4f396fd740
I needed to use 16bit logic to ashive this. Also moved out dx*2, dy*2 calculation outside of loop for better performance.
59 lines
852 B
ArmAsm
Executable file
59 lines
852 B
ArmAsm
Executable file
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.macro Add_16 a_low, a_hi, b_low, b_hi ; a = a + b
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CLC
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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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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 ; a = a - b
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SEC
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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_ ; [low, hi] = [low, hi]*2
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CLC
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ROL low_
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ROL hi_
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.endmacro
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;.proc Sub_abs_8 ;return, primary, secondary
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; LDA primary
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; SEC
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; SBC secondary
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; BPL end_;we got z positive result
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; LDA secondary
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; SEC
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; SBC primary
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; end_:
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; STA return
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;.endproc
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;
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;.proc poer ;low, hi, in ; [low, hi] = [in]^2
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; LDY in
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; STY low
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; LDA #$00
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; STA hi
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; ;pow:
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; DEY ; count = count -1
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; BEQ y_pow_end;
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; CLC
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; LDA in
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; ADC low
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; STA low
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; LDA #$00
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; ADC hi
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; STA hi
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; ;jmp pow
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; y_pow_end:
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;.endproc
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