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fixed_arm.h

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00001 /* Copyright (C) 2003 Jean-Marc Valin */
00006 /*
00007    Redistribution and use in source and binary forms, with or without
00008    modification, are permitted provided that the following conditions
00009    are met:
00010    
00011    - Redistributions of source code must retain the above copyright
00012    notice, this list of conditions and the following disclaimer.
00013    
00014    - Redistributions in binary form must reproduce the above copyright
00015    notice, this list of conditions and the following disclaimer in the
00016    documentation and/or other materials provided with the distribution.
00017    
00018    - Neither the name of the Xiph.org Foundation nor the names of its
00019    contributors may be used to endorse or promote products derived from
00020    this software without specific prior written permission.
00021    
00022    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00023    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00024    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00025    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
00026    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00027    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00028    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00029    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00030    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00031    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00032    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00033 */
00034 
00035 #ifndef FIXED_ARM_H
00036 #define FIXED_ARM_H
00037 
00038 #define SHR(a,shift) ((a) >> (shift))
00039 #define SHL(a,shift) ((a) << (shift))
00040 
00041 #define SATURATE(x,a) ((x)>(a) ? (a) : (x)<-(a) ? -(a) : (x))
00042 
00043 
00044 #define ADD16(a,b) ((short)((short)(a)+(short)(b)))
00045 #define SUB16(a,b) ((a)-(b))
00046 #define ADD32(a,b) ((a)+(b))
00047 #define SUB32(a,b) ((a)-(b))
00048 #define ADD64(a,b) ((a)+(b))
00049 
00050 #define PSHR(a,shift) (SHR((a)+(1<<((shift)-1)),shift))
00051 
00052 /* result fits in 16 bits */
00053 #define MULT16_16_16(a,b)     (((short)(a))*((short)(b)))
00054 
00055 static inline spx_word32_t MULT16_16(spx_word16_t x, spx_word16_t y) {
00056   int res;
00057   asm ("smulbb  %0,%1,%2;\n"
00058               : "=&r"(res)
00059               : "%r"(x),"r"(y));
00060   return(res);
00061 }
00062 
00063 static inline spx_word32_t MAC16_16(spx_word32_t a, spx_word16_t x, spx_word32_t y) {
00064   int res;
00065   asm ("smlabb  %0,%1,%2,%3;\n"
00066               : "=&r"(res)
00067                : "%r"(x),"r"(y),"r"(a));
00068   return(res);
00069 }
00070 
00071 #define MULT16_32_Q12(a,b) ADD32(MULT16_16((a),SHR((b),12)), SHR(MULT16_16((a),((b)&0x00000fff)),12))
00072 #define MULT16_32_Q13(a,b) ADD32(MULT16_16((a),SHR((b),13)), SHR(MULT16_16((a),((b)&0x00001fff)),13))
00073 #define MULT16_32_Q14(a,b) ADD32(MULT16_16((a),SHR((b),14)), SHR(MULT16_16((a),((b)&0x00003fff)),14))
00074 
00075 static inline spx_word32_t MULT16_32_Q15(spx_word16_t x, spx_word32_t y) {
00076   int res;
00077   asm ("smulwb  %0,%1,%2;\n"
00078               : "=&r"(res)
00079                : "%r"(y<<1),"r"(x));
00080   return(res);
00081 }
00082 static inline spx_word32_t MAC16_32_Q15(spx_word32_t a, spx_word16_t x, spx_word32_t y) {
00083   int res;
00084   asm ("smlawb  %0,%1,%2,%3;\n"
00085               : "=&r"(res)
00086                : "%r"(y<<1),"r"(x),"r"(a));
00087   return(res);
00088 }
00089 static inline spx_word32_t MULT16_32_Q11(spx_word16_t x, spx_word32_t y) {
00090   int res;
00091   asm ("smulwb  %0,%1,%2;\n"
00092               : "=&r"(res)
00093                : "%r"(y<<5),"r"(x));
00094   return(res);
00095 }
00096 static inline spx_word32_t MAC16_32_Q11(spx_word32_t a, spx_word16_t x, spx_word32_t y) {
00097   int res;
00098   asm ("smlawb  %0,%1,%2,%3;\n"
00099               : "=&r"(res)
00100                : "%r"(y<<5),"r"(x),"r"(a));
00101   return(res);
00102 }
00103 
00104 #define MAC16_16_Q11(c,a,b)     (ADD32((c),SHR(MULT16_16((a),(b)),11)))
00105 
00106 #define MULT16_16_Q11(a,b) (SHR(MULT16_16((a),(b)),11))
00107 #define MULT16_16_Q13(a,b) (SHR(MULT16_16((a),(b)),13))
00108 #define MULT16_16_Q14(a,b) (SHR(MULT16_16((a),(b)),14))
00109 #define MULT16_16_Q15(a,b) (SHR(MULT16_16((a),(b)),15))
00110 
00111 #define MULT16_16_P13(a,b) (SHR(ADD32(4096,MULT16_16((a),(b))),13))
00112 #define MULT16_16_P14(a,b) (SHR(ADD32(8192,MULT16_16((a),(b))),14))
00113 #define MULT16_16_P15(a,b) (SHR(ADD32(16384,MULT16_16((a),(b))),15))
00114 
00115 #define MUL_16_32_R15(a,bh,bl) ADD32(MULT16_16((a),(bh)), SHR(MULT16_16((a),(bl)),15))
00116 
00117 
00118 
00119 #define DIV32_16(a,b) ((short)(((signed int)(a))/((short)(b))))
00120 #define DIV32(a,b) (((signed int)(a))/((signed int)(b)))
00121 
00122 
00123 
00124 #endif

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