1 /* Copyright (C) 2004 Jean-Marc Valin */ 2 /** 3 @file fixed_arm4.h 4 @brief ARM4 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_ARM4_H 36 #define FIXED_ARM4_H 37 38 #undef MULT16_32_Q14 39 static inline spx_word32_t MULT16_32_Q14(spx_word16_t x, spx_word32_t y) { 40 int res; 41 int dummy; 42 asm ( 43 "smull %0,%1,%2,%3 \n\t" 44 "mov %0, %0, lsr #14 \n\t" 45 "add %0, %0, %1, lsl #18 \n\t" 46 : "=&r"(res), "=&r" (dummy) 47 : "r"(y),"r"((int)x)); 48 return(res); 49 } 50 51 #undef MULT16_32_Q15 52 static inline spx_word32_t MULT16_32_Q15(spx_word16_t x, spx_word32_t y) { 53 int res; 54 int dummy; 55 asm ( 56 "smull %0,%1,%2,%3 \n\t" 57 "mov %0, %0, lsr #15 \n\t" 58 "add %0, %0, %1, lsl #17 \n\t" 59 : "=&r"(res), "=&r" (dummy) 60 : "r"(y),"r"((int)x)); 61 return(res); 62 } 63 64 #undef DIV32_16 65 static inline short DIV32_16(int a, int b) 66 { 67 int res=0; 68 int dead1, dead2, dead3, dead4, dead5; 69 __asm__ __volatile__ ( 70 "\teor %5, %0, %1\n" 71 "\tmovs %4, %0\n" 72 "\trsbmi %0, %0, #0 \n" 73 "\tmovs %4, %1\n" 74 "\trsbmi %1, %1, #0 \n" 75 "\tmov %4, #1\n" 76 77 "\tsubs %3, %0, %1, asl #14 \n" 78 "\tmovpl %0, %3 \n" 79 "\torrpl %2, %2, %4, asl #14 \n" 80 81 "\tsubs %3, %0, %1, asl #13 \n" 82 "\tmovpl %0, %3 \n" 83 "\torrpl %2, %2, %4, asl #13 \n" 84 85 "\tsubs %3, %0, %1, asl #12 \n" 86 "\tmovpl %0, %3 \n" 87 "\torrpl %2, %2, %4, asl #12 \n" 88 89 "\tsubs %3, %0, %1, asl #11 \n" 90 "\tmovpl %0, %3 \n" 91 "\torrpl %2, %2, %4, asl #11 \n" 92 93 "\tsubs %3, %0, %1, asl #10 \n" 94 "\tmovpl %0, %3 \n" 95 "\torrpl %2, %2, %4, asl #10 \n" 96 97 "\tsubs %3, %0, %1, asl #9 \n" 98 "\tmovpl %0, %3 \n" 99 "\torrpl %2, %2, %4, asl #9 \n" 100 101 "\tsubs %3, %0, %1, asl #8 \n" 102 "\tmovpl %0, %3 \n" 103 "\torrpl %2, %2, %4, asl #8 \n" 104 105 "\tsubs %3, %0, %1, asl #7 \n" 106 "\tmovpl %0, %3 \n" 107 "\torrpl %2, %2, %4, asl #7 \n" 108 109 "\tsubs %3, %0, %1, asl #6 \n" 110 "\tmovpl %0, %3 \n" 111 "\torrpl %2, %2, %4, asl #6 \n" 112 113 "\tsubs %3, %0, %1, asl #5 \n" 114 "\tmovpl %0, %3 \n" 115 "\torrpl %2, %2, %4, asl #5 \n" 116 117 "\tsubs %3, %0, %1, asl #4 \n" 118 "\tmovpl %0, %3 \n" 119 "\torrpl %2, %2, %4, asl #4 \n" 120 121 "\tsubs %3, %0, %1, asl #3 \n" 122 "\tmovpl %0, %3 \n" 123 "\torrpl %2, %2, %4, asl #3 \n" 124 125 "\tsubs %3, %0, %1, asl #2 \n" 126 "\tmovpl %0, %3 \n" 127 "\torrpl %2, %2, %4, asl #2 \n" 128 129 "\tsubs %3, %0, %1, asl #1 \n" 130 "\tmovpl %0, %3 \n" 131 "\torrpl %2, %2, %4, asl #1 \n" 132 133 "\tsubs %3, %0, %1 \n" 134 "\tmovpl %0, %3 \n" 135 "\torrpl %2, %2, %4 \n" 136 137 "\tmovs %5, %5, lsr #31 \n" 138 "\trsbne %2, %2, #0 \n" 139 : "=r" (dead1), "=r" (dead2), "=r" (res), 140 "=r" (dead3), "=r" (dead4), "=r" (dead5) 141 : "0" (a), "1" (b), "2" (res) 142 : "cc" 143 ); 144 return res; 145 } 146 147 148 #endif 149
