absolute short
+                                               if (optim_flags[OPT_ABS_SHORT]
+                                                       && ((AnBEXATTR & (TDB | DEFINED)) == DEFINED)
+                                                       && ((AnBEXVAL + 0x8000) < 0x10000))
+                                               {
+                                                       AnEXTEN |= EXT_BDSIZEW;
+                                                       warn("absolute value in base displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
+                                               }
+                                               else
+                                               {
+                                                       AnEXTEN |= EXT_BDSIZEL;
+                                               }
+                                       }
+                               }
+
+                               if (*tok == ',')
+                                       tok++;
+                               //else
+                               //      return error("Comma expected after base displacement");
+                       }
+
+                       // Check for address register or PC, suppress base register
+                       // otherwise
+
+                       if (*tok == KW_PC)
+                       {                                       // ([bd,PC,...
+                               AnREG = (7 << 3) | 3;   // PC is special case - stuff 011 to register field and 111 to the mode field
+                               tok++;
+                       }
+                       else if ((*tok >= KW_A0) && (*tok <= KW_A7))
+                       {                                       // ([bd,An,...
+                               AnREG = (6<<3)|*tok & 7;
+                               tok++;
+                       }
+                       else if ((*tok >= KW_D0) && (*tok <= KW_D7))
+                       {
+                               // ([bd,Dn,...
+                               AnREG = (6 << 3);
+                               AnEXTEN |= ((*tok & 7) << 12);
+                               AnEXTEN |= EXT_D;
+                               AnEXTEN |= EXT_BS; // Oh look, a data register! Which means that base register is suppressed
+                               tok++;
+
+                               // Check for size
+                               {
+                                       // ([bd,An/PC],Xn.W/L...)
+                                       switch ((int)*tok)
+                                       {
+                                       // Index reg size: <empty> | .W | .L
+                                       case DOTW:
+                                               tok++;
+                                               break;
+                                       default:
+                                               break;
+                                       case DOTL:
+                                               AnEXTEN |= EXT_L;
+                                               tok++;
+                                               break;
+                                       case DOTB:
+                                               // .B not allowed here...
+                                               goto badmode;
+                                       }
+                               }
+
+                               // Check for scale
+                               if (*tok == '*')                        // ([bd,An/PC],Xn*...)
+                               {
+                                       tok++;
+
+                                       if (*tok == CONST)      // TODO: I suppose the scale is stored as a CONST and nothing else? So prolly the if is not needed?
+                                               tok++;
+
+                                       switch ((int)*tok++)
+                                       {
+                                       case 1:
+                                               break;
+                                       case 2:
+                                               AnEXTEN |= EXT_TIMES2;
+                                               break;
+                                       case 4:
+                                               AnEXTEN |= EXT_TIMES4;
+                                               break;
+                                       case 8:
+                                               AnEXTEN |= EXT_TIMES8;
+                                               break;
+                                       default:
+                                               goto badmode;
+                                       }
+                               }
+
+                               if (*tok == ']')  // ([bd,Dn]...
+                               {
+                                       tok++;
+                                       goto IS_SUPPRESSEDn;
+                               }
+                       }
+                       else if (*tok == ']')
+                       {
+                               // PC and Xn is suppressed
+                               AnREG = 6 << 3;         // stuff 110 to mode field
+                               //AnEXTEN|=EXT_BS|EXT_IS;
+                               AnEXTEN |= EXT_BS;
+                       }
+                       else
+                       {
+                               goto badmode;
+                       }
+
+                       // At a crossroads here. We can accept either ([bd,An/PC],... or ([bd,An/PC,Xn*scale],...
+                       if (*tok == ']')
+                       {
+                               //([bd,An/PC],Xn,od)
+                               // Check for Xn
+                               tok++;
+
+                               if (*tok == ')')
+                               {
+                                       //Xn and od are non existent, get out of jail free card
+                                       AMn = MEMPRE;                   // ([bc,An,Xn],od) with no Xn and od
+                                       AnEXTEN |= EXT_IS | EXT_IISPREN;        //Suppress Xn and od
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else if (*tok != ',')
+                                       return error("comma expected after ]");
+                               else
+                                       tok++;                          // eat the comma
+
+                               if ((*tok >= KW_A0) && (*tok <= KW_A7))
+                               {
+                                       AnIXREG = ((*tok & 7) << 12);
+                                       AnEXTEN |= EXT_A;
+                                       tok++;
+                               }
+                               else if ((*tok >= KW_D0) && (*tok <= KW_D7))
+                               {
+                                       AnEXTEN |= ((*tok & 7) << 12);
+                                       AnEXTEN |= EXT_D;
+                                       tok++;
+                               }
+                               else
+                               {
+                                       //No index found, suppress it
+                                       AnEXTEN |= EXT_IS;
+                                       tok--;                                                  // Rewind tok to point to the comma
+                                       goto IS_SUPPRESSEDn;                    // https://xkcd.com/292/ - what does he know anyway?
+                               }
+
+                               // Check for size
+                               {
+                                       // ([bd,An/PC],Xn.W/L...)
+                                       switch ((int)*tok)
+                                       {
+                                       // Index reg size: <empty> | .W | .L
+                                       case DOTW:
+                                               tok++;
+                                               break;
+                                       default:
+                                               break;
+                                       case DOTL:
+                                               AnEXTEN |= EXT_L;
+                                               tok++;
+                                               break;
+                                       case DOTB:
+                                               // .B not allowed here...
+                                               goto badmode;
+                                       }
+                               }
+
+                               // Check for scale
+                               if (*tok == '*')
+                               {
+                                       // ([bd,An/PC],Xn*...)
+                                       tok++;
+
+                                       if (*tok == CONST)      // TODO: I suppose the scale is stored as a CONST and nothing else? So prolly the if is not needed?
+                                               tok++;
+
+                                       switch ((int)*tok++)
+                                       {
+                                       case 1:
+                                               break;
+                                       case 2:
+                                               AnEXTEN |= EXT_TIMES2;
+                                               break;
+                                       case 4:
+                                               AnEXTEN |= EXT_TIMES4;
+                                               break;
+                                       case 8:
+                                               AnEXTEN |= EXT_TIMES8;
+                                               break;
+                                       default:
+                                               goto badmode;
+                                       }
+                               }
+
+                               // Check for od
+                               if (*tok == ')')        // ([bd,An/PC],Xn)
+                               {
+                                       //od is non existant, get out of jail free card
+                                       AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISPOSN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else if (*tok!=',')
+                                       return error("comma expected");
+                               else
+                                       tok++;  // eat the comma
+
+                               CHECKODn:
+
+                               if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+                                       goto badmode;
+
+                               if (optim_flags[OPT_BASE_DISP] && (AnEXVAL == 0))
+                               {
+                                       // od=0 so optimise it out
+                                       AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISPOSN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+
+                               // ([bd,An/PC],Xn,od)
+                               if (*tok == DOTL)
+                               {
+                                       // expr.L
+                                       AnEXTEN |= EXT_IISPOSL; // Long outer displacement
+                                       AMn = MEMPOST;
+
+                                       // Defined, absolute values from $FFFF8000..$00007FFF get
+                                       // optimized to absolute short
+                                       if (optim_flags[OPT_ABS_SHORT]
+                                               && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+                                               && ((AnEXVAL + 0x8000) < 0x10000))
+                                       {
+                                               AnEXTEN |= EXT_IISPOSW; // Word outer displacement
+                                               AMn = MEMPOST;
+                                               warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+                                       }
+
+                               }
+                               else
+                               {
+                                       // expr[.W]
+                                       AnEXTEN |= EXT_IISPOSW; // Word outer displacement
+                                       AMn = MEMPOST;
+
+                                       // Is .W forced here?
+                                       if (*tok == DOTW)
+                                       {
+                                               tok++;
+                                       }
+                               }
+
+                               // Check for final closing parenthesis
+                               if (*tok == ')')
+                               {
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else
+                                       return error("Closing parenthesis missing on addressing mode");
+
+                               IS_SUPPRESSEDn:
+
+                               // Check for od
+                               if (*tok == ')')        // ([bd,An/PC],Xn)
+                               {
+                                       //od is non existant, get out of jail free card
+                                       AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISNOIN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else if (*tok!=',')
+                                       return error("comma expected");
+                               else
+                                       tok++;  // eat the comma
+
+                if ((*tok != CONST) && (*tok != SYMBOL))
+                                       goto badmode;
+
+                               expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM);
+
+                               if (optim_flags[OPT_BASE_DISP] && (AnEXVAL == 0))
+                               {
+                                       // od=0 so optimise it out
+                                       AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISNOIN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+
+                               // ([bd,An/PC],Xn,od)
+                               if (*tok == DOTL)
+                               {
+                                       // expr.L
+                                       tok++;
+                                       AMn = MEMPOST;
+                                       AnEXTEN |= EXT_IISNOIL; // Long outer displacement with IS suppressed
+                               }
+                               else
+                               {
+                                       // expr[.W][]
+                                       AnEXTEN |= EXT_IISNOIW; // Word outer displacement with IS suppressed
+                                       AMn = MEMPRE;
+
+                                       if (*tok == DOTW)
+                                       {
+                                               //AnEXTEN|=EXT_IISNOIW; // Word outer displacement
+                                               AMn = MEMPOST;
+                                               tok++;
+                                       }
+
+                                       // Defined, absolute values from $FFFF8000..$00007FFF get
+                                       // optimized to absolute short
+                                       else if (optim_flags[OPT_BASE_DISP]
+                                               && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+                                               && ((AnEXVAL + 0x8000) < 0x10000))
+                                       {
+                                               //AnEXTEN|=EXT_IISNOIW; // Word outer displacement with IS suppressed
+                                               warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+                                       }
+                               }
+
+                               // Check for final closing parenthesis
+                               if (*tok == ')')
+                               {
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else
+                                       return error("Closing parenthesis missing on addressing mode");
+                       }
+                       else if (*tok == ',')
+                       {
+                               *tok++;                 // ([bd,An,Xn.size*scale],od)
+
+                               //Check for Xn
+                               if ((*tok >= KW_A0) && (*tok <= KW_A7))
+                               {
+                                       AnEXTEN |= ((*tok & 7) << 12);
+                                       AnEXTEN |= EXT_A;
+                                       tok++;
+                               }
+                               else if ((*tok >= KW_D0) && (*tok <= KW_D7))
+                               {
+                                       AnEXTEN |= ((*tok & 7) << 12);
+                                       AnEXTEN |= EXT_D;
+                                       tok++;
+                               }
+
+                               // Check for size
+                               {
+                                       // ([bd,An/PC],Xn.W/L...)
+                                       switch ((int)*tok)
+                                       {
+                                       // Index reg size: <empty> | .W | .L
+                                       case DOTW:
+                                               tok++;
+                                               break;
+                                       default:
+                                               break;
+                                       case DOTL:
+                                               tok++;
+                                               AnEXTEN |= EXT_L;
+                                               break;
+                                       case DOTB:
+                                               // .B not allowed here...
+                                               goto badmode;
+                                       }
+                               }
+
+                               // Check for scale
+                               if (*tok == '*')                        // ([bd,An/PC],Xn*...)
+                               {
+                                       tok++;
+
+                                       if (*tok == CONST)      // TODO: I suppose the scale is stored as a CONST and nothing else? So prolly the if is not needed?
+                                               tok++;
+
+                                       switch ((int)*tok++)
+                                       {
+                                       case 1:
+                                               break;
+                                       case 2:
+                                               AnEXTEN |= EXT_TIMES2;
+                                               break;
+                                       case 4:
+                                               AnEXTEN |= EXT_TIMES4;
+                                               break;
+                                       case 8:
+                                               AnEXTEN |= EXT_TIMES8;
+                                               break;
+                                       default:
+                                               goto badmode;
+                                       }
+                               }
+
+                               //Check for ]
+                               if (*tok != ']')
+                                       return error("Expected closing bracket ]");
+
+                               tok++;                  // Eat the bracket
+
+                               //Check for od
+                               if (*tok == ')')        // ([bd,An/PC,Xn]...
+                               {
+                                       //od is non existant, get out of jail free card
+                                       //AnEXVAL=0;            // zero outer displacement
+                                       AMn = MEMPRE;                   // let's say it's ([bd,An,Xn],od) with od suppressed then
+                                       AnEXTEN |= EXT_IISPREN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else if (*tok++!=',')
+                                       return error("comma expected after ]");
+
+                               WARNING(Put symbol and constant checks here!)
+
+                               if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+                                       goto badmode;
+
+                               if (optim_flags[OPT_BASE_DISP] && (AnEXVAL == 0))
+                               {
+                                       // od=0 so optimise it out
+                                       AMn = MEMPRE;            // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISPRE0; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+
+                               // ([bd,An/PC,Xn],od)
+                               if (*tok == DOTL)
+                               {
+                                       // expr.L
+                                       AMn = MEMPRE;
+                                       tok++;
+                                       AnEXTEN |= EXT_IISPREL;
+                               }
+                               else
+                               {
+                                       // expr.[W]
+                                       //tok++;
+
+                                       AnEXTEN |= EXT_IISPREW;
+                                       AMn = MEMPRE;
+
+                    // Is .W forced here?
+                                       if (*tok == DOTW)
+                                       {
+                                               tok++;
+                                       }
+
+                                       // Defined, absolute values from $FFFF8000..$00007FFF get optimized
+                                       // to absolute short
+                                       else if (optim_flags[OPT_BASE_DISP]
+                                               && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+                                               && ((AnEXVAL + 0x8000) < 0x10000))
+                                       {
+                                               AnEXTEN |= EXT_IISPREW;
+                                               warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+                                       }
+                               }
+
+                               // Check for final closing parenthesis
+                               if (*tok == ')')
+                               {
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else
+                                       return error("Closing parenthesis missing on addressing mode");
+                       }
+                       else
+                               goto badmode;
                }
                else
-               {                                              // (expr... 
+               {
+                       // (expr...
                        if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
                                return ERROR;
 
+                       // It could be that this is really just an expression prefixing a
+                       // register as a displacement...
+                       if (*tok == ')')
+                       {
+                               tok++;
+                               goto CHK_FOR_DISPn;
+                       }
+
+                       // Otherwise, check for PC & etc displacements...
                        if (*tok++ != ',')
                                goto badmode;
 
                                }
                                else if (*tok == ')')
                                {
-                                       AMn = PCDISP;                                // expr(PC) 
+                                       AMn = PCDISP;                                // expr(PC)
                                        tok++;
                                        goto AnOK;
                                }
                                goto badmode;
                }
        }
-       else if (*tok=='-' && tok[1]=='(' && ((tok[2]>=KW_A0) && (tok[2]<=KW_A7)) && tok[3]==')')
+       else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
        {
                AMn = APREDEC;
                AnREG = tok[2] & 7;
        {
                AMn = AM_USP;
                tok++;
+               AnREG = 2;      //Added this for the case of USP used in movec (see CREGlut in mach.c). Hopefully nothing gets broken!
+               goto AnOK;
+       }
+       else if ((*tok >= KW_IC40) && (*tok <= KW_BC40))
+       {
+               AMn = CACHES;
+               AnREG = *tok++ - KW_IC40;
+
+               // After a cache keyword only a comma or EOL is allowed
+               if ((*tok != ',') && (*tok != EOL))
+                       return ERROR;
+
                goto AnOK;
        }
+       else if ((*tok >= KW_SFC) && (*tok <= KW_CRP))
+       {
+               AMn = CREG;
+               AnREG = (*tok++) - KW_SFC;
+               goto AnOK;
+       }
+       else if ((*tok >= KW_FP0) && (*tok <= KW_FP7))
+       {
+               AMn = FREG;
+               AnREG = (*tok++ & 7);
+       }
+       else if ((*tok >= KW_FPIAR) && (*tok <= KW_FPCR))
+       {
+               AMn = FPSCR;
+               AnREG = (1 << ((*tok++) - KW_FPIAR + 10));
+       }
        // expr
        // expr.w
        // expr.l
                if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
                        return ERROR;
 
+CHK_FOR_DISPn:
                if (*tok == DOTW)
                {
-                       // expr.W 
+                       // expr.W
                        tok++;
                        AMn = ABSW;
+
+                       if (((AnEXATTR & (TDB | DEFINED)) == DEFINED) && (AnEXVAL < 0x10000))
+                               AnEXVAL = (int32_t)(int16_t)AnEXVAL;  // Sign extend value
+
                        goto AnOK;
                }
                else if (*tok != '(')
 
                        // Defined, absolute values from $FFFF8000..$00007FFF get optimized
                        // to absolute short
-                       if ((AnEXATTR & (TDB|DEFINED)) == DEFINED && (AnEXVAL + 0x8000) < 0x10000)
+                       if (optim_flags[OPT_ABS_SHORT]
+                               && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+                               && ((AnEXVAL + 0x8000) < 0x10000))
+                       {
                                AMn = ABSW;
 
+                               if (sbra_flag)
+                                       warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+                       }
+
                        // Is .L forced here?
                        if (*tok == DOTL)
                        {
        }
 
        // Addressing mode OK
-
-       AnOK:
+AnOK:
        ;
 }
 
-// Cleanup dirty little macros
+// Clean up dirty little macros
 #undef AnOK
 #undef AMn
 #undef AnREG
 #undef AnESYM
 #undef AMn_IX0
 #undef AMn_IXN
+#undef CHK_FOR_DISPn
+#undef AnBEXPR
+#undef AnBEXVAL
+#undef AnBEXATTR
+#undef AnBZISE
+#undef AnEXTEN
+#undef AMn_030
+#undef IS_SUPPRESSEDn
+#undef CHECKODn