3 /********************************************************************
5 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
6 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
7 * THE GNU LESSER/LIBRARY PUBLIC LICENSE, WHICH IS INCLUDED WITH *
8 * THIS SOURCE. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
10 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
11 * by Monty <monty@xiph.org> and the XIPHOPHORUS Company *
12 * http://www.xiph.org/ *
14 ********************************************************************
16 function: #ifdef jail to whip a few platforms into the UNIX ideal.
17 last mod: $Id: os.h,v 1.21 2001/02/01 01:03:29 xiphmont Exp $
19 ********************************************************************/
22 #include <ogg/os_types.h>
24 #ifndef _V_IFDEFJAIL_H_
25 # define _V_IFDEFJAIL_H_
28 # define STIN static inline
30 # define STIN static __inline
36 # define M_PI (3.1415926536f)
41 # define rint(x) (floor((x)+0.5f))
42 # define NO_FLOAT_MATH_LIB
43 # define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
47 # define NO_FLOAT_MATH_LIB
50 #ifndef NO_FLOAT_MATH_LIB
63 # define FAST_HYPOT hypot
77 # define min(x,y) ((x)>(y)?(y):(x))
81 # define max(x,y) ((x)<(y)?(y):(x))
84 #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
85 # define VORBIS_FPU_CONTROL
86 /* both GCC and MSVC are kinda stupid about rounding/casting to int.
87 Because of encapsulation constraints (GCC can't see inside the asm
88 block and so we end up doing stupid things like a store/load that
89 is collectively a noop), we do it this way */
91 /* we must set up the fpu before this works!! */
93 typedef ogg_int16_t vorbis_fpu_control;
95 static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
98 __asm__ __volatile__("fnstcw %0\n\t"
100 "orw $62463,%%dx\n\t"
102 "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
106 static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
107 __asm__ __volatile__("fldcw %0":: "m"(fpu));
110 /* assumes the FPU is in round mode! */
111 static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
112 we get extra fst/fld to
113 truncate precision */
115 __asm__("fistl %0": "=m"(i) : "t"(f));
121 #if defined(_WIN32) && !defined(__GNUC__)
122 # define VORBIS_FPU_CONTROL
124 typedef ogg_int16_t vorbis_fpu_control;
126 static __inline int vorbis_ftoi(double f){
135 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
138 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
144 #ifndef VORBIS_FPU_CONTROL
146 typedef int vorbis_fpu_control;
148 static int vorbis_ftoi(double f){
152 /* We don't have special code for this compiler/arch, so do it the slow way */
153 # define vorbis_fpu_setround(vorbis_fpu_control) {}
154 # define vorbis_fpu_restore(vorbis_fpu_control) {}