From 108a594c0838ad21f93cba6597d1f66af097b157 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Tue, 25 Jan 2011 10:37:49 -0500
Subject: volk: New volk kernel for conjugate dot products with unaligned
buffers.
Note: need to convert this to new naming standard.
---
volk/include/volk/Makefile.am | 3 +-
.../volk/volk_32fc_conjugate_dot_prod_unaligned.h | 144 +++++++++++++++++++++
2 files changed, 146 insertions(+), 1 deletion(-)
create mode 100644 volk/include/volk/volk_32fc_conjugate_dot_prod_unaligned.h
(limited to 'volk/include')
diff --git a/volk/include/volk/Makefile.am b/volk/include/volk/Makefile.am
index 658974d3a4..00289be1eb 100644
--- a/volk/include/volk/Makefile.am
+++ b/volk/include/volk/Makefile.am
@@ -66,6 +66,7 @@ volkinclude_HEADERS = \
volk_32f_calc_spectral_noise_floor_aligned16.h \
volk_32fc_atan2_32f_aligned16.h \
volk_32fc_conjugate_dot_prod_aligned16.h \
+ volk_32fc_conjugate_dot_prod_unaligned.h \
volk_32fc_deinterleave_32f_aligned16.h \
volk_32fc_deinterleave_64f_aligned16.h \
volk_32fc_deinterleave_real_16s_aligned16.h \
@@ -157,4 +158,4 @@ distclean-local:
rm -f Makefile.in
rm -f volk_environment_init.h
rm -f volk_mktables
- rm -f $(BUILT_SOURCES)
\ No newline at end of file
+ rm -f $(BUILT_SOURCES)
diff --git a/volk/include/volk/volk_32fc_conjugate_dot_prod_unaligned.h b/volk/include/volk/volk_32fc_conjugate_dot_prod_unaligned.h
new file mode 100644
index 0000000000..ead1573fec
--- /dev/null
+++ b/volk/include/volk/volk_32fc_conjugate_dot_prod_unaligned.h
@@ -0,0 +1,144 @@
+#ifndef INCLUDED_VOLK_32fc_CONJUGATE_DOT_PROD_UNALIGNED_H
+#define INCLUDED_VOLK_32fc_CONJUGATE_DOT_PROD_UNALIGNED_H
+
+
+#include<volk/volk_complex.h>
+
+
+#if LV_HAVE_GENERIC
+
+
+static inline void volk_32fc_conjugate_dot_prod_unaligned_generic(lv_32fc_t* result, const lv_32fc_t* input, const lv_32fc_t* taps, unsigned int num_bytes) {
+
+ float * res = (float*) result;
+ float * in = (float*) input;
+ float * tp = (float*) taps;
+ unsigned int n_2_ccomplex_blocks = num_bytes >> 4;
+ unsigned int isodd = (num_bytes >> 3) &1;
+
+
+
+ float sum0[2] = {0,0};
+ float sum1[2] = {0,0};
+ int i = 0;
+
+
+ for(i = 0; i < n_2_ccomplex_blocks; ++i) {
+
+ sum0[0] += in[0] * tp[0] + in[1] * tp[1];
+ sum0[1] += (-in[0] * tp[1]) + in[1] * tp[0];
+ sum1[0] += in[2] * tp[2] + in[3] * tp[3];
+ sum1[1] += (-in[2] * tp[3]) + in[3] * tp[2];
+
+
+ in += 4;
+ tp += 4;
+
+ }
+
+
+ res[0] = sum0[0] + sum1[0];
+ res[1] = sum0[1] + sum1[1];
+
+
+
+ for(i = 0; i < isodd; ++i) {
+
+
+ *result += input[(num_bytes >> 3) - 1] * lv_conj(taps[(num_bytes >> 3) - 1]);
+
+ }
+ /*
+ for(i = 0; i < num_bytes >> 3; ++i) {
+ *result += input[i] * conjf(taps[i]);
+ }
+ */
+}
+
+#endif /*LV_HAVE_GENERIC*/
+
+#if LV_HAVE_SSE3
+
+#include <xmmintrin.h>
+#include <pmmintrin.h>
+#include <mmintrin.h>
+
+
+static inline void volk_32fc_conjugate_dot_prod_unaligned_sse3(lv_32fc_t* result, const lv_32fc_t* input, const lv_32fc_t* taps, unsigned int num_bytes) {
+
+ static const uint32_t conjugator[4] __attribute__((aligned(16)))= {0x00000000, 0x80000000, 0x00000000, 0x80000000};
+
+ union HalfMask {
+ uint32_t intRep[4];
+ __m128 vec;
+ } halfMask;
+
+ union NegMask {
+ int intRep[4];
+ __m128 vec;
+ } negMask;
+
+ unsigned int offset = 0;
+ float Rsum=0, Isum=0;
+ float Im,Re;
+
+ __m128 in1, in2, Rv, fehg, Iv, Rs, Ivm, Is;
+ __m128 zv = {0,0,0,0};
+
+ halfMask.intRep[0] = halfMask.intRep[1] = 0xFFFFFFFF;
+ halfMask.intRep[2] = halfMask.intRep[3] = 0x00000000;
+
+ negMask.intRep[0] = negMask.intRep[2] = 0x80000000;
+ negMask.intRep[1] = negMask.intRep[3] = 0;
+
+ // main loop
+ while(num_bytes >= 4*sizeof(float)){
+
+ in1 = _mm_loadu_ps( (float*) (input+offset) );
+ in2 = _mm_loadu_ps( (float*) (taps+offset) );
+ Rv = in1*in2;
+ fehg = _mm_shuffle_ps(in2, in2, _MM_SHUFFLE(2,3,0,1));
+ Iv = in1*fehg;
+ Rs = _mm_hadd_ps( _mm_hadd_ps(Rv, zv) ,zv);
+ Ivm = _mm_xor_ps( negMask.vec, Iv );
+ Is = _mm_hadd_ps( _mm_hadd_ps(Ivm, zv) ,zv);
+ _mm_store_ss( &Im, Is );
+ _mm_store_ss( &Re, Rs );
+ num_bytes -= 4*sizeof(float);
+ offset += 2;
+ Rsum += Re;
+ Isum += Im;
+ }
+
+ // handle the last complex case ...
+ if(num_bytes > 0){
+
+ if(num_bytes != 4){
+ // bad things are happening
+ }
+
+ in1 = _mm_loadu_ps( (float*) (input+offset) );
+ in2 = _mm_loadu_ps( (float*) (taps+offset) );
+ Rv = _mm_and_ps(in1*in2, halfMask.vec);
+ fehg = _mm_shuffle_ps(in2, in2, _MM_SHUFFLE(2,3,0,1));
+ Iv = _mm_and_ps(in1*fehg, halfMask.vec);
+ Rs = _mm_hadd_ps(_mm_hadd_ps(Rv, zv),zv);
+ Ivm = _mm_xor_ps( negMask.vec, Iv );
+ Is = _mm_hadd_ps(_mm_hadd_ps(Ivm, zv),zv);
+ _mm_store_ss( &Im, Is );
+ _mm_store_ss( &Re, Rs );
+ Rsum += Re;
+ Isum += Im;
+ }
+
+ result[0] = lv_32fc_init(Rsum,Isum);
+ return;
+}
+
+#endif /*LV_HAVE_SSE3*/
+
+
+#endif /*INCLUDED_VOLK_32fc_CONJUGATE_DOT_PROD_UNALIGNED_H*/
+
+
+
--
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