1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
#ifndef INCLUDED_volk_32u_byteswap_a16_H
#define INCLUDED_volk_32u_byteswap_a16_H
#include <inttypes.h>
#include <stdio.h>
#if LV_HAVE_SSE2
#include <emmintrin.h>
/*!
\brief Byteswaps (in-place) an aligned vector of int32_t's.
\param intsToSwap The vector of data to byte swap
\param numDataPoints The number of data points
*/
static inline void volk_32u_byteswap_a16_sse2(uint32_t* intsToSwap, unsigned int num_points){
unsigned int number = 0;
uint32_t* inputPtr = intsToSwap;
__m128i input, byte1, byte2, byte3, byte4, output;
__m128i byte2mask = _mm_set1_epi32(0x00FF0000);
__m128i byte3mask = _mm_set1_epi32(0x0000FF00);
const uint64_t quarterPoints = num_points / 4;
for(;number < quarterPoints; number++){
// Load the 32t values, increment inputPtr later since we're doing it in-place.
input = _mm_load_si128((__m128i*)inputPtr);
// Do the four shifts
byte1 = _mm_slli_epi32(input, 24);
byte2 = _mm_slli_epi32(input, 8);
byte3 = _mm_srli_epi32(input, 8);
byte4 = _mm_srli_epi32(input, 24);
// Or bytes together
output = _mm_or_si128(byte1, byte4);
byte2 = _mm_and_si128(byte2, byte2mask);
output = _mm_or_si128(output, byte2);
byte3 = _mm_and_si128(byte3, byte3mask);
output = _mm_or_si128(output, byte3);
// Store the results
_mm_store_si128((__m128i*)inputPtr, output);
inputPtr += 4;
}
// Byteswap any remaining points:
number = quarterPoints*4;
for(; number < num_points; number++){
uint32_t outputVal = *inputPtr;
outputVal = (((outputVal >> 24) & 0xff) | ((outputVal >> 8) & 0x0000ff00) | ((outputVal << 8) & 0x00ff0000) | ((outputVal << 24) & 0xff000000));
*inputPtr = outputVal;
inputPtr++;
}
}
#endif /* LV_HAVE_SSE2 */
#if LV_HAVE_GENERIC
/*!
\brief Byteswaps (in-place) an aligned vector of int32_t's.
\param intsToSwap The vector of data to byte swap
\param numDataPoints The number of data points
*/
static inline void volk_32u_byteswap_a16_generic(uint32_t* intsToSwap, unsigned int num_points){
uint32_t* inputPtr = intsToSwap;
unsigned int point;
for(point = 0; point < num_points; point++){
uint32_t output = *inputPtr;
output = (((output >> 24) & 0xff) | ((output >> 8) & 0x0000ff00) | ((output << 8) & 0x00ff0000) | ((output << 24) & 0xff000000));
*inputPtr = output;
inputPtr++;
}
}
#endif /* LV_HAVE_GENERIC */
#endif /* INCLUDED_volk_32u_byteswap_a16_H */
|
