| 1 | ; Project name : Assembly Library
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| 2 | ; Description : Math related macros.
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| 3 | %ifndef MATH_INC
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| 4 | %define MATH_INC
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| 5 |
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| 6 | FALSE EQU 0
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| 7 | TRUE EQU 1
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| 8 |
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| 9 |
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| 10 | ;--------------------------------------------------------------------
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| 11 | ; MIN_U Unsigned comparison
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| 12 | ; MIN_S Signed comparison
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| 13 | ; Parameters:
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| 14 | ; %1: Operand 1
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| 15 | ; %2: Operand 2
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| 16 | ; Returns:
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| 17 | ; %1: Lesser operand
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| 18 | ; Corrupts registers:
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| 19 | ; Nothing
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| 20 | ;--------------------------------------------------------------------
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| 21 | %macro MIN_U 2
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| 22 | cmp %1, %2 ; Is %1 smaller?
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| 23 | jb %%Return ; If so, return
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| 24 | mov %1, %2 ; Copy %2 to %1
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| 25 | ALIGN JUMP_ALIGN
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| 26 | %%Return:
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| 27 | %endmacro
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| 28 |
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| 29 | %macro MIN_S 2
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| 30 | cmp %1, %2 ; Is %1 smaller?
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| 31 | jl %%Return ; If so, return
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| 32 | mov %1, %2 ; Copy %2 to %1
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| 33 | ALIGN JUMP_ALIGN
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| 34 | %%Return:
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| 35 | %endmacro
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| 36 |
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| 37 |
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| 38 | ;--------------------------------------------------------------------
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| 39 | ; MAX_U Unsigned comparison
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| 40 | ; MAX_S Signed comparison
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| 41 | ; Parameters:
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| 42 | ; %1: Operand 1
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| 43 | ; %2: Operand 2
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| 44 | ; Returns:
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| 45 | ; %1: Lesser operand
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| 46 | ; Corrupts registers:
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| 47 | ; Nothing
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| 48 | ;--------------------------------------------------------------------
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| 49 | %macro MAX_U 2
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| 50 | cmp %1, %2 ; Is %1 greater?
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| 51 | ja %%Return ; If so, return
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| 52 | mov %1, %2 ; Copy %2 to %1
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| 53 | ALIGN JUMP_ALIGN
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| 54 | %%Return:
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| 55 | %endmacro
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| 56 |
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| 57 | %macro MAX_S 2
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| 58 | cmp %1, %2 ; Is %1 greater?
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| 59 | jg %%Return ; If so, return
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| 60 | mov %1, %2 ; Copy %2 to %1
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| 61 | ALIGN JUMP_ALIGN
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| 62 | %%Return:
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| 63 | %endmacro
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| 64 |
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| 65 |
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| 66 | ;--------------------------------------------------------------------
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| 67 | ; SHR_DXAX
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| 68 | ; Parameters:
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| 69 | ; %1: Number of bits to shift
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| 70 | ; Returns:
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| 71 | ; DX:AX Shifted value
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| 72 | ; Corrupts registers:
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| 73 | ; CX
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| 74 | ;--------------------------------------------------------------------
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| 75 | %macro SHR_DXAX 1
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| 76 | %ifnidni %1, cx
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| 77 | mov cx, %1
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| 78 | %endif
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| 79 | ALIGN JUMP_ALIGN
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| 80 | .ShiftNextBit:
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| 81 | shr dx, 1
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| 82 | rcr ax, 1
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| 83 | loop .ShiftNextBit
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| 84 | %endmacro
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| 85 |
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| 86 |
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| 87 | %endif ; MATH_INC
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