path: root/audio_codec/libcook/assembly.h (plain)
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1	/* ***** BEGIN LICENSE BLOCK *****
2	* Source last modified: $Id: assembly.h,v 1.13 2005/04/27 19:20:50 hubbe Exp $
3	*
4	* REALNETWORKS CONFIDENTIAL--NOT FOR DISTRIBUTION IN SOURCE CODE FORM
5	* Portions Copyright (c) 1995-2002 RealNetworks, Inc.
6	* All Rights Reserved.
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8	* The contents of this file, and the files included with this file,
9	* are subject to the current version of the Real Format Source Code
10	* Porting and Optimization License, available at
11	* https://helixcommunity.org/2005/license/realformatsource (unless
12	* RealNetworks otherwise expressly agrees in writing that you are
13	* subject to a different license). You may also obtain the license
14	* terms directly from RealNetworks. You may not use this file except
15	* in compliance with the Real Format Source Code Porting and
16	* Optimization License. There are no redistribution rights for the
17	* source code of this file. Please see the Real Format Source Code
18	* Porting and Optimization License for the rights, obligations and
19	* limitations governing use of the contents of the file.
20	*
21	* RealNetworks is the developer of the Original Code and owns the
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33	*
34	* Contributor(s):
35	*
36	* ***** END LICENSE BLOCK ***** */
37
38	/**************************************************************************************
39	* Fixed-point RealAudio 8 decoder
40	* Jon Recker (jrecker@real.com), Ken Cooke (kenc@real.com)
41	* October 2003
42	*
43	* assembly.h - inline assembly language functions and prototypes
44	*
45	* MULSHIFT32(x, y) signed multiply of two 32-bit integers (x and y),
46	* returns top 32-bits of 64-bit result
47	* CLIPTOSHORT(x) convert 32-bit integer to 16-bit short,
48	* clipping to [-32768, 32767]
49	* FASTABS(x) branchless absolute value of signed integer x
50	* CLZ(x) count leading zeros on signed integer x
51	**************************************************************************************/
52
53	#ifndef _ASSEMBLY_H
54	#define _ASSEMBLY_H
55
56	#include "coder.h"
57
58	/* toolchain: ARM gcc
59	* target architecture: ARM v.4 and above (requires 'M' type processor for 32x32->64 multiplier)
60	*/
61
62	#if defined(__aarch64__)
63	static __inline__ int MULSHIFT32(int x, int y)
64	{
65	long c;
66	c = (long)x * y;
67	return (int)c;
68	}
69	#else
70	static __inline__ int MULSHIFT32(int x, int y)
71	{
72	int zlow;
73	__asm__ volatile("smull %0,%1,%2,%3" : "=&r"(zlow), "=r"(y) : "r"(x), "1"(y));
74	return y;
75	}
76	#endif
77	static __inline short CLIPTOSHORT(int x)
78	{
79	int sign;
80
81	/* clip to [-32768, 32767] */
82	sign = x >> 31;
83	if (sign != (x >> 15)) {
84	x = sign ^((1 << 15) - 1);
85	}
86
87	return (short)x;
88	}
89
90	static __inline int FASTABS(int x)
91	{
92	int sign;
93
94	sign = x >> (sizeof(int) * 8 - 1);
95	x ^= sign;
96	x -= sign;
97
98	return x;
99	}
100
101	static __inline int CLZ(int x)
102	{
103	int numZeros;
104
105	if (!x) {
106	return (sizeof(int) * 8);
107	}
108
109	numZeros = 0;
110	while (!(x & 0x80000000)) {
111	numZeros++;
112	x <<= 1;
113	}
114
115	return numZeros;
116	}
117
118
119	#endif /* _ASSEMBLY_H */
120