; MCS macro file for Microsoft/Borland compilers
;
; Triple register is cl|DDI|DBP
; MUL_START. Initialise registers. Make PBX and PSI point to multipliers a 
; and b. PDI points at result c. Note PDI is shared.
; Initialise Triple register to 0
; See makemcs.txt for more information about this file.
; 

MACRO PMUL_START
  ASM {
  push PBP
  push DDI
  push DSI
  mov PBX,a
  mov DSI,b
  mov PDI,c
  xor DCX,DCX
  mov DBP,sn
ENDM

MACRO PMUL
  mov DAX,DBP
  mul POINTER [PBX+N*%d]
  add DAX,DCX
  adc DDX,0
  mov DCX,DDX
  mov POINTER [PSI+N*%d],0
  mov [PDI+N*%d],DAX
ENDM

MACRO PMUL_END
  mov DAX,DBP
  mul DCX
  mov [PSI],DAX
  mov [PSI+N],DDX
  pop DSI
  pop DDI
  pop PBP
  }
ENDM

MACRO MUL_START
  ASM {
  push PBP
  push DDI
  push DSI
  mov PBX,a
  mov PSI,b
  mov PDI,c
  push PDI
  xor DCX,DCX
  xor DDI,DDI
  xor DBP,DBP
ENDM
;
; STEP macro. Calculates a double-register partial product
; and adds it to the triple register total
; Parameters 1 & 2: Indices i and j for partial product multipliers a[i] 
; and b[j]
MACRO STEP
  mov DAX,[PBX+N*%d]
  mul POINTER [PSI+N*%d]
  add DBP,DAX  
  adc DDI,DDX
  adc cl,ch
ENDM
;
; MFIN macro. Finish column calculation. Store Sum for this column
; and get Carry for next
; Parameter 1: Index k for Column Sum c[k]
MACRO MFIN
  mov DDX,DDI
  pop PDI
  mov [PDI+N*%d],DBP
  push PDI
  mov DBP,DDX
  mov DDI,DCX
  xor cl,cl
ENDM
;
; MUL_END
; Parameter 1: Index for final carry c[.]
MACRO MUL_END  
  pop PDI
  mov [PDI+N*%d],DBP
  pop DSI
  pop DDI
  pop PBP
  }
ENDM
;
; LAST
;
MACRO LAST
  mov DAX,[PBX+N*%d]
  mul POINTER [PSI+N*%d]
  add DBP,DAX  
ENDM
;
; SQR_START
; 
MACRO SQR_START
  ASM {
  push PBP
  push DDI
  push DSI
  mov PBX,a
  mov PSI,c
  xor DCX,DCX
  xor DDI,DDI
  xor DBP,DBP
ENDM
;
; DSTEP macro. Calculates a double-register partial product
; and add it twice to a triple register total
; Parameters 1 & 2 : Indices of partial product multipliers
MACRO DSTEP
  mov DAX,[PBX+N*%d]
  mul POINTER [PBX+N*%d]
  add DBP,DAX
  adc DDI,DDX
  adc cl,ch
  add DBP,DAX
  adc DDI,DDX
  adc cl,ch
ENDM
;
; SELF macro. Calculate the double-register square and
; add it to a triple register total
; Parameter 1 : Index of diagonal element
MACRO SELF
  mov DAX,[PBX+N*%d]
  mul DAX
  add DBP,DAX
  adc DDI,DDX
  adc cl,ch
ENDM
;
; SFIN macro. Finish column calculation for squaring. Store Sum
; and get Carry for next column.
; Parameter 1: Index of Column Sum
MACRO SFIN
  mov [PSI+N*%d],DBP
  mov DBP,DDI
  mov DDI,DCX
  xor cl,cl
ENDM
;
; SQR_END
; Parameter 1: Index for final carry
MACRO SQR_END
  mov [PSI+N*%d],DBP
  pop DSI
  pop DDI
  pop PBP
  }
ENDM
;
; REDC_START macro
; 
MACRO REDC_START
  ASM {
  push PBP
  push DDI
  push DSI
  mov PBX,a
  mov PSI,b
  mov DDX,ndash
  push DDX
  xor DDI,DDI
  xor DCX,DCX
  mov DBP,[PBX]
ENDM
;
; RFINU macro
;
MACRO RFINU
  mov DAX,DBP
  pop DDX
  push DDX
  mul DDX
  mov [PBX+N*%d],DAX
  mul POINTER [PSI]
  add DBP,DAX
  adc DDI,DDX
  adc cl,ch
  mov DBP,DDI
  mov DDI,DCX
  xor DCX,DCX
  add DBP,[PBX+N*(%d+1)]
  adc DDI,DCX
ENDM
; 
; RFIND macro
;
MACRO RFIND
  mov [PBX+N*%d],DBP
  mov DBP,DDI
  mov DDI,DCX
  xor DCX,DCX
  add DBP,[PBX+N*(%d+1)]
  adc DDI,DCX
ENDM
;
; REDC_END
;
MACRO REDC_END
  mov [PBX+N*%d],DBP
  mov [PBX+N*(%d+1)],DDI
  pop DDX
  pop DSI
  pop DDI
  pop PBP
  }
ENDM
;
; ADD_START macro - initialise for add/subtract. Do the first one.
;
MACRO ADD_START
  ASM {
  push PSI
  push PDI
  mov PSI,a
  mov PBX,b
  mov PDI,c
  mov DAX,[PSI]
  add DAX,[PBX]
  mov [PDI],DAX
ENDM
;
; ADD macro. Add two numbers from memory and store result in memory.
; Don't forget carry bit
;
MACRO ADD
  mov DAX,[PSI+N*%d]
  adc DAX,[PBX+N*%d]
  mov [PDI+N*%d],DAX
ENDM
;
; ADD_END macro. Catch Carry
;
MACRO ADD_END
  mov DAX,0
  adc DAX,DAX
  mov carry,DAX
  pop PDI
  pop PSI
  }
ENDM
;
; DOUBLE_START macro
;
MACRO DOUBLE_START
  ASM {
  mov PBX,a
  mov DAX,[PBX]
  add [PBX],DAX
ENDM
;
; DOUBLE macro
;
MACRO DOUBLE
  mov DAX,[PBX+N*%d]
  adc [PBX+N*%d],DAX
ENDM
;
; DOUBLE_END
;
MACRO DOUBLE_END
  mov DAX,0
  adc DAX,DAX
  mov carry,DAX
  }
ENDM
;
; INC_START macro - initialise for increment/decrement. Do first one.
; add b[0] to a[0]
MACRO INC_START
  ASM {
  push PDI
  mov PBX,b
  mov PDI,a
  mov DAX,[PBX]
  add [PDI],DAX
ENDM
;
; INC macro. Increment number in memory. Don't forget carry
;
MACRO INC
  mov DAX,[PBX+N*%d]
  adc [PDI+N*%d],DAX
ENDM
;
; INC_END macro. Catch Carry
;
MACRO INC_END
  mov DAX,0
  adc DAX,DAX
  mov carry,DAX
  pop PDI
  }
ENDM
;
; SUB_START macro. Do first one
;
MACRO SUB_START
  ASM {
  push PSI
  push PDI
  mov PSI,a
  mov PBX,b
  mov PDI,c
  mov DAX,[PSI]
  sub DAX,[PBX]
  mov [PDI],DAX
ENDM
;
; SUB macro. Subtract two numbers in memory and store result in memory.
;
MACRO SUB
  mov DAX,[PSI+N*%d]
  sbb DAX,[PBX+N*%d]
  mov [PDI+N*%d],DAX
ENDM
;
; SUB_END macro
;
MACRO SUB_END
  mov DAX,0
  adc DAX,DAX
  mov carry,DAX
  pop PDI
  pop PSI
  }
ENDM
;
; DEC_START macro
;
MACRO DEC_START
  ASM {
  push PDI
  mov PBX,b
  mov PDI,a
  mov DAX,[PBX]
  sub [PDI],DAX
ENDM
;
; DEC macro. Decrement from number in memory. Don't forget borrow.
;
MACRO DEC
  mov DAX,[PBX+N*%d]
  sbb [PDI+N*%d],DAX
ENDM
;
; DEC_END macro. Catch carry
;
MACRO DEC_END
  mov DAX,0
  adc DAX,DAX
  mov carry,DAX
  pop PDI
  }
ENDM
;
; KADD_START macro. Zero carry flag.
;
MACRO KADD_START
  ASM {
  push PSI
  push PDI
  mov PSI,a
  mov PBX,b
  mov PDI,c
  mov PCX,n
  xor DAX,DAX
  k%d:
ENDM
;
; KASL macro. Important that carry flag is undisturbed
;
MACRO KASL
  dec PCX
  je k%d
  lea PSI,[PSI+N*%d]
  lea PBX,[PBX+N*%d]
  lea PDI,[PDI+N*%d]
  jmp k%d
  k%d:
ENDM
;
; KADD_END  macro
;
MACRO KADD_END
  mov DAX,0
  adc DAX,DAX
  mov carry,DAX
  pop PDI
  pop PSI
  }
ENDM
;
; KINC_START macro. Zero Carry Flag 
;
MACRO KINC_START
  ASM {
  push PDI
  mov PDI,a
  mov PBX,b
  mov PCX,n
  xor DAX,DAX
  k%d:
ENDM
;
; KIDL macro. Important that carry flag is undisturbed!
;
MACRO KIDL
  dec PCX
  je k%d
  lea PBX,[PBX+N*%d]
  lea PDI,[PDI+N*%d]
  jmp k%d
  k%d:
ENDM
;
; KINC_END macro
;
MACRO KINC_END
  mov DAX,0
  adc DAX,DAX
  mov carry,DAX
  pop PDI
  }
ENDM
;
; KDEC_START macro. Zero Carry flag
;
MACRO KDEC_START
  ASM {
  push PDI
  mov PDI,a
  mov PBX,b
  mov PCX,n
  xor DAX,DAX
  k%d:
ENDM
;
; KDEC_END macro
;
MACRO KDEC_END
  mov DAX,0
  adc DAX,DAX
  mov carry,DAX
  pop PDI
  }
ENDM