274 lines
9.4 KiB
OpenEdge ABL
274 lines
9.4 KiB
OpenEdge ABL
; do *NOT* use register4 to register7 during time slicing
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intSrcA EQU register0
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intSrcB EQU register1
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intSrcX EQU register2
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intSwap EQU register3
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intSrcAddr EQU register8
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intDigit EQU register9
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intResult EQU register10
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intNegative EQU register11
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bcdLength EQU register8
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bcdSrcAddr EQU register9
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bcdDstAddr EQU register10
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bcdSrcData EQU register11
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bcdDstData EQU register11 ; alias to make code less confusing
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bcdCarry EQU register12
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bcdBorrow EQU register12 ; alias to make code less confusing
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bcdValue EQU register0
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bcdDigit EQU register1
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bcdMult EQU register2
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%SUB integerMin
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integerMin STW intSrcB
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LDW intSrcA
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SUBW intSrcB
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BLE integerMi_A
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LDW intSrcB
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RET
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integerMi_A LDW intSrcA
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RET
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%ENDS
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%SUB integerMax
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integerMax STW intSrcB
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LDW intSrcA
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SUBW intSrcB
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BGE integerMa_A
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LDW intSrcB
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RET
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integerMa_A LDW intSrcA
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RET
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%ENDS
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%SUB integerClamp
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integerClamp STW intSrcB
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LDW intSrcX
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SUBW intSrcA
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BGE integerCl_X
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BRA integerCl_A0
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integerCl_X LDW intSrcX
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STW intSrcA
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integerCl_A0 LDW intSrcA
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SUBW intSrcB
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BLE integerCl_A1
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LDW intSrcB
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RET
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integerCl_A1 LDW intSrcA
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RET
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%ENDS
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%SUB integerStr
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; converts a string to a +/- integer, assumes string pointer is pointing to first char and not the string length, (no overflow or underflow checks)
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integerStr LDI 0
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ST intNegative
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STW intResult
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LDW intSrcAddr
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PEEK
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SUBI 45 ; -ve
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BNE integerS_loop
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LDI 1
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ST intNegative
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INC intSrcAddr ; skip -ve
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integerS_loop LDW intSrcAddr
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PEEK
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SUBI 48 ; str[i] - '0'
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BLT integerS_neg
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STW intDigit
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SUBI 9
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BGT integerS_neg
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LDW intResult
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LSLW
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LSLW
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ADDW intResult
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LSLW
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ADDW intDigit
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STW intResult ; result = result*10 + digit
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INC intSrcAddr
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BRA integerS_loop
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integerS_neg LD intNegative
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BEQ integerS_exit
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LDI 0
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SUBW intResult ; result *= -1
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RET
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integerS_exit LDW intResult
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RET
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%ENDS
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; bcd values are stored unpacked lsd to msd
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%SUB bcdAdd
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bcdAdd ST bcdLength
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LDI 0
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STW bcdCarry
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bcdA_loop LDW bcdDstAddr
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PEEK ; expects unpacked byte values 0 to 9
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STW bcdDstData
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LDW bcdSrcAddr
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PEEK ; expects unpacked byte values 0 to 9
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ADDW bcdDstData
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ADDW bcdCarry
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STW bcdDstData
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SUBI 10 ; no handling of values > 9
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BLT bcdA_nc
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STW bcdDstData
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LDI 1
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BRA bcdA_cont
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bcdA_nc LDI 0
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bcdA_cont STW bcdCarry
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LDW bcdDstData
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POKE bcdDstAddr ; modifies dst bcd value
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INC bcdDstAddr
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INC bcdSrcAddr
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LD bcdLength
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SUBI 1
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ST bcdLength ; expects src and dst lengths to be equal
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BGT bcdA_loop
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RET
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%ENDS
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; bcd values are stored unpacked lsd to msd
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%SUB bcdSub
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bcdSub ST bcdLength
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LDI 0
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STW bcdBorrow
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bcdS_loop LDW bcdSrcAddr
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PEEK ; expects unpacked byte values 0 to 9
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STW bcdSrcData
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LDW bcdDstAddr
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PEEK ; expects unpacked byte values 0 to 9
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SUBW bcdSrcData
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SUBW bcdBorrow
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STW bcdDstData
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BGE bcdS_nb
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ADDI 10
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STW bcdDstData
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LDI 1
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BRA bcdS_cont
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bcdS_nb LDI 0
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bcdS_cont STW bcdBorrow
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LDW bcdDstData
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POKE bcdDstAddr ; modifies dst bcd value
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INC bcdDstAddr
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INC bcdSrcAddr
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LD bcdLength
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SUBI 1
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ST bcdLength ; expects src and dst lengths to be equal
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BGT bcdS_loop
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RET
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%ENDS
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%SUB bcdDigits
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bcdDigits STW bcdMult
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LDW bcdValue
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bcdD_index SUBW bcdMult
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BLT bcdD_cont
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STW bcdValue
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INC bcdDigit ; calculate digit
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BRA bcdD_index
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bcdD_cont LD bcdDigit
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POKE bcdDstAddr ; store digit
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LDW bcdDstAddr
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SUBI 1
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STW bcdDstAddr
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LDI 0
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ST bcdDigit ; reset digit
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bcdD_exit RET
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%ENDS
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%SUB bcdInt
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; create a bcd value from a +ve int, (max 42767)
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bcdInt STW bcdValue
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PUSH
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LDW bcdDstAddr
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ADDI 4
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STW bcdDstAddr ; bcdDstAddr must point to >= 5 digit bcd value
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LDI 0
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STW bcdDigit
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LDWI 10000
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CALLI bcdDigits
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LDWI 1000
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CALLI bcdDigits
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LDI 100
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CALLI bcdDigits
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LDI 10
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CALLI bcdDigits
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LD bcdValue
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POKE bcdDstAddr
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POP
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RET
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%ENDS
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; bcd values are stored unpacked lsd to msd
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; cmp expects addrs to be pointing to msd!
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%SUB bcdCmp
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bcdCmp ST bcdLength
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bcdCmp_loop LDW bcdDstAddr
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PEEK ; expects unpacked byte values 0 to 9
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STW bcdDstData
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LDW bcdSrcAddr
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PEEK ; expects unpacked byte values 0 to 9
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SUBW bcdDstData
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BGT bcdC_gt
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BLT bcdC_lt
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PUSH
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CALLI bcdCmpExt
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POP
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BGT bcdCmp_loop
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LDI 0
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RET
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bcdC_gt LDI 1
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RET
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bcdC_lt LDWI -1
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RET
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%ENDS
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%SUB bcdCmpExt
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bcdCmpExt LDW bcdDstAddr
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SUBI 1
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STW bcdDstAddr
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LDW bcdSrcAddr
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SUBI 1
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STW bcdSrcAddr
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LD bcdLength
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SUBI 1
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ST bcdLength ; expects src and dst lengths to be equal
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RET
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%ENDS
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%SUB bcdCpy
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bcdCpy ST bcdLength
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bcdCpy_loop LDW bcdSrcAddr
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PEEK
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POKE bcdDstAddr
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INC bcdSrcAddr
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INC bcdDstAddr
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LD bcdLength
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SUBI 1
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ST bcdLength ; expects src and dst lengths to be equal
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BGT bcdCpy_loop
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RET
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%ENDS
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