1 /* Copyright (C) 2003 Jean-Marc Valin */ 2 /** 3 @file fixed_generic.h 4 @brief Generic fixed-point operations 5 */ 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 11 - Redistributions of source code must retain the above copyright 12 notice, this list of conditions and the following disclaimer. 13 14 - Redistributions in binary form must reproduce the above copyright 15 notice, this list of conditions and the following disclaimer in the 16 documentation and/or other materials provided with the distribution. 17 18 - Neither the name of the Xiph.org Foundation nor the names of its 19 contributors may be used to endorse or promote products derived from 20 this software without specific prior written permission. 21 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #ifndef FIXED_GENERIC_H 36 #define FIXED_GENERIC_H 37 38 #define QCONST16(x,bits) ((spx_word16_t)(.5+(x)*(((spx_word32_t)1)<<(bits)))) 39 #define QCONST32(x,bits) ((spx_word32_t)(.5+(x)*(((spx_word32_t)1)<<(bits)))) 40 41 #define NEG16(x) (-(x)) 42 #define NEG32(x) (-(x)) 43 #define EXTRACT16(x) ((spx_word16_t)(x)) 44 #define EXTEND32(x) ((spx_word32_t)(x)) 45 #define SHR16(a,shift) ((a) >> (shift)) 46 #define SHL16(a,shift) ((a) << (shift)) 47 #define SHR32(a,shift) ((a) >> (shift)) 48 #define SHL32(a,shift) ((a) << (shift)) 49 #define PSHR16(a,shift) (SHR16((a)+((1<<((shift))>>1)),shift)) 50 #define PSHR32(a,shift) (SHR32((a)+((EXTEND32(1)<<((shift))>>1)),shift)) 51 #define VSHR32(a, shift) (((shift)>0) ? SHR32(a, shift) : SHL32(a, -(shift))) 52 #define SATURATE16(x,a) (((x)>(a) ? (a) : (x)<-(a) ? -(a) : (x))) 53 #define SATURATE32(x,a) (((x)>(a) ? (a) : (x)<-(a) ? -(a) : (x))) 54 55 #define SATURATE32PSHR(x,shift,a) (((x)>=(SHL32(a,shift))) ? (a) : \ 56 (x)<=-(SHL32(a,shift)) ? -(a) : \ 57 (PSHR32(x, shift))) 58 59 #define SHR(a,shift) ((a) >> (shift)) 60 #define SHL(a,shift) ((spx_word32_t)(a) << (shift)) 61 #define PSHR(a,shift) (SHR((a)+((EXTEND32(1)<<((shift))>>1)),shift)) 62 #define SATURATE(x,a) (((x)>(a) ? (a) : (x)<-(a) ? -(a) : (x))) 63 64 65 #define ADD16(a,b) ((spx_word16_t)((spx_word16_t)(a)+(spx_word16_t)(b))) 66 #define SUB16(a,b) ((spx_word16_t)(a)-(spx_word16_t)(b)) 67 #define ADD32(a,b) ((spx_word32_t)(a)+(spx_word32_t)(b)) 68 #define SUB32(a,b) ((spx_word32_t)(a)-(spx_word32_t)(b)) 69 70 71 /* result fits in 16 bits */ 72 #define MULT16_16_16(a,b) ((((spx_word16_t)(a))*((spx_word16_t)(b)))) 73 74 /* (spx_word32_t)(spx_word16_t) gives TI compiler a hint that it's 16x16->32 multiply */ 75 #define MULT16_16(a,b) (((spx_word32_t)(spx_word16_t)(a))*((spx_word32_t)(spx_word16_t)(b))) 76 77 #define MAC16_16(c,a,b) (ADD32((c),MULT16_16((a),(b)))) 78 #define MULT16_32_Q12(a,b) ADD32(MULT16_16((a),SHR((b),12)), SHR(MULT16_16((a),((b)&0x00000fff)),12)) 79 #define MULT16_32_Q13(a,b) ADD32(MULT16_16((a),SHR((b),13)), SHR(MULT16_16((a),((b)&0x00001fff)),13)) 80 #define MULT16_32_Q14(a,b) ADD32(MULT16_16((a),SHR((b),14)), SHR(MULT16_16((a),((b)&0x00003fff)),14)) 81 82 #define MULT16_32_Q11(a,b) ADD32(MULT16_16((a),SHR((b),11)), SHR(MULT16_16((a),((b)&0x000007ff)),11)) 83 #define MAC16_32_Q11(c,a,b) ADD32(c,ADD32(MULT16_16((a),SHR((b),11)), SHR(MULT16_16((a),((b)&0x000007ff)),11))) 84 85 #define MULT16_32_P15(a,b) ADD32(MULT16_16((a),SHR((b),15)), PSHR(MULT16_16((a),((b)&0x00007fff)),15)) 86 #define MULT16_32_Q15(a,b) ADD32(MULT16_16((a),SHR((b),15)), SHR(MULT16_16((a),((b)&0x00007fff)),15)) 87 #define MAC16_32_Q15(c,a,b) ADD32(c,ADD32(MULT16_16((a),SHR((b),15)), SHR(MULT16_16((a),((b)&0x00007fff)),15))) 88 89 90 #define MAC16_16_Q11(c,a,b) (ADD32((c),SHR(MULT16_16((a),(b)),11))) 91 #define MAC16_16_Q13(c,a,b) (ADD32((c),SHR(MULT16_16((a),(b)),13))) 92 #define MAC16_16_P13(c,a,b) (ADD32((c),SHR(ADD32(4096,MULT16_16((a),(b))),13))) 93 94 #define MULT16_16_Q11_32(a,b) (SHR(MULT16_16((a),(b)),11)) 95 #define MULT16_16_Q13(a,b) (SHR(MULT16_16((a),(b)),13)) 96 #define MULT16_16_Q14(a,b) (SHR(MULT16_16((a),(b)),14)) 97 #define MULT16_16_Q15(a,b) (SHR(MULT16_16((a),(b)),15)) 98 99 #define MULT16_16_P13(a,b) (SHR(ADD32(4096,MULT16_16((a),(b))),13)) 100 #define MULT16_16_P14(a,b) (SHR(ADD32(8192,MULT16_16((a),(b))),14)) 101 #define MULT16_16_P15(a,b) (SHR(ADD32(16384,MULT16_16((a),(b))),15)) 102 103 #define MUL_16_32_R15(a,bh,bl) ADD32(MULT16_16((a),(bh)), SHR(MULT16_16((a),(bl)),15)) 104 105 #define DIV32_16(a,b) ((spx_word16_t)(((spx_word32_t)(a))/((spx_word16_t)(b)))) 106 #define PDIV32_16(a,b) ((spx_word16_t)(((spx_word32_t)(a)+((spx_word16_t)(b)>>1))/((spx_word16_t)(b)))) 107 #define DIV32(a,b) (((spx_word32_t)(a))/((spx_word32_t)(b))) 108 #define PDIV32(a,b) (((spx_word32_t)(a)+((spx_word16_t)(b)>>1))/((spx_word32_t)(b))) 109 110 #endif 111
