60 lines
1.3 KiB
ArmAsm
Executable file
60 lines
1.3 KiB
ArmAsm
Executable file
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;; Can use A as b_low!
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;; And X or Y is b_hi
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;; Can add ", !" to the end for it to run faster but C=0 is not garantied!
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.macro Add_16 a_low, a_hi, b_low, b_hi, fast_unsafe ; a = a + b
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;; IF to run it fast
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.ifblank fast_unsafe
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CLC
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.endif
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;; If b_low != A
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.if .match(.mid (0, 1, {b_low}), A )
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.else
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LDA b_low
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.endif
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LDA b_low
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ADC a_low
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STA a_low
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LDA b_hi
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LDA b_hi
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ADC a_hi
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STA a_hi
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.endmacro
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.macro Sub_16 a_low, a_hi, b_low, b_hi, fast_unsafe ; a = a - b
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.ifblank fast_unsafe
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SEC
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.endif
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LDA a_low
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SBC b_low
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STA a_low
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LDA a_hi
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SBC b_hi
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STA a_hi
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.endmacro
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.macro mult_16 low_, hi_, fast_unsafe ; [low, hi] = [low, hi]*2
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;; IF to run it fast
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.ifblank fast_unsafe
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CLC
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.endif
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ROL low_
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ROL hi_
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.endmacro
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;;Se below for some fast 16bit logic
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;;http://6502.org/tutorials/compare_beyond.html
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;; exampel 4.1.1
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;;Larger then operation. IF a < b then jump to label
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.macro Lag_16 a_low, a_hi, b_low, b_hi, label ; [low, hi] = [low, hi]*2
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LDA a_hi ; compare high bytes
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CMP b_hi
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BCC label ; if NUM1H < NUM2H then NUM1 < NUM2
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BNE LABEL ; if NUM1H <> NUM2H then NUM1 > NUM2 (so NUM1 >= NUM2)
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LDA a_low ; compare low bytes
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CMP b_low
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BCC label ; if NUM1L < NUM2L then NUM1 < NUM2
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LABEL:
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.endmacro
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