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1.1.1.2 ! root 1: ;FPRIMS32.S - rsalib assembler primitives for MC680x0 ! 2: ; (Pure-C/Atari ST version, 32-bit units) ! 3: ; ! 4: ;Written by Stephan Baucke 19-Oct-91 ! 5: ;Assembler: Pure-PASM ! 6: ; ! 7: ;On systems with 68020 or higher it might be faster to use 32-Bit units ! 8: ;instead of 16 Bits (I didn't yet test this, but there is no improvement ! 9: ;on a plain 68000). ! 10: ; ! 11: ;Note that the function P_SETP of the Intel primitives is not needed here. ! 12: ;`set_precision' has to be defined just like in `PORTABLE' mode in rsalib.h ! 13: ! 14: IMPORT global_precision ! 15: EXPORT P_ADDC, P_SUBB, P_ROTL, P_SETP, P_SMUL ! 16: ! 17: TEXT ! 18: ! 19: ;boolean P_ADDC(unitptr r1, unitptr r2, boolean carry); ! 20: ; /* multiprecision add with carry r2 to r1, result in r1 */ ! 21: ;Parameters: A0.l: r1, A1.l: r2, D0.b: carry ! 22: ;Result: D0.b: new carry ! 23: ;Modifies: D0-D2/A0-A1 ! 24: ! 25: P_ADDC: move.b d0,d1 ;boolean carry ! 26: sne d1 ;set bit 0 to carry ! 27: move.w global_precision,d2 ;# of units ! 28: move.w d2,d0 ;make copy ! 29: lsl.w #2,d2 ;calc # of bytes (4 per unit) ! 30: add.w d2,a0 ;point r1 to least significant unit ! 31: add.w d2,a1 ;point r2 to least significant unit ! 32: lsr.w #1,d2 ;divide back (now 2 * units) ! 33: and.w #2*7,d2 ;yields 2 * (units % 8) ! 34: neg.w d2 ;negative offset (for 2-Byte instructions) ! 35: lsr.w #3,d0 ;units / 8 ! 36: beq.s .onebyone ;skip loop if zero count ! 37: ! 38: subq.w #1,d0 ;one off (dbf counter) ! 39: lsr.b d1 ;set X if carry ! 40: .loop: REPT 8 ;8 units per run ! 41: addx.l -(a1),-(a0) ! 42: ENDM ! 43: dbf d0,.loop ! 44: jmp .base(pc,d2.w) ;do remaining units ! 45: ! 46: .onebyone: lsr.b d1 ;set X if carry ! 47: jmp .base(pc,d2.w) ;do remaining units ! 48: ! 49: REPT 7 ;max 7 units remaining ! 50: addx.l -(a1),-(a0) ;(2-byte instruction) ! 51: ENDM ! 52: .base: scs d0 ;set returned carry ! 53: rts ! 54: ! 55: ;boolean P_SUBB(unitptr r1, unitptr r2, boolean borrow); ! 56: ; /* multiprecision subtract with borrow, r2 from r1, result in r1 */ ! 57: ;Parameters: A0.l: r1, A1.l: r2, D0.b: borrow ! 58: ;Result: D0.b: new borrow ! 59: ;Modifies: D0-D2/A0/A1 ! 60: ! 61: P_SUBB: move.b d0,d1 ;boolean carry ! 62: sne d1 ;set bit 0 to carry ! 63: move.w global_precision,d2 ;# of units ! 64: move.w d2,d0 ;make copy ! 65: lsl.w #2,d2 ;calc # of bytes (4 per unit) ! 66: add.w d2,a0 ;point r1 to least significant unit ! 67: add.w d2,a1 ;point r2 to least significant unit ! 68: lsr.w #1,d2 ;divide back (now 2 * units) ! 69: and.w #2*7,d2 ;yields 2 * (units % 8) ! 70: neg.w d2 ;negative offset (for 2-byte instructions) ! 71: lsr.w #3,d0 ;units / 8 ! 72: beq.s .onebyone ;skip loop if zero count ! 73: ! 74: subq.w #1,d0 ;one off (dbf counter) ! 75: lsr.b d1 ;set X if carry ! 76: .loop: REPT 8 ;8 units per run ! 77: subx.l -(a1),-(a0) ! 78: ENDM ! 79: dbf d0,.loop ! 80: jmp .base(pc,d2.w) ;do remaining units ! 81: ! 82: .onebyone: lsr.b d1 ;set X if carry ! 83: jmp .base(pc,d2.w) ;do remaining units ! 84: ! 85: REPT 7 ;max 7 units remaining ! 86: subx.l -(a1),-(a0) ;(2-byte instruction) ! 87: ENDM ! 88: .base: scs d0 ;set returned carry ! 89: rts ! 90: ! 91: ;boolean P_ROTL(unitptr r1, boolean carry); ! 92: ; /* multiprecision rotate left 1 bit with carry, result in r1. */ ! 93: ;Parameters: A0.l: r1, D0.b: carry ! 94: ;Result: D0.b: new carry ! 95: ;Modifies: D0-D2/A0 ! 96: ! 97: P_ROTL: move.b d0,d1 ;boolean carry ! 98: sne d1 ;set bit 0 to carry ! 99: move.w global_precision,d2 ;# of units ! 100: move.w d2,d0 ;make copy ! 101: lsl.w #2,d2 ;calc # of bytes (4 per unit) ! 102: add.w d2,a0 ;point r1 to least significant unit ! 103: and.w #4*7,d2 ;yields 4 * (units % 8) ! 104: neg.w d2 ;negative offset (for 4-byte instructions) ! 105: lsr.w #3,d0 ;units / 8 ! 106: beq.s .onebyone ;skip loop if zero count ! 107: ! 108: subq.w #1,d0 ;one off (dbf counter) ! 109: lsr.b d1 ;set X if carry ! 110: .loop: REPT 8 ;8 units per run ! 111: roxl.w -(a0) ;(roxl.l <ea> is not allowed on the 68000) ! 112: roxl.w -(a0) ! 113: ENDM ! 114: dbf d0,.loop ! 115: jmp .base(pc,d2.w) ;do remaining units ! 116: ! 117: .onebyone: lsr.b d1 ;set X if carry ! 118: jmp .base(pc,d2.w) ;do remaining units ! 119: ! 120: REPT 7 ;max 7 units remaining ! 121: roxl.w -(a0) ;(4 bytes instructions per unit) ! 122: roxl.w -(a0) ! 123: ENDM ! 124: .base: scs d0 ;set returned carry ! 125: rts ! 126: ! 127: ! 128: ;void P_SETP(short nbits); ! 129: ; /* sets working precision to specified number of bits. */ ! 130: ; /* only to minimize portation differences */ ! 131: ;Parameters: -- ! 132: ;Result: -- ! 133: ! 134: P_SETP: rts ! 135: ! 136: ; ***NOT TESTED*** ! 137: ; ! 138: ;void P_SMUL(MULTUNIT *prod, MULTUNIT *multiplicand, MULTUNIT multiplier) ! 139: ; /* multiprecision multiply */ ! 140: ;Parameters: A0.l: prod, A1.l: multiplicand, D0.w: multiplier ! 141: ;Modifies: D0-D3/A0-A1 ! 142: ;Result: -- ! 143: ! 144: P_SMUL: move.w global_precision,d3 ! 145: lsl.w #1,d3 ! 146: subq.w #1,d3 ! 147: clr.l d2 ! 148: clr.l d1 ! 149: ! 150: .loop: move.w -(a1),d1 ! 151: mulu.l d0,d1 ! 152: add.l d2,d1 ! 153: add.w d1,-(a0) ! 154: scs d2 ! 155: lsr.l #16,d1 ! 156: add.w d1,d2 ! 157: dbf d3,.loop ! 158: ! 159: move.w d2,(a0) ! 160: rts ! 161: ! 162: ! 163: END ! 164:
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