Libav
huffyuvencdsp_mmx.c
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1 /*
2  * SIMD-optimized HuffYUV encoding functions
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * MMX optimization by Nick Kurshev <nickols_k@mail.ru>
7  *
8  * This file is part of Libav.
9  *
10  * Libav is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * Libav is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with Libav; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 #include "libavutil/attributes.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/x86/asm.h"
28 #include "libavutil/x86/cpu.h"
30 #include "libavcodec/mathops.h"
31 
32 #if HAVE_INLINE_ASM
33 
34 static void diff_bytes_mmx(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
35 {
36  x86_reg i = 0;
37 
38  __asm__ volatile (
39  "1: \n\t"
40  "movq (%2, %0), %%mm0 \n\t"
41  "movq (%1, %0), %%mm1 \n\t"
42  "psubb %%mm0, %%mm1 \n\t"
43  "movq %%mm1, (%3, %0) \n\t"
44  "movq 8(%2, %0), %%mm0 \n\t"
45  "movq 8(%1, %0), %%mm1 \n\t"
46  "psubb %%mm0, %%mm1 \n\t"
47  "movq %%mm1, 8(%3, %0) \n\t"
48  "add $16, %0 \n\t"
49  "cmp %4, %0 \n\t"
50  " jb 1b \n\t"
51  : "+r" (i)
52  : "r" (src1), "r" (src2), "r" (dst), "r" ((x86_reg) w - 15));
53 
54  for (; i < w; i++)
55  dst[i + 0] = src1[i + 0] - src2[i + 0];
56 }
57 
58 static void sub_hfyu_median_pred_mmxext(uint8_t *dst, const uint8_t *src1,
59  const uint8_t *src2, int w,
60  int *left, int *left_top)
61 {
62  x86_reg i = 0;
63  uint8_t l, lt;
64 
65  __asm__ volatile (
66  "movq (%1, %0), %%mm0 \n\t" // LT
67  "psllq $8, %%mm0 \n\t"
68  "1: \n\t"
69  "movq (%1, %0), %%mm1 \n\t" // T
70  "movq -1(%2, %0), %%mm2 \n\t" // L
71  "movq (%2, %0), %%mm3 \n\t" // X
72  "movq %%mm2, %%mm4 \n\t" // L
73  "psubb %%mm0, %%mm2 \n\t"
74  "paddb %%mm1, %%mm2 \n\t" // L + T - LT
75  "movq %%mm4, %%mm5 \n\t" // L
76  "pmaxub %%mm1, %%mm4 \n\t" // max(T, L)
77  "pminub %%mm5, %%mm1 \n\t" // min(T, L)
78  "pminub %%mm2, %%mm4 \n\t"
79  "pmaxub %%mm1, %%mm4 \n\t"
80  "psubb %%mm4, %%mm3 \n\t" // dst - pred
81  "movq %%mm3, (%3, %0) \n\t"
82  "add $8, %0 \n\t"
83  "movq -1(%1, %0), %%mm0 \n\t" // LT
84  "cmp %4, %0 \n\t"
85  " jb 1b \n\t"
86  : "+r" (i)
87  : "r" (src1), "r" (src2), "r" (dst), "r" ((x86_reg) w));
88 
89  l = *left;
90  lt = *left_top;
91 
92  dst[0] = src2[0] - mid_pred(l, src1[0], (l + src1[0] - lt) & 0xFF);
93 
94  *left_top = src1[w - 1];
95  *left = src2[w - 1];
96 }
97 
98 #endif /* HAVE_INLINE_ASM */
99 
101 {
102 #if HAVE_INLINE_ASM
103  int cpu_flags = av_get_cpu_flags();
104 
105  if (INLINE_MMX(cpu_flags)) {
106  c->diff_bytes = diff_bytes_mmx;
107  }
108 
109  if (INLINE_MMXEXT(cpu_flags)) {
110  c->sub_hfyu_median_pred = sub_hfyu_median_pred_mmxext;
111  }
112 #endif /* HAVE_INLINE_ASM */
113 }
void(* diff_bytes)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
Definition: huffyuvencdsp.h:25
Macro definitions for various function/variable attributes.
uint8_t
#define av_cold
Definition: attributes.h:66
int x86_reg
Definition: asm.h:70
#define INLINE_MMX(flags)
Definition: cpu.h:63
void(* sub_hfyu_median_pred)(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, int w, int *left, int *left_top)
Subtract HuffYUV&#39;s variant of median prediction.
Definition: huffyuvencdsp.h:33
#define mid_pred
Definition: mathops.h:98
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:47
#define INLINE_MMXEXT(flags)
Definition: cpu.h:64
av_cold void ff_huffyuvencdsp_init_x86(HuffYUVEncDSPContext *c)