1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 /* This header file includes the inline functions for ARM processors in 13 * the fix point signal processing library. 14 */ 15 16 #ifndef WEBRTC_SPL_SPL_INL_ARMV7_H_ 17 #define WEBRTC_SPL_SPL_INL_ARMV7_H_ 18 19 /* TODO(kma): Replace some assembly code with GCC intrinsics 20 * (e.g. __builtin_clz). 21 */ 22 23 /* This function produces result that is not bit exact with that by the generic 24 * C version in some cases, although the former is at least as accurate as the 25 * later. 26 */ 27 static __inline int32_t WEBRTC_SPL_MUL_16_32_RSFT16(int16_t a, int32_t b) { 28 int32_t tmp = 0; 29 __asm __volatile ("smulwb %0, %1, %2":"=r"(tmp):"r"(b), "r"(a)); 30 return tmp; 31 } 32 33 static __inline int32_t WEBRTC_SPL_MUL_16_16(int16_t a, int16_t b) { 34 int32_t tmp = 0; 35 __asm __volatile ("smulbb %0, %1, %2":"=r"(tmp):"r"(a), "r"(b)); 36 return tmp; 37 } 38 39 // TODO(kma): add unit test. 40 static __inline int32_t WebRtc_MulAccumW16(int16_t a, int16_t b, int32_t c) { 41 int32_t tmp = 0; 42 __asm __volatile ("smlabb %0, %1, %2, %3":"=r"(tmp):"r"(a), "r"(b), "r"(c)); 43 return tmp; 44 } 45 46 static __inline int16_t WebRtcSpl_AddSatW16(int16_t a, int16_t b) { 47 int32_t s_sum = 0; 48 49 __asm __volatile ("qadd16 %0, %1, %2":"=r"(s_sum):"r"(a), "r"(b)); 50 51 return (int16_t) s_sum; 52 } 53 54 static __inline int32_t WebRtcSpl_AddSatW32(int32_t l_var1, int32_t l_var2) { 55 int32_t l_sum = 0; 56 57 __asm __volatile ("qadd %0, %1, %2":"=r"(l_sum):"r"(l_var1), "r"(l_var2)); 58 59 return l_sum; 60 } 61 62 static __inline int32_t WebRtcSpl_SubSatW32(int32_t l_var1, int32_t l_var2) { 63 int32_t l_sub = 0; 64 65 __asm __volatile ("qsub %0, %1, %2":"=r"(l_sub):"r"(l_var1), "r"(l_var2)); 66 67 return l_sub; 68 } 69 70 static __inline int16_t WebRtcSpl_SubSatW16(int16_t var1, int16_t var2) { 71 int32_t s_sub = 0; 72 73 __asm __volatile ("qsub16 %0, %1, %2":"=r"(s_sub):"r"(var1), "r"(var2)); 74 75 return (int16_t)s_sub; 76 } 77 78 static __inline int16_t WebRtcSpl_GetSizeInBits(uint32_t n) { 79 int32_t tmp = 0; 80 81 __asm __volatile ("clz %0, %1":"=r"(tmp):"r"(n)); 82 83 return (int16_t)(32 - tmp); 84 } 85 86 static __inline int16_t WebRtcSpl_NormW32(int32_t a) { 87 int32_t tmp = 0; 88 89 if (a == 0) { 90 return 0; 91 } 92 else if (a < 0) { 93 a ^= 0xFFFFFFFF; 94 } 95 96 __asm __volatile ("clz %0, %1":"=r"(tmp):"r"(a)); 97 98 return (int16_t)(tmp - 1); 99 } 100 101 static __inline int16_t WebRtcSpl_NormU32(uint32_t a) { 102 int tmp = 0; 103 104 if (a == 0) return 0; 105 106 __asm __volatile ("clz %0, %1":"=r"(tmp):"r"(a)); 107 108 return (int16_t)tmp; 109 } 110 111 static __inline int16_t WebRtcSpl_NormW16(int16_t a) { 112 int32_t tmp = 0; 113 int32_t a_32 = a; 114 115 if (a_32 == 0) { 116 return 0; 117 } 118 else if (a_32 < 0) { 119 a_32 ^= 0xFFFFFFFF; 120 } 121 122 __asm __volatile ("clz %0, %1":"=r"(tmp):"r"(a_32)); 123 124 return (int16_t)(tmp - 17); 125 } 126 127 // TODO(kma): add unit test. 128 static __inline int16_t WebRtcSpl_SatW32ToW16(int32_t value32) { 129 int32_t out = 0; 130 131 __asm __volatile ("ssat %0, #16, %1" : "=r"(out) : "r"(value32)); 132 133 return (int16_t)out; 134 } 135 136 #endif // WEBRTC_SPL_SPL_INL_ARMV7_H_ 137
