93 lines
2.1 KiB
NASM
93 lines
2.1 KiB
NASM
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keep obj/int64
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mcopy int64.macros
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case on
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****************************************************************
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*
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* Int64 - 64-bit integer math routines.
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*
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* This code implements routines called by ORCA/C generated
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* code for operations on 64-bit integers.
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*
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****************************************************************
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*
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Int64 start dummy segment
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end
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****************************************************************
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*
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* ~UMUL8 - Eight Byte Unsigned Integer Multiply
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*
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* Inputs:
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* NUM1,NUM2 - operands
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*
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* Outputs:
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* NUM2 - result
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*
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****************************************************************
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*
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~UMUL8 START
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ANS EQU 3
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RETURN EQU ANS+16
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NUM1 EQU RETURN+3
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NUM2 EQU NUM1+8
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LDA #0 set up initial working value
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PHA
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PHA
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PHA
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PHA
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LDA 18,s initially, ANS = NUM1
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PHA
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LDA 18,s
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PHA
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LDA 18,s
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PHA
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LDA 18,s
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PHA
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PHD
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TSC
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TCD
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;
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; Do a 64 bit by 64 bit multiply.
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;
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LDY #64 64 bit multiply
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ML1 LDA ANS
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LSR A
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BCC ML2
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CLC add multiplicand to the partial product
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LDA ANS+8
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ADC NUM2
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STA ANS+8
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LDA ANS+10
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ADC NUM2+2
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STA ANS+10
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LDA ANS+12
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ADC NUM2+4
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STA ANS+12
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LDA ANS+14
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ADC NUM2+6
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STA ANS+14
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ML2 ROR ANS+14 shift the interim result
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ROR ANS+12
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ROR ANS+10
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ROR ANS+8
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ROR ANS+6
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ROR ANS+4
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ROR ANS+2
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ROR ANS
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DEY loop until done
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BNE ML1
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move4 ANS,NUM2 move return value and address
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move4 ANS+4,NUM2+4
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move4 RETURN-1,NUM1+4
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PLD fix stack, DP
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TSC
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CLC
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ADC #24
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TCS
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RTL
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END
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