source: xtideuniversalbios/trunk/Assembly_Library/Inc/Math.inc @ 184

Last change on this file since 184 was 181, checked in by krille_n_@…, 13 years ago

Changes to all parts of the project:

  • Size optimizations.
  • Added a define (EXCLUDE_FROM_XTIDECFG) to exclude unused library code from XTIDECFG.
  • Tried to minimize time spent with interrupts disabled.
  • Some minor attempts to improve speed (reordering instructions etc).
  • Tried to improve readability, did some cleanup and fixed some errors in comments.
File size: 1.8 KB
RevLine 
[41]1; Project name  :   Assembly Library
2; Description   :   Math related macros.
3%ifndef MATH_INC
4%define MATH_INC
5
6FALSE       EQU     0
7TRUE        EQU     1
8
9
10;--------------------------------------------------------------------
11; MIN_U     Unsigned comparison
12; MIN_S     Signed comparison
13;   Parameters:
14;       %1:     Operand 1
15;       %2:     Operand 2
16;   Returns:
17;       %1:     Lesser operand
18;   Corrupts registers:
19;       Nothing
20;--------------------------------------------------------------------
21%macro MIN_U 2
22    cmp     %1, %2              ; Is %1 smaller?
23    jb      %%Return            ;  If so, return
24    mov     %1, %2              ; Copy %2 to %1
25ALIGN JUMP_ALIGN
26%%Return:
27%endmacro
28
29%macro MIN_S 2
30    cmp     %1, %2              ; Is %1 smaller?
31    jl      %%Return            ;  If so, return
32    mov     %1, %2              ; Copy %2 to %1
33ALIGN JUMP_ALIGN
34%%Return:
35%endmacro
36
37
38;--------------------------------------------------------------------
39; MAX_U     Unsigned comparison
40; MAX_S     Signed comparison
41;   Parameters:
42;       %1:     Operand 1
43;       %2:     Operand 2
44;   Returns:
[181]45;       %1:     Greater operand
[41]46;   Corrupts registers:
47;       Nothing
48;--------------------------------------------------------------------
49%macro MAX_U 2
50    cmp     %1, %2              ; Is %1 greater?
51    ja      %%Return            ;  If so, return
52    mov     %1, %2              ; Copy %2 to %1
53ALIGN JUMP_ALIGN
54%%Return:
55%endmacro
56
57%macro MAX_S 2
58    cmp     %1, %2              ; Is %1 greater?
59    jg      %%Return            ;  If so, return
60    mov     %1, %2              ; Copy %2 to %1
61ALIGN JUMP_ALIGN
62%%Return:
63%endmacro
64
65
[172]66;--------------------------------------------------------------------
67; SHR_DXAX
68;   Parameters:
69;       %1:     Number of bits to shift
70;   Returns:
71;       DX:AX   Shifted value
72;   Corrupts registers:
73;       CX
74;--------------------------------------------------------------------
75%macro SHR_DXAX 1
76    %ifnidni %1, cx
77        mov     cx, %1
78    %endif
79ALIGN JUMP_ALIGN
80.ShiftNextBit:
81    shr     dx, 1
82    rcr     ax, 1
83    loop    .ShiftNextBit
84%endmacro
85
86
[41]87%endif ; MATH_INC
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