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mlpdsp.c
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1 /*
2  * MLP DSP functions x86-optimized
3  * Copyright (c) 2009 Ramiro Polla
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/attributes.h"
23 #include "libavutil/cpu.h"
24 #include "libavutil/x86/asm.h"
25 #include "libavutil/x86/cpu.h"
26 #include "libavcodec/mlpdsp.h"
27 #include "libavcodec/mlp.h"
28 
29 #if HAVE_7REGS && HAVE_INLINE_ASM
30 
31 extern char ff_mlp_firorder_8;
32 extern char ff_mlp_firorder_7;
33 extern char ff_mlp_firorder_6;
34 extern char ff_mlp_firorder_5;
35 extern char ff_mlp_firorder_4;
36 extern char ff_mlp_firorder_3;
37 extern char ff_mlp_firorder_2;
38 extern char ff_mlp_firorder_1;
39 extern char ff_mlp_firorder_0;
40 
41 extern char ff_mlp_iirorder_4;
42 extern char ff_mlp_iirorder_3;
43 extern char ff_mlp_iirorder_2;
44 extern char ff_mlp_iirorder_1;
45 extern char ff_mlp_iirorder_0;
46 
47 static const void *firtable[9] = { &ff_mlp_firorder_0, &ff_mlp_firorder_1,
48  &ff_mlp_firorder_2, &ff_mlp_firorder_3,
49  &ff_mlp_firorder_4, &ff_mlp_firorder_5,
50  &ff_mlp_firorder_6, &ff_mlp_firorder_7,
51  &ff_mlp_firorder_8 };
52 static const void *iirtable[5] = { &ff_mlp_iirorder_0, &ff_mlp_iirorder_1,
53  &ff_mlp_iirorder_2, &ff_mlp_iirorder_3,
54  &ff_mlp_iirorder_4 };
55 
56 #if ARCH_X86_64
57 
58 #define MLPMUL(label, offset, offs, offc) \
59  LABEL_MANGLE(label)": \n\t" \
60  "movslq "offset"+"offs"(%0), %%rax\n\t" \
61  "movslq "offset"+"offc"(%1), %%rdx\n\t" \
62  "imul %%rdx, %%rax\n\t" \
63  "add %%rax, %%rsi\n\t"
64 
65 #define FIRMULREG(label, offset, firc)\
66  LABEL_MANGLE(label)": \n\t" \
67  "movslq "#offset"(%0), %%rax\n\t" \
68  "imul %"#firc", %%rax\n\t" \
69  "add %%rax, %%rsi\n\t"
70 
71 #define CLEAR_ACCUM \
72  "xor %%rsi, %%rsi\n\t"
73 
74 #define SHIFT_ACCUM \
75  "shr %%cl, %%rsi\n\t"
76 
77 #define ACCUM "%%rdx"
78 #define RESULT "%%rsi"
79 #define RESULT32 "%%esi"
80 
81 #else /* if ARCH_X86_32 */
82 
83 #define MLPMUL(label, offset, offs, offc) \
84  LABEL_MANGLE(label)": \n\t" \
85  "mov "offset"+"offs"(%0), %%eax\n\t" \
86  "imull "offset"+"offc"(%1) \n\t" \
87  "add %%eax , %%esi\n\t" \
88  "adc %%edx , %%ecx\n\t"
89 
90 #define FIRMULREG(label, offset, firc) \
91  MLPMUL(label, #offset, "0", "0")
92 
93 #define CLEAR_ACCUM \
94  "xor %%esi, %%esi\n\t" \
95  "xor %%ecx, %%ecx\n\t"
96 
97 #define SHIFT_ACCUM \
98  "mov %%ecx, %%edx\n\t" \
99  "mov %%esi, %%eax\n\t" \
100  "movzbl %7 , %%ecx\n\t" \
101  "shrd %%cl, %%edx, %%eax\n\t" \
102 
103 #define ACCUM "%%edx"
104 #define RESULT "%%eax"
105 #define RESULT32 "%%eax"
106 
107 #endif /* !ARCH_X86_64 */
108 
109 #define BINC AV_STRINGIFY(4* MAX_CHANNELS)
110 #define IOFFS AV_STRINGIFY(4*(MAX_FIR_ORDER + MAX_BLOCKSIZE))
111 #define IOFFC AV_STRINGIFY(4* MAX_FIR_ORDER)
112 
113 #define FIRMUL(label, offset) MLPMUL(label, #offset, "0", "0")
114 #define IIRMUL(label, offset) MLPMUL(label, #offset, IOFFS, IOFFC)
115 
116 static void mlp_filter_channel_x86(int32_t *state, const int32_t *coeff,
117  int firorder, int iirorder,
118  unsigned int filter_shift, int32_t mask,
119  int blocksize, int32_t *sample_buffer)
120 {
121  const void *firjump = firtable[firorder];
122  const void *iirjump = iirtable[iirorder];
123 
124  blocksize = -blocksize;
125 
126  __asm__ volatile(
127  "1: \n\t"
128  CLEAR_ACCUM
129  "jmp *%5 \n\t"
130  FIRMUL (ff_mlp_firorder_8, 0x1c )
131  FIRMUL (ff_mlp_firorder_7, 0x18 )
132  FIRMUL (ff_mlp_firorder_6, 0x14 )
133  FIRMUL (ff_mlp_firorder_5, 0x10 )
134  FIRMUL (ff_mlp_firorder_4, 0x0c )
135  FIRMULREG(ff_mlp_firorder_3, 0x08,10)
136  FIRMULREG(ff_mlp_firorder_2, 0x04, 9)
137  FIRMULREG(ff_mlp_firorder_1, 0x00, 8)
138  LABEL_MANGLE(ff_mlp_firorder_0)":\n\t"
139  "jmp *%6 \n\t"
140  IIRMUL (ff_mlp_iirorder_4, 0x0c )
141  IIRMUL (ff_mlp_iirorder_3, 0x08 )
142  IIRMUL (ff_mlp_iirorder_2, 0x04 )
143  IIRMUL (ff_mlp_iirorder_1, 0x00 )
144  LABEL_MANGLE(ff_mlp_iirorder_0)":\n\t"
145  SHIFT_ACCUM
146  "mov "RESULT" ,"ACCUM" \n\t"
147  "add (%2) ,"RESULT" \n\t"
148  "and %4 ,"RESULT" \n\t"
149  "sub $4 , %0 \n\t"
150  "mov "RESULT32", (%0) \n\t"
151  "mov "RESULT32", (%2) \n\t"
152  "add $"BINC" , %2 \n\t"
153  "sub "ACCUM" ,"RESULT" \n\t"
154  "mov "RESULT32","IOFFS"(%0) \n\t"
155  "incl %3 \n\t"
156  "js 1b \n\t"
157  : /* 0*/"+r"(state),
158  /* 1*/"+r"(coeff),
159  /* 2*/"+r"(sample_buffer),
160 #if ARCH_X86_64
161  /* 3*/"+r"(blocksize)
162  : /* 4*/"r"((x86_reg)mask), /* 5*/"r"(firjump),
163  /* 6*/"r"(iirjump) , /* 7*/"c"(filter_shift)
164  , /* 8*/"r"((int64_t)coeff[0])
165  , /* 9*/"r"((int64_t)coeff[1])
166  , /*10*/"r"((int64_t)coeff[2])
167  : "rax", "rdx", "rsi"
168 #else /* ARCH_X86_32 */
169  /* 3*/"+m"(blocksize)
170  : /* 4*/"m"( mask), /* 5*/"m"(firjump),
171  /* 6*/"m"(iirjump) , /* 7*/"m"(filter_shift)
172  : "eax", "edx", "esi", "ecx"
173 #endif /* !ARCH_X86_64 */
174  );
175 }
176 
177 #endif /* HAVE_7REGS && HAVE_INLINE_ASM */
178 
179 av_cold void ff_mlpdsp_init_x86(MLPDSPContext *c)
180 {
181 #if HAVE_7REGS && HAVE_INLINE_ASM
182  int cpu_flags = av_get_cpu_flags();
183  if (INLINE_MMX(cpu_flags))
184  c->mlp_filter_channel = mlp_filter_channel_x86;
185 #endif
186 }
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