| 1 |
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| 2 | #ifndef _VIDEO_ATAFB_UTILS_H
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| 3 | #define _VIDEO_ATAFB_UTILS_H
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| 4 |
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| 5 | |
| 6 |
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| 7 | |
| 8 |
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| 9 | |
| 10 |
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| 11 | |
| 12 | * pages.
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| 13 | *
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| 14 | * These functions are drop in replacements for memmove and
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| 15 | * memset(_, 0, _). However their five instances add at least a kilobyte
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| 16 | * to the object file. You have been warned.
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| 17 | *
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| 18 | * Not a great fan of assembler for the sake of it, but I think
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| 19 | * that these routines are at least 10 times faster than their C
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| 20 | * equivalents for large blits, and that's important to the lowest level of
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| 21 | * a graphics driver. Question is whether some scheme with the blitter
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| 22 | * would be faster. I suspect not for simple text system - not much
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| 23 | * asynchrony.
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| 24 | *
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| 25 | * Code is very simple, just gruesome expansion. Basic strategy is to
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| 26 | * increase data moved/cleared at each step to 16 bytes to reduce
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| 27 | * instruction per data move overhead. movem might be faster still
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| 28 | * For more than 15 bytes, we try to align the write direction on a
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| 29 | * longword boundary to get maximum speed. This is even more gruesome.
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| 30 | * Unaligned read/write used requires 68020+ - think this is a problem?
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| 31 | *
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| 32 | * Sorry!
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| 33 |
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| 34 |
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| 35 |
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| 36 | |
| 37 | * aspects, e.g. moveq instead of movel, let gcc choose the registers,
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| 38 | * use movem in some places...
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| 39 | * For other modes than 1 plane, lots of more such assembler functions
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| 40 | * were needed (e.g. the ones using movep or expanding color values).
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| 41 |
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| 42 |
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| 43 | |
| 44 | subl #65536,d0 replaced by clrw d0; subql #1,d0 for dbcc
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| 45 | addal is faster than addaw
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| 46 | movep is rather expensive compared to ordinary move's
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| 47 | some functions rewritten in C for clarity, no speed loss
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| 48 |
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| 49 | static inline void *fb_memclear_small(void *s, size_t count)
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| 50 | {
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| 51 | if (!count)
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| 52 | return 0;
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| 53 |
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| 54 | asm volatile ("\n"
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| 55 | " lsr.l #1,%1 ; jcc 1f ; move.b %2,-(%0)\n"
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| 56 | "1: lsr.l #1,%1 ; jcc 1f ; move.w %2,-(%0)\n"
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| 57 | "1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0)\n"
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| 58 | "1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0) ; move.l %2,-(%0)\n"
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| 59 | "1:"
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| 60 | : "=a" (s), "=d" (count)
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| 61 | : "d" (0), "0" ((char *)s + count), "1" (count));
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| 62 | asm volatile ("\n"
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| 63 | " subq.l #1,%1\n"
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| 64 | " jcs 3f\n"
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| 65 | " move.l %2,%%d4; move.l %2,%%d5; move.l %2,%%d6\n"
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| 66 | "2: movem.l %2/%%d4/%%d5/%%d6,-(%0)\n"
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| 67 | " dbra %1,2b\n"
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| 68 | "3:"
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| 69 | : "=a" (s), "=d" (count)
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| 70 | : "d" (0), "0" (s), "1" (count)
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| 71 | : "d4", "d5", "d6"
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| 72 | );
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| 73 |
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| 74 | return 0;
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| 75 | }
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| 76 |
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| 77 |
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| 78 | static inline void *fb_memclear(void *s, size_t count)
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| 79 | {
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| 80 | if (!count)
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| 81 | return 0;
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| 82 |
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| 83 | if (count < 16) {
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| 84 | asm volatile ("\n"
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| 85 | " lsr.l #1,%1 ; jcc 1f ; clr.b (%0)+\n"
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| 86 | "1: lsr.l #1,%1 ; jcc 1f ; clr.w (%0)+\n"
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| 87 | "1: lsr.l #1,%1 ; jcc 1f ; clr.l (%0)+\n"
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| 88 | "1: lsr.l #1,%1 ; jcc 1f ; clr.l (%0)+ ; clr.l (%0)+\n"
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| 89 | "1:"
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| 90 | : "=a" (s), "=d" (count)
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| 91 | : "0" (s), "1" (count));
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| 92 | } else {
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| 93 | long tmp;
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| 94 | asm volatile ("\n"
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| 95 | " move.l %1,%2\n"
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| 96 | " lsr.l #1,%2 ; jcc 1f ; clr.b (%0)+ ; subq.w #1,%1\n"
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| 97 | " lsr.l #1,%2 ; jcs 2f\n"
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| 98 | " clr.w (%0)+ ; subq.w #2,%1 ; jra 2f\n"
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| 99 | "1: lsr.l #1,%2 ; jcc 2f\n"
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| 100 | " clr.w (%0)+ ; subq.w #2,%1\n"
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| 101 | "2: move.w %1,%2; lsr.l #2,%1 ; jeq 6f\n"
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| 102 | " lsr.l #1,%1 ; jcc 3f ; clr.l (%0)+\n"
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| 103 | "3: lsr.l #1,%1 ; jcc 4f ; clr.l (%0)+ ; clr.l (%0)+\n"
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| 104 | "4: subq.l #1,%1 ; jcs 6f\n"
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| 105 | "5: clr.l (%0)+; clr.l (%0)+ ; clr.l (%0)+ ; clr.l (%0)+\n"
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| 106 | " dbra %1,5b ; clr.w %1; subq.l #1,%1; jcc 5b\n"
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| 107 | "6: move.w %2,%1; btst #1,%1 ; jeq 7f ; clr.w (%0)+\n"
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| 108 | "7: btst #0,%1 ; jeq 8f ; clr.b (%0)+\n"
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| 109 | "8:"
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| 110 | : "=a" (s), "=d" (count), "=d" (tmp)
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| 111 | : "0" (s), "1" (count));
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| 112 | }
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| 113 |
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| 114 | return 0;
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| 115 | }
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| 116 |
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| 117 |
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| 118 | static inline void *fb_memset255(void *s, size_t count)
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| 119 | {
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| 120 | if (!count)
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| 121 | return 0;
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| 122 |
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| 123 | asm volatile ("\n"
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| 124 | " lsr.l #1,%1 ; jcc 1f ; move.b %2,-(%0)\n"
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| 125 | "1: lsr.l #1,%1 ; jcc 1f ; move.w %2,-(%0)\n"
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| 126 | "1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0)\n"
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| 127 | "1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0) ; move.l %2,-(%0)\n"
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| 128 | "1:"
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| 129 | : "=a" (s), "=d" (count)
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| 130 | : "d" (-1), "0" ((char *)s+count), "1" (count));
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| 131 | asm volatile ("\n"
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| 132 | " subq.l #1,%1 ; jcs 3f\n"
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| 133 | " move.l %2,%%d4; move.l %2,%%d5; move.l %2,%%d6\n"
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| 134 | "2: movem.l %2/%%d4/%%d5/%%d6,-(%0)\n"
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| 135 | " dbra %1,2b\n"
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| 136 | "3:"
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| 137 | : "=a" (s), "=d" (count)
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| 138 | : "d" (-1), "0" (s), "1" (count)
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| 139 | : "d4", "d5", "d6");
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| 140 |
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| 141 | return 0;
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| 142 | }
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| 143 |
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| 144 |
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| 145 | static inline void *fb_memmove(void *d, const void *s, size_t count)
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| 146 | {
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| 147 | if (d < s) {
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| 148 | if (count < 16) {
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| 149 | asm volatile ("\n"
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| 150 | " lsr.l #1,%2 ; jcc 1f ; move.b (%1)+,(%0)+\n"
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| 151 | "1: lsr.l #1,%2 ; jcc 1f ; move.w (%1)+,(%0)+\n"
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| 152 | "1: lsr.l #1,%2 ; jcc 1f ; move.l (%1)+,(%0)+\n"
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| 153 | "1: lsr.l #1,%2 ; jcc 1f ; move.l (%1)+,(%0)+ ; move.l (%1)+,(%0)+\n"
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| 154 | "1:"
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| 155 | : "=a" (d), "=a" (s), "=d" (count)
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| 156 | : "0" (d), "1" (s), "2" (count));
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| 157 | } else {
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| 158 | long tmp;
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| 159 | asm volatile ("\n"
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| 160 | " move.l %0,%3\n"
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| 161 | " lsr.l #1,%3 ; jcc 1f ; move.b (%1)+,(%0)+ ; subqw #1,%2\n"
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| 162 | " lsr.l #1,%3 ; jcs 2f\n"
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| 163 | " move.w (%1)+,(%0)+ ; subqw #2,%2 ; jra 2f\n"
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| 164 | "1: lsr.l #1,%3 ; jcc 2f\n"
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| 165 | " move.w (%1)+,(%0)+ ; subqw #2,%2\n"
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| 166 | "2: move.w %2,%-; lsr.l #2,%2 ; jeq 6f\n"
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| 167 | " lsr.l #1,%2 ; jcc 3f ; move.l (%1)+,(%0)+\n"
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| 168 | "3: lsr.l #1,%2 ; jcc 4f ; move.l (%1)+,(%0)+ ; move.l (%1)+,(%0)+\n"
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| 169 | "4: subq.l #1,%2 ; jcs 6f\n"
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| 170 | "5: move.l (%1)+,(%0)+; move.l (%1)+,(%0)+\n"
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| 171 | " move.l (%1)+,(%0)+; move.l (%1)+,(%0)+\n"
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| 172 | " dbra %2,5b ; clr.w %2; subq.l #1,%2; jcc 5b\n"
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| 173 | "6: move.w %+,%2; btst #1,%2 ; jeq 7f ; move.w (%1)+,(%0)+\n"
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| 174 | "7: btst #0,%2 ; jeq 8f ; move.b (%1)+,(%0)+\n"
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| 175 | "8:"
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| 176 | : "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
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| 177 | : "0" (d), "1" (s), "2" (count));
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| 178 | }
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| 179 | } else {
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| 180 | if (count < 16) {
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| 181 | asm volatile ("\n"
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| 182 | " lsr.l #1,%2 ; jcc 1f ; move.b -(%1),-(%0)\n"
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| 183 | "1: lsr.l #1,%2 ; jcc 1f ; move.w -(%1),-(%0)\n"
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| 184 | "1: lsr.l #1,%2 ; jcc 1f ; move.l -(%1),-(%0)\n"
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| 185 | "1: lsr.l #1,%2 ; jcc 1f ; move.l -(%1),-(%0) ; move.l -(%1),-(%0)\n"
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| 186 | "1:"
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| 187 | : "=a" (d), "=a" (s), "=d" (count)
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| 188 | : "0" ((char *) d + count), "1" ((char *) s + count), "2" (count));
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| 189 | } else {
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| 190 | long tmp;
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| 191 |
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| 192 | asm volatile ("\n"
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| 193 | " move.l %0,%3\n"
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| 194 | " lsr.l #1,%3 ; jcc 1f ; move.b -(%1),-(%0) ; subqw #1,%2\n"
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| 195 | " lsr.l #1,%3 ; jcs 2f\n"
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| 196 | " move.w -(%1),-(%0) ; subqw #2,%2 ; jra 2f\n"
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| 197 | "1: lsr.l #1,%3 ; jcc 2f\n"
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| 198 | " move.w -(%1),-(%0) ; subqw #2,%2\n"
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| 199 | "2: move.w %2,%-; lsr.l #2,%2 ; jeq 6f\n"
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| 200 | " lsr.l #1,%2 ; jcc 3f ; move.l -(%1),-(%0)\n"
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| 201 | "3: lsr.l #1,%2 ; jcc 4f ; move.l -(%1),-(%0) ; move.l -(%1),-(%0)\n"
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| 202 | "4: subq.l #1,%2 ; jcs 6f\n"
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| 203 | "5: move.l -(%1),-(%0); move.l -(%1),-(%0)\n"
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| 204 | " move.l -(%1),-(%0); move.l -(%1),-(%0)\n"
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| 205 | " dbra %2,5b ; clr.w %2; subq.l #1,%2; jcc 5b\n"
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| 206 | "6: move.w %+,%2; btst #1,%2 ; jeq 7f ; move.w -(%1),-(%0)\n"
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| 207 | "7: btst #0,%2 ; jeq 8f ; move.b -(%1),-(%0)\n"
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| 208 | "8:"
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| 209 | : "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
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| 210 | : "0" ((char *) d + count), "1" ((char *) s + count), "2" (count));
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| 211 | }
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| 212 | }
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| 213 |
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| 214 | return 0;
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| 215 | }
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| 216 |
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| 217 |
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| 218 | |
| 219 | divisible by 16, suitable for moving the whole screen bitplane
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| 220 | static inline void fast_memmove(char *dst, const char *src, size_t size)
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| 221 | {
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| 222 | if (!size)
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| 223 | return;
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| 224 | if (dst < src)
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| 225 | asm volatile ("\n"
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| 226 | "1: movem.l (%0)+,%%d0/%%d1/%%a0/%%a1\n"
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| 227 | " movem.l %%d0/%%d1/%%a0/%%a1,%1@\n"
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| 228 | " addq.l #8,%1; addq.l #8,%1\n"
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| 229 | " dbra %2,1b\n"
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| 230 | " clr.w %2; subq.l #1,%2\n"
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| 231 | " jcc 1b"
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| 232 | : "=a" (src), "=a" (dst), "=d" (size)
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| 233 | : "0" (src), "1" (dst), "2" (size / 16 - 1)
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| 234 | : "d0", "d1", "a0", "a1", "memory");
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| 235 | else
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| 236 | asm volatile ("\n"
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| 237 | "1: subq.l #8,%0; subq.l #8,%0\n"
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| 238 | " movem.l %0@,%%d0/%%d1/%%a0/%%a1\n"
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| 239 | " movem.l %%d0/%%d1/%%a0/%%a1,-(%1)\n"
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| 240 | " dbra %2,1b\n"
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| 241 | " clr.w %2; subq.l #1,%2\n"
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| 242 | " jcc 1b"
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| 243 | : "=a" (src), "=a" (dst), "=d" (size)
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| 244 | : "0" (src + size), "1" (dst + size), "2" (size / 16 - 1)
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| 245 | : "d0", "d1", "a0", "a1", "memory");
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| 246 | }
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| 247 |
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| 248 | #ifdef BPL
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| 249 |
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| 250 | |
| 251 | * This expands a up to 8 bit color into two longs
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| 252 | * for movel operations.
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| 253 |
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| 254 | static const u32 four2long[] = {
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| 255 | 0x00000000, 0x000000ff, 0x0000ff00, 0x0000ffff,
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| 256 | 0x00ff0000, 0x00ff00ff, 0x00ffff00, 0x00ffffff,
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| 257 | 0xff000000, 0xff0000ff, 0xff00ff00, 0xff00ffff,
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| 258 | 0xffff0000, 0xffff00ff, 0xffffff00, 0xffffffff,
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| 259 | };
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| 260 |
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| 261 | static inline void expand8_col2mask(u8 c, u32 m[])
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| 262 | {
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| 263 | m[0] = four2long[c & 15];
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| 264 | #if BPL > 4
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| 265 | m[1] = four2long[c >> 4];
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| 266 | #endif
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| 267 | }
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| 268 |
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| 269 | static inline void expand8_2col2mask(u8 fg, u8 bg, u32 fgm[], u32 bgm[])
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| 270 | {
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| 271 | fgm[0] = four2long[fg & 15] ^ (bgm[0] = four2long[bg & 15]);
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| 272 | #if BPL > 4
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| 273 | fgm[1] = four2long[fg >> 4] ^ (bgm[1] = four2long[bg >> 4]);
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| 274 | #endif
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| 275 | }
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| 276 |
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| 277 | |
| 278 | * set an 8bit value to a color
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| 279 |
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| 280 | static inline void fill8_col(u8 *dst, u32 m[])
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| 281 | {
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| 282 | u32 tmp = m[0];
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| 283 | dst[0] = tmp;
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| 284 | dst[2] = (tmp >>= 8);
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| 285 | #if BPL > 2
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| 286 | dst[4] = (tmp >>= 8);
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| 287 | dst[6] = tmp >> 8;
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| 288 | #endif
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| 289 | #if BPL > 4
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| 290 | tmp = m[1];
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| 291 | dst[8] = tmp;
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| 292 | dst[10] = (tmp >>= 8);
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| 293 | dst[12] = (tmp >>= 8);
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| 294 | dst[14] = tmp >> 8;
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| 295 | #endif
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| 296 | }
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| 297 |
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| 298 | |
| 299 | * set an 8bit value according to foreground/background color
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| 300 |
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| 301 | static inline void fill8_2col(u8 *dst, u8 fg, u8 bg, u32 mask)
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| 302 | {
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| 303 | u32 fgm[2], bgm[2], tmp;
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| 304 |
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| 305 | expand8_2col2mask(fg, bg, fgm, bgm);
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| 306 |
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| 307 | mask |= mask << 8;
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| 308 | #if BPL > 2
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| 309 | mask |= mask << 16;
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| 310 | #endif
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| 311 | tmp = (mask & fgm[0]) ^ bgm[0];
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| 312 | dst[0] = tmp;
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| 313 | dst[2] = (tmp >>= 8);
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| 314 | #if BPL > 2
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| 315 | dst[4] = (tmp >>= 8);
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| 316 | dst[6] = tmp >> 8;
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| 317 | #endif
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| 318 | #if BPL > 4
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| 319 | tmp = (mask & fgm[1]) ^ bgm[1];
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| 320 | dst[8] = tmp;
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| 321 | dst[10] = (tmp >>= 8);
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| 322 | dst[12] = (tmp >>= 8);
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| 323 | dst[14] = tmp >> 8;
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| 324 | #endif
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| 325 | }
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| 326 |
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| 327 | static const u32 two2word[] = {
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| 328 | 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
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| 329 | };
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| 330 |
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| 331 | static inline void expand16_col2mask(u8 c, u32 m[])
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| 332 | {
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| 333 | m[0] = two2word[c & 3];
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| 334 | #if BPL > 2
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| 335 | m[1] = two2word[(c >> 2) & 3];
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| 336 | #endif
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| 337 | #if BPL > 4
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| 338 | m[2] = two2word[(c >> 4) & 3];
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| 339 | m[3] = two2word[c >> 6];
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| 340 | #endif
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| 341 | }
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| 342 |
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| 343 | static inline void expand16_2col2mask(u8 fg, u8 bg, u32 fgm[], u32 bgm[])
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| 344 | {
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| 345 | bgm[0] = two2word[bg & 3];
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| 346 | fgm[0] = two2word[fg & 3] ^ bgm[0];
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| 347 | #if BPL > 2
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| 348 | bgm[1] = two2word[(bg >> 2) & 3];
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| 349 | fgm[1] = two2word[(fg >> 2) & 3] ^ bgm[1];
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| 350 | #endif
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| 351 | #if BPL > 4
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| 352 | bgm[2] = two2word[(bg >> 4) & 3];
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| 353 | fgm[2] = two2word[(fg >> 4) & 3] ^ bgm[2];
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| 354 | bgm[3] = two2word[bg >> 6];
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| 355 | fgm[3] = two2word[fg >> 6] ^ bgm[3];
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| 356 | #endif
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| 357 | }
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| 358 |
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| 359 | static inline u32 *fill16_col(u32 *dst, int rows, u32 m[])
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| 360 | {
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| 361 | while (rows) {
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| 362 | *dst++ = m[0];
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| 363 | #if BPL > 2
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| 364 | *dst++ = m[1];
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| 365 | #endif
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| 366 | #if BPL > 4
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| 367 | *dst++ = m[2];
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| 368 | *dst++ = m[3];
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| 369 | #endif
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| 370 | rows--;
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| 371 | }
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| 372 | return dst;
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| 373 | }
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| 374 |
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| 375 | static inline void memmove32_col(void *dst, void *src, u32 mask, u32 h, u32 bytes)
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| 376 | {
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| 377 | u32 *s, *d, v;
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| 378 |
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| 379 | s = src;
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| 380 | d = dst;
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| 381 | do {
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| 382 | v = (*s++ & mask) | (*d & ~mask);
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| 383 | *d++ = v;
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| 384 | #if BPL > 2
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| 385 | v = (*s++ & mask) | (*d & ~mask);
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| 386 | *d++ = v;
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| 387 | #endif
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| 388 | #if BPL > 4
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| 389 | v = (*s++ & mask) | (*d & ~mask);
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| 390 | *d++ = v;
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| 391 | v = (*s++ & mask) | (*d & ~mask);
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| 392 | *d++ = v;
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| 393 | #endif
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| 394 | d = (u32 *)((u8 *)d + bytes);
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| 395 | s = (u32 *)((u8 *)s + bytes);
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| 396 | } while (--h);
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| 397 | }
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| 398 |
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| 399 | #endif
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| 400 |
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| 401 | #endif
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