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00041 #ifndef _FIXPOINT_H_
00042 #define _FIXPOINT_H_
00043
00044
00045 #include <sphinxbase_export.h>
00046 #include <prim_type.h>
00047 #include <limits.h>
00048
00049
00050 #ifdef __cplusplus
00051 extern "C" {
00052 #endif
00053 #if 0
00054
00055 }
00056 #endif
00057
00058 #define DEFAULT_RADIX (12)
00059
00061 typedef int32 fixed32;
00062
00064 #define FLOAT2FIX_ANY(x,radix) \
00065 (((x)<0.0) ? \
00066 ((fixed32)((x)*(float32)(1<<(radix)) - 0.5)) \
00067 : ((fixed32)((x)*(float32)(1<<(radix)) + 0.5)))
00068 #define FLOAT2FIX(x) FLOAT2FIX_ANY(x,DEFAULT_RADIX)
00069
00070 #define FIX2FLOAT_ANY(x,radix) ((float32)(x)/(1<<(radix)))
00071 #define FIX2FLOAT(x) FIX2FLOAT_ANY(x,DEFAULT_RADIX)
00072
00079 #if defined(__arm__)
00080 #define FIXMUL(a,b) FIXMUL_ANY(a,b,DEFAULT_RADIX)
00081 #define FIXMUL_ANY(a,b,r) ({ \
00082 int cl, ch, _a = a, _b = b; \
00083 asm ("smull %0, %1, %2, %3\n" \
00084 "mov %0, %0, lsr %4\n" \
00085 "orr %0, %0, %1, lsl %5\n" \
00086 : "=&r" (cl), "=&r" (ch) \
00087 : "r" (_a), "r" (_b), "i" (r), "i" (32-(r)));\
00088 cl; })
00089 #elif defined(BFIN) && DEFAULT_RADIX == 16
00090
00091 #undef FIXMUL
00092
00093 #define FIXMUL(a,b) ({ \
00094 int c, _a = a, _b = b; \
00095 asm("%0.L = %1.l * %2.l (FU);\n\t" \
00096 "%0.H = %1.h * %2.h (IS);\n\t" \
00097 "A1 = %0;\n\t" \
00098 "A1 += %1.h * %2.l (IS, M);\n\t" \
00099 "%0 = (A1 += %2.h * %1.l) (IS, M);\n\t" \
00100 : "=&W" (c) \
00101 : "d" (_a), "d" (_b) \
00102 : "A1", "cc"); \
00103 c; })
00104 #define FIXMUL_ANY(a,b,radix) ((fixed32)(((int64)(a)*(b))>>(radix)))
00105 #elif defined(_MSC_VER) || (defined(HAVE_LONG_LONG) && SIZEOF_LONG_LONG == 8)
00106 #define FIXMUL(a,b) FIXMUL_ANY(a,b,DEFAULT_RADIX)
00107 #define FIXMUL_ANY(a,b,radix) ((fixed32)(((int64)(a)*(b))>>(radix)))
00108 #else
00109 #define FIXMUL(a,b) FIXMUL_ANY(a,b,DEFAULT_RADIX)
00110 #define FIXMUL_ANY(a,b,radix) \
00111 (fixed32)(((((uint32)(a))&((1<<(radix))-1)) \
00112 * (((uint32)(b))&((1<<(radix))-1)) >> (radix)) \
00113 + (((((int32)(a))>>(radix)) * (((int32)(b))>>(radix))) << (radix)) \
00114 + ((((uint32)(a))&((1<<(radix))-1)) * (((int32)(b))>>(radix))) \
00115 + ((((uint32)(b))&((1<<(radix))-1)) * (((int32)(a))>>(radix))))
00116 #endif
00117
00118
00120 #define MIN_FIXLOG -2829416
00121 #define MIN_FIXLOG2 -4081985
00122
00123 #define FIXLN_2 ((fixed32)(0.693147180559945 * (1<<DEFAULT_RADIX)))
00124
00125 #define FIXLN(x) (fixlog(x) - (FIXLN_2 * DEFAULT_RADIX))
00126
00130 int32 fixlog(uint32 x);
00135 int32 fixlog2(uint32 x);
00136
00137 #ifdef __cplusplus
00138 }
00139 #endif
00140
00141
00142 #endif