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fmtconvert_mips.c
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1 /*
2  * Format Conversion Utils for MIPS
3  *
4  * Copyright (c) 2012
5  * MIPS Technologies, Inc., California.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of is
16  * contributors may be used to endorse or promote products derived from
17  * this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  * Author: Zoran Lukic (zoranl@mips.com)
32  * Author: Nedeljko Babic (nbabic@mips.com)
33  *
34  * This file is part of FFmpeg.
35  *
36  * FFmpeg is free software; you can redistribute it and/or
37  * modify it under the terms of the GNU Lesser General Public
38  * License as published by the Free Software Foundation; either
39  * version 2.1 of the License, or (at your option) any later version.
40  *
41  * FFmpeg is distributed in the hope that it will be useful,
42  * but WITHOUT ANY WARRANTY; without even the implied warranty of
43  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
44  * Lesser General Public License for more details.
45  *
46  * You should have received a copy of the GNU Lesser General Public
47  * License along with FFmpeg; if not, write to the Free Software
48  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
49  */
50 #include "config.h"
51 #include "libavcodec/avcodec.h"
52 #include "libavcodec/fmtconvert.h"
53 #include "libavutil/mips/asmdefs.h"
54 
55 #if HAVE_INLINE_ASM
56 static void int32_to_float_fmul_scalar_mips(float *dst, const int *src,
57  float mul, int len)
58 {
59  /*
60  * variables used in inline assembler
61  */
62  float temp1, temp3, temp5, temp7, temp9, temp11, temp13, temp15;
63 
64  int rpom1, rpom2, rpom11, rpom21, rpom12, rpom22, rpom13, rpom23;
65  const int *src_end = src + len;
66  /*
67  * loop is 8 times unrolled in assembler in order to achieve better performance
68  */
69  __asm__ volatile (
70  "i32tf_lp%=: \n\t"
71  "lw %[rpom11], 0(%[src]) \n\t"
72  "lw %[rpom21], 4(%[src]) \n\t"
73  "lw %[rpom1], 8(%[src]) \n\t"
74  "lw %[rpom2], 12(%[src]) \n\t"
75  "mtc1 %[rpom11], %[temp1] \n\t"
76  "mtc1 %[rpom21], %[temp3] \n\t"
77  "mtc1 %[rpom1], %[temp5] \n\t"
78  "mtc1 %[rpom2], %[temp7] \n\t"
79 
80  "lw %[rpom13], 16(%[src]) \n\t"
81  "lw %[rpom23], 20(%[src]) \n\t"
82  "lw %[rpom12], 24(%[src]) \n\t"
83  "lw %[rpom22], 28(%[src]) \n\t"
84  "mtc1 %[rpom13], %[temp9] \n\t"
85  "mtc1 %[rpom23], %[temp11] \n\t"
86  "mtc1 %[rpom12], %[temp13] \n\t"
87  "mtc1 %[rpom22], %[temp15] \n\t"
88 
89  PTR_ADDIU "%[src], 32 \n\t"
90  "cvt.s.w %[temp1], %[temp1] \n\t"
91  "cvt.s.w %[temp3], %[temp3] \n\t"
92  "cvt.s.w %[temp5], %[temp5] \n\t"
93  "cvt.s.w %[temp7], %[temp7] \n\t"
94 
95  "cvt.s.w %[temp9], %[temp9] \n\t"
96  "cvt.s.w %[temp11], %[temp11] \n\t"
97  "cvt.s.w %[temp13], %[temp13] \n\t"
98  "cvt.s.w %[temp15], %[temp15] \n\t"
99 
100  "mul.s %[temp1], %[temp1], %[mul] \n\t"
101  "mul.s %[temp3], %[temp3], %[mul] \n\t"
102  "mul.s %[temp5], %[temp5], %[mul] \n\t"
103  "mul.s %[temp7], %[temp7], %[mul] \n\t"
104 
105  "mul.s %[temp9], %[temp9], %[mul] \n\t"
106  "mul.s %[temp11], %[temp11], %[mul] \n\t"
107  "mul.s %[temp13], %[temp13], %[mul] \n\t"
108  "mul.s %[temp15], %[temp15], %[mul] \n\t"
109 
110  "swc1 %[temp1], 0(%[dst]) \n\t" /*dst[i] = src[i] * mul; */
111  "swc1 %[temp3], 4(%[dst]) \n\t" /*dst[i+1] = src[i+1] * mul;*/
112  "swc1 %[temp5], 8(%[dst]) \n\t" /*dst[i+2] = src[i+2] * mul;*/
113  "swc1 %[temp7], 12(%[dst]) \n\t" /*dst[i+3] = src[i+3] * mul;*/
114 
115  "swc1 %[temp9], 16(%[dst]) \n\t" /*dst[i+4] = src[i+4] * mul;*/
116  "swc1 %[temp11], 20(%[dst]) \n\t" /*dst[i+5] = src[i+5] * mul;*/
117  "swc1 %[temp13], 24(%[dst]) \n\t" /*dst[i+6] = src[i+6] * mul;*/
118  "swc1 %[temp15], 28(%[dst]) \n\t" /*dst[i+7] = src[i+7] * mul;*/
119  PTR_ADDIU "%[dst], 32 \n\t"
120  "bne %[src], %[src_end], i32tf_lp%= \n\t"
121  : [temp1]"=&f"(temp1), [temp11]"=&f"(temp11),
122  [temp13]"=&f"(temp13), [temp15]"=&f"(temp15),
123  [temp3]"=&f"(temp3), [temp5]"=&f"(temp5),
124  [temp7]"=&f"(temp7), [temp9]"=&f"(temp9),
125  [rpom1]"=&r"(rpom1), [rpom2]"=&r"(rpom2),
126  [rpom11]"=&r"(rpom11), [rpom21]"=&r"(rpom21),
127  [rpom12]"=&r"(rpom12), [rpom22]"=&r"(rpom22),
128  [rpom13]"=&r"(rpom13), [rpom23]"=&r"(rpom23),
129  [dst]"+r"(dst), [src]"+r"(src)
130  : [mul]"f"(mul), [src_end]"r"(src_end)
131  : "memory"
132  );
133 }
134 #endif /* HAVE_INLINE_ASM */
135 
137 {
138 #if HAVE_INLINE_ASM
139  c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_mips;
140 #endif
141 }