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annotate sconv_neon.c @ 3:e889fd0e7769

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author Peter Meerwald <p.meerwald@bct-electronic.com>
date Thu, 05 Jul 2012 17:31:56 +0200
parents b829afbea564
children 07763f536182
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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
3
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44 void pa_sconv_s16le_from_float32ne(unsigned n, const float *src, int16_t *dst) {
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45 pa_assert(src);
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46 pa_assert(dst);
0
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47
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48 for (; n > 0; n--) {
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49 float v = *(src++);
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50
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51 v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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52 *(dst++) = (int16_t) lrintf(v * 0x7FFF);
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53 }
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54 }
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55
3
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56 void pa_sconv_s16le_from_f32ne_neon(unsigned n, const float *src, int16_t *dst) {
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57 unsigned i = n & 3;
0
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58
3
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59 asm volatile (
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60 "mov %[n], %[n], lsr #2\n\t"
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61 "vdup.f32 q2, %[plusone]\n\t"
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62 "vneg.f32 q3, q2\n\t"
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63 "vdup.f32 q4, %[scale]\n\t"
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64 "vdup.u32 q5, %[mask]\n\t"
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65 "vdup.f32 q6, %[half]\n\t"
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66 "1:\n\t"
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67 "vld1.32 {q0}, [%[src]]!\n\t"
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68 "vmin.f32 q0, q0, q2\n\t" /* clamp */
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69 "vmax.f32 q0, q0, q3\n\t"
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70 "vmul.f32 q0, q0, q4\n\t" /* scale */
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71 "vand.u32 q1, q0, q5\n\t"
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72 "vorr.u32 q1, q1, q6\n\t" /* round */
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73 "vadd.f32 q0, q0, q1\n\t"
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74 "vcvt.s32.f32 q0, q0\n\t" /* narrow */
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75 "vmovn.i32 d0, q0\n\t"
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76 "subs %[n], %[n], #1\n\t"
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77 "vst1.16 {d0}, [%[dst]]!\n\t"
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78 "bgt 1b\n\t"
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79 /* output operands (or input operands that get modified) */
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80 : [dst] "+r" (dst), [src] "+r" (src), [n] "+r" (n)
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81 : [plusone] "r" (1.0f), [scale] "r" (32767.0f),
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82 [half] "r" (0.5f), [mask] "r" (0x80000000) /* input operands */
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83 : "memory", "cc", "q0", "q1", "q2", "q3", "q4", "q5", "q6" /* clobber list */
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84 );
0
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85
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86 // leftovers
3
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87 while (i--) {
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88 *dst++ = (int16_t) lrintf(PA_CLAMP_UNLIKELY(*src, -1.0f, 1.0f) * 0x7FFF);
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89 src++;
0
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90 }
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91 }
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92
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93 void pa_sconv_s16le_to_float32ne(unsigned n, const int16_t *src, float *dst) {
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94 pa_assert(src);
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95 pa_assert(dst);
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96
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97 for (; n > 0; n--)
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98 *(dst++) = ((float) (*(src++)))/(float) 0x7FFF;
0
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99 }
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100
3
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101 void pa_sconv_s16le_to_f32ne_neon(unsigned n, const int16_t *src, float *dst) {
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102 unsigned i = n & 3;
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103
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104 const float invscale = 1.0f / 0x7FFF;
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105
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106 asm volatile (
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107 "mov %[n], %[n], lsr #2\n\t"
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108 "vdup.f32 q1, %[invscale]\n\t"
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109 "1:\n\t"
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110 "vld1.16 {d0}, [%[src]]!\n\t"
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111 "vmovl.s16 q0, d0\n\t"
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112
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113 "vcvt.f32.s32 q0, q0\n\t"
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114 "vmul.f32 q0, q0, q1\n\t"
0
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115
3
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116 "subs %[n], %[n], #1\n\t"
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117 "vst1.32 {q0}, [%[dst]]!\n\t"
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118 "bgt 1b\n\t"
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119 /* output operands (or input operands that get modified) */
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120 : [dst] "+r" (dst), [src] "+r" (src), [n] "+r" (n)
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121 : [invscale] "r" (invscale) /* input operands */
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122 : "memory", "cc", "q0", "q1" /* clobber list */
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123 );
0
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124
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125 // leftovers
3
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126 while (i--) {
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127 *dst++ = *src++ * invscale;
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128 }
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129 }
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130
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131 #define SAMPLES 1019
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132 #define TIMES 100000
0
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133
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134 static void run_test_from(void) {
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135 int16_t samples[SAMPLES];
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136 int16_t samples_ref[SAMPLES];
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137 float floats[SAMPLES];
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138 int i;
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139 pa_usec_t start, stop;
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140
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141 pa_log_debug("checking NEON sconv_s16le_from_float(%d)", SAMPLES);
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142
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143 memset(samples_ref, 0, sizeof(samples_ref));
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144 memset(samples, 0, sizeof(samples));
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145
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146 for (i = 0; i < SAMPLES; i++) {
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147 floats[i] = 2.1f * (rand()/(float) RAND_MAX - 0.5f);
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148 }
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149
3
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150 pa_sconv_s16le_from_float32ne(SAMPLES, floats, samples_ref);
0
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151 pa_sconv_s16le_from_f32ne_neon(SAMPLES, floats, samples);
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152
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153 for (i = 0; i < SAMPLES; i++) {
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154 if (abs(samples[i] - samples_ref[i]) > 0) {
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155 pa_log_debug("%d: %d != %d (%f)", i, samples[i], samples_ref[i],
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156 floats[i]);
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157 }
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158 }
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159
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160 start = pa_rtclock_now();
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161 for (i = 0; i < TIMES; i++) {
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162 pa_sconv_s16le_from_f32ne_neon(SAMPLES, floats, samples);
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163 }
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164 stop = pa_rtclock_now();
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165 pa_log_info("NEON: %llu usec.", (long long unsigned int)(stop - start));
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166
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167 start = pa_rtclock_now();
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168 for (i = 0; i < TIMES; i++) {
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169 pa_sconv_s16le_from_float32ne(SAMPLES, floats, samples_ref);
0
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170 }
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171 stop = pa_rtclock_now();
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172 pa_log_info("ref: %llu usec.", (long long unsigned int)(stop - start));
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173 }
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174
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175 static void run_test_to(void) {
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176 int16_t samples[SAMPLES];
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177 float floats[SAMPLES];
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178 float floats_ref[SAMPLES];
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179 int i;
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180 pa_usec_t start, stop;
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181 pa_convert_func_t func;
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182
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183 pa_log_debug("checking NEON sconv_s16le_to_float(%d)", SAMPLES);
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184
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185 memset(floats_ref, 0, sizeof(floats_ref));
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186 memset(floats, 0, sizeof(float));
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187
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188 for (i = 0; i < SAMPLES; i++) {
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189 samples[i] = rand() - RAND_MAX/2;
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190 }
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191
Peter Meerwald <p.meerwald@bct-electronic.com>
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192 func = (pa_convert_func_t) pa_sconv_s16le_to_float32ne;
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193 func(SAMPLES, samples, floats_ref);
Peter Meerwald <p.meerwald@bct-electronic.com>
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194 pa_sconv_s16le_to_f32ne_neon(SAMPLES, samples, floats);
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195
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196 for (i = 0; i < SAMPLES; i++) {
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197 if (fabsf(floats[i] - floats_ref[i]) > 0.00001) {
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198 pa_log_debug("%d: %.8f != %.8f (%d)", i, floats[i], floats_ref[i],
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199 samples[i]);
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200 }
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201 }
Peter Meerwald <p.meerwald@bct-electronic.com>
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202
Peter Meerwald <p.meerwald@bct-electronic.com>
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203 start = pa_rtclock_now();
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204 for (i = 0; i < TIMES; i++) {
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205 pa_sconv_s16le_to_f32ne_neon(SAMPLES, samples, floats);
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206 }
Peter Meerwald <p.meerwald@bct-electronic.com>
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207 stop = pa_rtclock_now();
Peter Meerwald <p.meerwald@bct-electronic.com>
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208 pa_log_info("NEON: %llu usec.", (long long unsigned int)(stop - start));
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209
Peter Meerwald <p.meerwald@bct-electronic.com>
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210 start = pa_rtclock_now();
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211 for (i = 0; i < TIMES; i++) {
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212 func(SAMPLES, samples, floats_ref);
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213 }
Peter Meerwald <p.meerwald@bct-electronic.com>
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214 stop = pa_rtclock_now();
Peter Meerwald <p.meerwald@bct-electronic.com>
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215 pa_log_info("ref: %llu usec.", (long long unsigned int)(stop - start));
Peter Meerwald <p.meerwald@bct-electronic.com>
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216 }
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217
Peter Meerwald <p.meerwald@bct-electronic.com>
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218 #endif /* defined(__arm__) */
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219
Peter Meerwald <p.meerwald@bct-electronic.com>
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220 int main() {
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221
Peter Meerwald <p.meerwald@bct-electronic.com>
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222 run_test_from();
Peter Meerwald <p.meerwald@bct-electronic.com>
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223 run_test_to();
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224
Peter Meerwald <p.meerwald@bct-electronic.com>
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225 return EXIT_SUCCESS;
Peter Meerwald <p.meerwald@bct-electronic.com>
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226 }

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