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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/x86/asm.h"
23 #include "libavcodec/mlpdsp.h"
24 #include "libavcodec/mlp.h"
25 
26 #if HAVE_7REGS && HAVE_INLINE_ASM
27 
28 extern char ff_mlp_firorder_8;
29 extern char ff_mlp_firorder_7;
30 extern char ff_mlp_firorder_6;
31 extern char ff_mlp_firorder_5;
32 extern char ff_mlp_firorder_4;
33 extern char ff_mlp_firorder_3;
34 extern char ff_mlp_firorder_2;
35 extern char ff_mlp_firorder_1;
36 extern char ff_mlp_firorder_0;
37 
38 extern char ff_mlp_iirorder_4;
39 extern char ff_mlp_iirorder_3;
40 extern char ff_mlp_iirorder_2;
41 extern char ff_mlp_iirorder_1;
42 extern char ff_mlp_iirorder_0;
43 
44 static const void *firtable[9] = { &ff_mlp_firorder_0, &ff_mlp_firorder_1,
45  &ff_mlp_firorder_2, &ff_mlp_firorder_3,
46  &ff_mlp_firorder_4, &ff_mlp_firorder_5,
47  &ff_mlp_firorder_6, &ff_mlp_firorder_7,
48  &ff_mlp_firorder_8 };
49 static const void *iirtable[5] = { &ff_mlp_iirorder_0, &ff_mlp_iirorder_1,
50  &ff_mlp_iirorder_2, &ff_mlp_iirorder_3,
51  &ff_mlp_iirorder_4 };
52 
53 #if ARCH_X86_64
54 
55 #define MLPMUL(label, offset, offs, offc) \
56  LABEL_MANGLE(label)": \n\t" \
57  "movslq "offset"+"offs"(%0), %%rax\n\t" \
58  "movslq "offset"+"offc"(%1), %%rdx\n\t" \
59  "imul %%rdx, %%rax\n\t" \
60  "add %%rax, %%rsi\n\t"
61 
62 #define FIRMULREG(label, offset, firc)\
63  LABEL_MANGLE(label)": \n\t" \
64  "movslq "#offset"(%0), %%rax\n\t" \
65  "imul %"#firc", %%rax\n\t" \
66  "add %%rax, %%rsi\n\t"
67 
68 #define CLEAR_ACCUM \
69  "xor %%rsi, %%rsi\n\t"
70 
71 #define SHIFT_ACCUM \
72  "shr %%cl, %%rsi\n\t"
73 
74 #define ACCUM "%%rdx"
75 #define RESULT "%%rsi"
76 #define RESULT32 "%%esi"
77 
78 #else /* if ARCH_X86_32 */
79 
80 #define MLPMUL(label, offset, offs, offc) \
81  LABEL_MANGLE(label)": \n\t" \
82  "mov "offset"+"offs"(%0), %%eax\n\t" \
83  "imull "offset"+"offc"(%1) \n\t" \
84  "add %%eax , %%esi\n\t" \
85  "adc %%edx , %%ecx\n\t"
86 
87 #define FIRMULREG(label, offset, firc) \
88  MLPMUL(label, #offset, "0", "0")
89 
90 #define CLEAR_ACCUM \
91  "xor %%esi, %%esi\n\t" \
92  "xor %%ecx, %%ecx\n\t"
93 
94 #define SHIFT_ACCUM \
95  "mov %%ecx, %%edx\n\t" \
96  "mov %%esi, %%eax\n\t" \
97  "movzbl %7 , %%ecx\n\t" \
98  "shrd %%cl, %%edx, %%eax\n\t" \
99 
100 #define ACCUM "%%edx"
101 #define RESULT "%%eax"
102 #define RESULT32 "%%eax"
103 
104 #endif /* !ARCH_X86_64 */
105 
106 #define BINC AV_STRINGIFY(4* MAX_CHANNELS)
107 #define IOFFS AV_STRINGIFY(4*(MAX_FIR_ORDER + MAX_BLOCKSIZE))
108 #define IOFFC AV_STRINGIFY(4* MAX_FIR_ORDER)
109 
110 #define FIRMUL(label, offset) MLPMUL(label, #offset, "0", "0")
111 #define IIRMUL(label, offset) MLPMUL(label, #offset, IOFFS, IOFFC)
112 
113 static void mlp_filter_channel_x86(int32_t *state, const int32_t *coeff,
114  int firorder, int iirorder,
115  unsigned int filter_shift, int32_t mask,
116  int blocksize, int32_t *sample_buffer)
117 {
118  const void *firjump = firtable[firorder];
119  const void *iirjump = iirtable[iirorder];
120 
121  blocksize = -blocksize;
122 
123  __asm__ volatile(
124  "1: \n\t"
125  CLEAR_ACCUM
126  "jmp *%5 \n\t"
127  FIRMUL (ff_mlp_firorder_8, 0x1c )
128  FIRMUL (ff_mlp_firorder_7, 0x18 )
129  FIRMUL (ff_mlp_firorder_6, 0x14 )
130  FIRMUL (ff_mlp_firorder_5, 0x10 )
131  FIRMUL (ff_mlp_firorder_4, 0x0c )
132  FIRMULREG(ff_mlp_firorder_3, 0x08,10)
133  FIRMULREG(ff_mlp_firorder_2, 0x04, 9)
134  FIRMULREG(ff_mlp_firorder_1, 0x00, 8)
135  LABEL_MANGLE(ff_mlp_firorder_0)":\n\t"
136  "jmp *%6 \n\t"
137  IIRMUL (ff_mlp_iirorder_4, 0x0c )
138  IIRMUL (ff_mlp_iirorder_3, 0x08 )
139  IIRMUL (ff_mlp_iirorder_2, 0x04 )
140  IIRMUL (ff_mlp_iirorder_1, 0x00 )
141  LABEL_MANGLE(ff_mlp_iirorder_0)":\n\t"
142  SHIFT_ACCUM
143  "mov "RESULT" ,"ACCUM" \n\t"
144  "add (%2) ,"RESULT" \n\t"
145  "and %4 ,"RESULT" \n\t"
146  "sub $4 , %0 \n\t"
147  "mov "RESULT32", (%0) \n\t"
148  "mov "RESULT32", (%2) \n\t"
149  "add $"BINC" , %2 \n\t"
150  "sub "ACCUM" ,"RESULT" \n\t"
151  "mov "RESULT32","IOFFS"(%0) \n\t"
152  "incl %3 \n\t"
153  "js 1b \n\t"
154  : /* 0*/"+r"(state),
155  /* 1*/"+r"(coeff),
156  /* 2*/"+r"(sample_buffer),
157 #if ARCH_X86_64
158  /* 3*/"+r"(blocksize)
159  : /* 4*/"r"((x86_reg)mask), /* 5*/"r"(firjump),
160  /* 6*/"r"(iirjump) , /* 7*/"c"(filter_shift)
161  , /* 8*/"r"((int64_t)coeff[0])
162  , /* 9*/"r"((int64_t)coeff[1])
163  , /*10*/"r"((int64_t)coeff[2])
164  : "rax", "rdx", "rsi"
165 #else /* ARCH_X86_32 */
166  /* 3*/"+m"(blocksize)
167  : /* 4*/"m"( mask), /* 5*/"m"(firjump),
168  /* 6*/"m"(iirjump) , /* 7*/"m"(filter_shift)
169  : "eax", "edx", "esi", "ecx"
170 #endif /* !ARCH_X86_64 */
171  );
172 }
173 
174 #endif /* HAVE_7REGS && HAVE_INLINE_ASM */
175 
176 void ff_mlpdsp_init_x86(MLPDSPContext *c)
177 {
178 #if HAVE_7REGS && HAVE_INLINE_ASM
179  c->mlp_filter_channel = mlp_filter_channel_x86;
180 #endif
181 }
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