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annotate sconv_neon.c @ 1:b829afbea564

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author Peter Meerwald <p.meerwald@bct-electronic.com>
date Fri, 20 Apr 2012 14:26:14 +0200
parents e0040ee59c3c
children e889fd0e7769
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Peter Meerwald <p.meerwald@bct-electronic.com>
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1 /*
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2 * Copyright 2012 Peter Meerwald <p.meerwald@bct-electronic.com>
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3 */
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4
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5 #include <stdlib.h>
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6 #include <stdio.h>
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7 #include <stdarg.h>
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8 #include <string.h>
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9 #include <math.h>
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10 #include <sys/time.h>
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11 #include <assert.h>
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12
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13 typedef short int16_t;
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14 typedef void (*pa_convert_func_t)(unsigned n, const void *a, void *b);
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15 typedef long long unsigned int pa_usec_t;
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16
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17 #define pa_assert(x) assert(x)
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18
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19 #define PA_CLAMP_UNLIKELY(x, low, high) \
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20 (((x) < (low)) ? (low) : (((x) > (high)) ? (high) : (x)))
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21
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22 static void pa_log_info(const char *format, ...) {
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23 va_list ap;
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24 char buf[1024];
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25 va_start(ap, format);
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26 vsprintf(buf, format, ap);
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27 printf("%s\n", buf);
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28 va_end(ap);
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29 }
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30
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31 #define pa_log_debug pa_log_info
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32
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33 static pa_usec_t pa_rtclock_now() {
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34 struct timeval tv;
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35 gettimeofday(&tv, NULL);
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36
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37 return tv.tv_sec * 1000000ULL + tv.tv_usec;
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38 }
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39
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40 #if defined(__arm__)
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41
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42 #include "arm_neon.h"
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43
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44 void pa_sconv_s16le_from_float32ne(unsigned n, const float *a, int16_t *b) {
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45 pa_assert(a);
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46 pa_assert(b);
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47
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48 for (; n > 0; n--) {
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49 float v = *(a++);
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50
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51 v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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52 *(b++) = (int16_t) lrintf(v * 0x7FFF);
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53 }
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54 }
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55
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56 void pa_sconv_s16le_from_f32ne_neon(unsigned n, const float *a, int16_t *b) {
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57 unsigned i;
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58
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59 const float32x4_t plusone4 = vdupq_n_f32(1.0f);
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60 const float32x4_t minusone4 = vdupq_n_f32(-1.0f);
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61 const float32x4_t half4 = vdupq_n_f32(0.5f);
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62 const float32x4_t scale4 = vdupq_n_f32(32767.0f);
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63 const uint32x4_t mask4 = vdupq_n_u32(0x80000000);
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64
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65 for (i = 0; i < n/4; i++) {
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66 float32x4_t v4 = ((float32x4_t *)a)[i];
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67 v4 = vmulq_f32(vmaxq_f32(vminq_f32(v4, plusone4) , minusone4), scale4);
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68
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69 const float32x4_t w4 = vreinterpretq_f32_u32(vorrq_u32(vandq_u32(
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70 vreinterpretq_u32_f32(v4), mask4), vreinterpretq_u32_f32(half4)));
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71
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72 ((int16x4_t *)b)[i] = vmovn_s32(vcvtq_s32_f32(vaddq_f32(v4, w4)));
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73 }
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74
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75 // leftovers
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76 for (i = n & ~3; i < n; i++) {
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77 b[i] = (int16_t) lrintf(PA_CLAMP_UNLIKELY(a[i], -1.0f, 1.0f) * 0x7FFF);
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78 }
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79 }
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80
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81 void pa_sconv_s16le_to_float32ne(unsigned n, const int16_t *a, float *b) {
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82 pa_assert(a);
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83 pa_assert(b);
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84
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85 for (; n > 0; n--)
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86 *(b++) = ((float) (*(a++)))/(float) 0x7FFF;
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87 }
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88
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89 void pa_sconv_s16le_to_f32ne_neon(unsigned n, const int16_t *a, float *b) {
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90 unsigned i;
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91
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92 const float32x4_t invscale4 = vdupq_n_f32(1.0f / 0x7FFF);
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93
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94 for (i = 0; i < n/4; i++) {
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95 ((float32x4_t *)b)[i] = vmulq_f32(vcvtq_f32_s32(vmovl_s16(((int16x4_t *)a)[i])), invscale4);
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96 }
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97
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98 // leftovers
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99 const float invscale = 1.0f / 0x7FFF;
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100 for (i = n & ~3; i < n; i++) {
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101 b[i] = a[i] * invscale;
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102 }
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103 }
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104
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105 #define SAMPLES 1019
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106 #define TIMES 10000
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107
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108 static void run_test_from(void) {
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109 int16_t samples[SAMPLES];
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110 int16_t samples_ref[SAMPLES];
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111 float floats[SAMPLES];
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112 int i;
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113 pa_usec_t start, stop;
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114 pa_convert_func_t func;
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115
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116 pa_log_debug("checking NEON sconv_s16le_from_float(%d)", SAMPLES);
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117
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118 memset(samples_ref, 0, sizeof(samples_ref));
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119 memset(samples, 0, sizeof(samples));
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120
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121 for (i = 0; i < SAMPLES; i++) {
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122 floats[i] = 2.1f * (rand()/(float) RAND_MAX - 0.5f);
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123 }
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124
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125 func = (pa_convert_func_t) pa_sconv_s16le_from_float32ne;
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126 func(SAMPLES, floats, samples_ref);
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127 pa_sconv_s16le_from_f32ne_neon(SAMPLES, floats, samples);
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128
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129 for (i = 0; i < SAMPLES; i++) {
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130 if (abs(samples[i] - samples_ref[i]) > 0) {
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131 pa_log_debug("%d: %d != %d (%f)", i, samples[i], samples_ref[i],
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132 floats[i]);
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133 }
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134 }
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135
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136 start = pa_rtclock_now();
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137 for (i = 0; i < TIMES; i++) {
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138 pa_sconv_s16le_from_f32ne_neon(SAMPLES, floats, samples);
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139 }
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140 stop = pa_rtclock_now();
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141 pa_log_info("NEON: %llu usec.", (long long unsigned int)(stop - start));
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142
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143 start = pa_rtclock_now();
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144 for (i = 0; i < TIMES; i++) {
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145 func(SAMPLES, floats, samples_ref);
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146 }
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147 stop = pa_rtclock_now();
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148 pa_log_info("ref: %llu usec.", (long long unsigned int)(stop - start));
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149 }
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150
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151 static void run_test_to(void) {
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152 int16_t samples[SAMPLES];
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153 float floats[SAMPLES];
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154 float floats_ref[SAMPLES];
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155 int i;
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156 pa_usec_t start, stop;
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157 pa_convert_func_t func;
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158
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159 pa_log_debug("checking NEON sconv_s16le_to_float(%d)", SAMPLES);
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160
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161 memset(floats_ref, 0, sizeof(floats_ref));
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162 memset(floats, 0, sizeof(float));
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163
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164 for (i = 0; i < SAMPLES; i++) {
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165 samples[i] = rand() - RAND_MAX/2;
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166 }
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167
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168 func = (pa_convert_func_t) pa_sconv_s16le_to_float32ne;
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169 func(SAMPLES, samples, floats_ref);
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170 pa_sconv_s16le_to_f32ne_neon(SAMPLES, samples, floats);
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171
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172 for (i = 0; i < SAMPLES; i++) {
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173 if (fabsf(floats[i] - floats_ref[i]) > 0.00001) {
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174 pa_log_debug("%d: %.8f != %.8f (%d)", i, floats[i], floats_ref[i],
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175 samples[i]);
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176 }
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177 }
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178
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179 start = pa_rtclock_now();
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180 for (i = 0; i < TIMES; i++) {
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181 pa_sconv_s16le_to_f32ne_neon(SAMPLES, samples, floats);
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182 }
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183 stop = pa_rtclock_now();
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184 pa_log_info("NEON: %llu usec.", (long long unsigned int)(stop - start));
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185
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186 start = pa_rtclock_now();
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187 for (i = 0; i < TIMES; i++) {
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188 func(SAMPLES, samples, floats_ref);
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189 }
Peter Meerwald <p.meerwald@bct-electronic.com>
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190 stop = pa_rtclock_now();
Peter Meerwald <p.meerwald@bct-electronic.com>
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191 pa_log_info("ref: %llu usec.", (long long unsigned int)(stop - start));
Peter Meerwald <p.meerwald@bct-electronic.com>
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192 }
Peter Meerwald <p.meerwald@bct-electronic.com>
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193
Peter Meerwald <p.meerwald@bct-electronic.com>
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194 #endif /* defined(__arm__) */
Peter Meerwald <p.meerwald@bct-electronic.com>
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195
Peter Meerwald <p.meerwald@bct-electronic.com>
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196 int main() {
Peter Meerwald <p.meerwald@bct-electronic.com>
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197
Peter Meerwald <p.meerwald@bct-electronic.com>
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198 run_test_from();
Peter Meerwald <p.meerwald@bct-electronic.com>
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199 run_test_to();
Peter Meerwald <p.meerwald@bct-electronic.com>
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200
Peter Meerwald <p.meerwald@bct-electronic.com>
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201 return EXIT_SUCCESS;
Peter Meerwald <p.meerwald@bct-electronic.com>
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202 }

Repositories maintained by Peter Meerwald, pmeerw@pmeerw.net.