1 files changed, 77 insertions, 0 deletions
diff --git a/volk/include/volk/volk_32u_byteswap_a.h b/volk/include/volk/volk_32u_byteswap_a.h
new file mode 100644
index 000000000..b88848096
--- /dev/null
+++ b/volk/include/volk/volk_32u_byteswap_a.h
@@ -0,0 +1,77 @@
+#ifndef INCLUDED_volk_32u_byteswap_a_H
+#define INCLUDED_volk_32u_byteswap_a_H
+
+#include <inttypes.h>
+#include <stdio.h>
+
+#ifdef 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_a_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 */
+
+#ifdef 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_a_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_a_H */