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non-x86 support: Only use SSE2 when supported

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Add generic version of viterbi decoder that does not utilize x86
intrinsics to provide support for other architectures such as ARM.
This commit is contained in:
Stephen Wolfe
2016-11-03 11:04:17 -04:00
parent d96ffc6ec8
commit c6502ae022
4 changed files with 290 additions and 3 deletions
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lib/viterbi_decoder.h
+25
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@@ -17,7 +17,9 @@
#ifndef INCLUDED_IEEE802_11_VITERBI_DECODER_H
#define INCLUDED_IEEE802_11_VITERBI_DECODER_H
#ifdef IEEE80211_MSSE2
#include <xmmintrin.h>
#endif
#include "utils.h"
namespace gr {
@@ -50,15 +52,28 @@ private:
unsigned char d_ppresult[TRACEBACK_MAX][64] __attribute__((aligned(16)));
#ifdef IEEE80211_MSSE2
union branchtab27 {
unsigned char c[32];
__m128i v[2];
} d_branchtab27_sse2[2];
#else
union branchtab27 {
unsigned char c[32];
} d_branchtab27_generic[2];
#endif
#ifdef IEEE80211_MSSE2
__m128i d_metric0[4] __attribute__ ((aligned(16)));
__m128i d_metric1[4] __attribute__ ((aligned(16)));
__m128i d_path0[4] __attribute__ ((aligned(16)));
__m128i d_path1[4] __attribute__ ((aligned(16)));
#else
unsigned char d_metric0_generic[64] __attribute__ ((aligned(16)));
unsigned char d_metric1_generic[64] __attribute__ ((aligned(16)));
unsigned char d_path0_generic[64] __attribute__ ((aligned(16)));
unsigned char d_path1_generic[64] __attribute__ ((aligned(16)));
#endif
int d_ntraceback;
int d_k;
@@ -76,11 +91,21 @@ private:
void reset();
uint8_t* depuncture(uint8_t *in);
#ifdef IEEE80211_MSSE2
void viterbi_chunks_init_sse2();
void viterbi_butterfly2_sse2(unsigned char *symbols,
__m128i m0[], __m128i m1[], __m128i p0[], __m128i p1[]);
unsigned char viterbi_get_output_sse2(__m128i *mm0,
__m128i *pp0, int ntraceback, unsigned char *outbuf);
#else
void viterbi_chunks_init_generic();
void viterbi_butterfly2_generic(unsigned char *symbols,
unsigned char m0[], unsigned char m1[], unsigned char p0[],
unsigned char p1[]);
unsigned char viterbi_get_output_generic(unsigned char *mm0,
unsigned char *pp0, int ntraceback, unsigned char *outbuf);
#endif
};
} // namespace ieee802_11