Add FFTS v0.7

1 files changed, 282 insertions, 0 deletions

diff --git a/lib/ffts/src/ffts_nd.c b/lib/ffts/src/ffts_nd.c
new file mode 100644
index 0000000..ae9b148
--- /dev/null
+++ b/lib/ffts/src/ffts_nd.c
@@ -0,0 +1,282 @@
+/*
+ 
+ This file is part of FFTS -- The Fastest Fourier Transform in the South
+  
+ Copyright (c) 2012, Anthony M. Blake <amb@anthonix.com>
+ Copyright (c) 2012, The University of Waikato 
+ 
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ 	* Redistributions of source code must retain the above copyright
+ 		notice, this list of conditions and the following disclaimer.
+ 	* Redistributions in binary form must reproduce the above copyright
+ 		notice, this list of conditions and the following disclaimer in the
+ 		documentation and/or other materials provided with the distribution.
+ 	* Neither the name of the organization nor the
+	  names of its contributors may be used to endorse or promote products
+ 		derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL ANTHONY M. BLAKE BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+#include "ffts_nd.h"
+
+#ifdef HAVE_NEON
+#include "neon.h"
+#endif
+
+void ffts_free_nd(ffts_plan_t *p) {
+
+	int i;
+	for(i=0;i<p->rank;i++) {
+		
+		ffts_plan_t *x = p->plans[i];
+		int k;
+		for(k=0;k<i;k++) {
+			if(p->Ms[i] == p->Ms[k]) x = NULL;
+		}
+		
+		if(x)	ffts_free(x);
+	}
+
+	free(p->Ns);
+	free(p->Ms);
+	free(p->plans);
+	free(p->buf);
+	free(p->transpose_buf);
+	free(p);
+}
+#define TSIZE 8
+#include <string.h>
+void ffts_transpose(uint64_t *in, uint64_t *out, int w, int h, uint64_t *buf) {
+
+#ifdef HAVE_NEON 
+	size_t i,j,k;
+	int linebytes = w*8;
+
+	for(j=0;j<h;j+=8) {
+		for(i=0;i<w;i+=8) {
+			neon_transpose_to_buf(in + j*w + i, buf, w);
+
+			uint64_t *p = out + i*h + j;
+			uint64_t *pbuf = buf;
+			uint64_t *ptemp;
+
+			__asm__ __volatile__(
+							 "mov %[ptemp], %[p]\n\t"
+							 "add %[p], %[p], %[w], lsl #3\n\t"
+							 "vld1.32 {q8,q9}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q10,q11}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q12,q13}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q14,q15}, [%[pbuf], :128]!\n\t"
+							 "vst1.32 {q8,q9}, [%[ptemp], :128]!\n\t"
+							 "vst1.32 {q10,q11}, [%[ptemp], :128]!\n\t"
+							 "mov %[ptemp], %[p]\n\t" 
+							 "add %[p], %[p], %[w], lsl #3\n\t"
+							 "vst1.32 {q12,q13}, [%[ptemp], :128]!\n\t"
+							 "vst1.32 {q14,q15}, [%[ptemp], :128]!\n\t"
+							 "mov %[ptemp], %[p]\n\t"
+							 "add %[p], %[p], %[w], lsl #3\n\t"
+							 "vld1.32 {q8,q9}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q10,q11}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q12,q13}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q14,q15}, [%[pbuf], :128]!\n\t"
+							 "vst1.32 {q8,q9}, [%[ptemp], :128]!\n\t"
+							 "vst1.32 {q10,q11}, [%[ptemp], :128]!\n\t"
+							 "mov %[ptemp], %[p]\n\t" 
+							 "add %[p], %[p], %[w], lsl #3\n\t"
+							 "vst1.32 {q12,q13}, [%[ptemp], :128]!\n\t"
+							 "vst1.32 {q14,q15}, [%[ptemp], :128]!\n\t"
+							 "mov %[ptemp], %[p]\n\t"
+							 "add %[p], %[p], %[w], lsl #3\n\t"
+							 "vld1.32 {q8,q9}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q10,q11}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q12,q13}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q14,q15}, [%[pbuf], :128]!\n\t"
+							 "vst1.32 {q8,q9}, [%[ptemp], :128]!\n\t"
+							 "vst1.32 {q10,q11}, [%[ptemp], :128]!\n\t"
+							 "mov %[ptemp], %[p]\n\t" 
+							 "add %[p], %[p], %[w], lsl #3\n\t"
+							 "vst1.32 {q12,q13}, [%[ptemp], :128]!\n\t"
+							 "vst1.32 {q14,q15}, [%[ptemp], :128]!\n\t"
+							 "mov %[ptemp], %[p]\n\t"
+							 "add %[p], %[p], %[w], lsl #3\n\t"
+							 "vld1.32 {q8,q9}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q10,q11}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q12,q13}, [%[pbuf], :128]!\n\t"
+							 "vld1.32 {q14,q15}, [%[pbuf], :128]!\n\t"
+							 "vst1.32 {q8,q9}, [%[ptemp], :128]!\n\t"
+							 "vst1.32 {q10,q11}, [%[ptemp], :128]!\n\t"
+							 "mov %[ptemp], %[p]\n\t" 
+							 "vst1.32 {q12,q13}, [%[ptemp], :128]!\n\t"
+							 "vst1.32 {q14,q15}, [%[ptemp], :128]!\n\t"
+							 
+						: [p] "+r" (p), [pbuf] "+r" (pbuf), [ptemp] "+r" (ptemp)
+						: [w] "r" (w)
+						: "memory", "q8", "q9", "q10", "q11"
+						);
+//			out[i*h + j] = in[j*w + i];
+		}
+	}
+#else
+#ifdef HAVE_SSE
+	uint64_t tmp[TSIZE*TSIZE] __attribute__((aligned(64)));
+	int tx, ty;
+	int x, y;
+	int tw = w / TSIZE;
+	int th = h / TSIZE;
+	for (ty=0;ty<th;ty++) {
+		for (tx=0;tx<tw;tx++) {
+			uint64_t *ip0 = in + w*TSIZE*ty + tx * TSIZE;
+			uint64_t *op0 = tmp;//out + h*TSIZE*tx + ty*TSIZE;
+
+			// Copy/transpose to tmp
+			for (y=0;y<TSIZE;y+=2) {
+				//for (x=0;x<TSIZE;x+=2) {
+					//op[x*TSIZE] = ip[x];
+					__m128d q0 = _mm_load_pd((double *)(ip0 + 0*w));
+					__m128d q1 = _mm_load_pd((double *)(ip0 + 1*w));
+					__m128d q2 = _mm_load_pd((double *)(ip0 + 2*w));
+					__m128d q3 = _mm_load_pd((double *)(ip0 + 3*w));
+					__m128d q4 = _mm_load_pd((double *)(ip0 + 4*w));
+					__m128d q5 = _mm_load_pd((double *)(ip0 + 5*w));
+					__m128d q6 = _mm_load_pd((double *)(ip0 + 6*w));
+					__m128d q7 = _mm_load_pd((double *)(ip0 + 7*w));
+					ip0 += 2;	
+					
+					__m128d t0 = _mm_shuffle_pd(q0, q1, _MM_SHUFFLE2(0, 0));
+					__m128d t1 = _mm_shuffle_pd(q0, q1, _MM_SHUFFLE2(1, 1));
+					__m128d t2 = _mm_shuffle_pd(q2, q3, _MM_SHUFFLE2(0, 0));
+					__m128d t3 = _mm_shuffle_pd(q2, q3, _MM_SHUFFLE2(1, 1));
+					__m128d t4 = _mm_shuffle_pd(q4, q5, _MM_SHUFFLE2(0, 0));
+					__m128d t5 = _mm_shuffle_pd(q4, q5, _MM_SHUFFLE2(1, 1));
+					__m128d t6 = _mm_shuffle_pd(q6, q7, _MM_SHUFFLE2(0, 0));
+					__m128d t7 = _mm_shuffle_pd(q6, q7, _MM_SHUFFLE2(1, 1));
+					//_mm_store_pd((double *)(op0 + y*h + x), t0);
+					//_mm_store_pd((double *)(op0 + y*h + x + h), t1);
+					_mm_store_pd((double *)(op0 + 0), t0);
+					_mm_store_pd((double *)(op0 + 0 + TSIZE), t1);
+					_mm_store_pd((double *)(op0 + 2 ), t2);
+					_mm_store_pd((double *)(op0 + 2 + TSIZE), t3);
+					_mm_store_pd((double *)(op0 + 4 ), t4);
+					_mm_store_pd((double *)(op0 + 4 + TSIZE), t5);
+					_mm_store_pd((double *)(op0 + 6 ), t6);
+					_mm_store_pd((double *)(op0 + 6 + TSIZE), t7);
+				//}
+				op0 += 2*TSIZE;
+			}
+			
+			op0 = out + h*tx*TSIZE + ty*TSIZE;
+			ip0 = tmp;
+			for (y=0;y<TSIZE;y+=1) {
+		//		memcpy(op0, ip0, TSIZE * sizeof(*ip0));
+				
+				__m128d q0 = _mm_load_pd((double *)(ip0 + 0));
+				__m128d q1 = _mm_load_pd((double *)(ip0 + 2));
+				__m128d q2 = _mm_load_pd((double *)(ip0 + 4));
+				__m128d q3 = _mm_load_pd((double *)(ip0 + 6));
+				_mm_store_pd((double *)(op0 + 0), q0);
+				_mm_store_pd((double *)(op0 + 2), q1);
+				_mm_store_pd((double *)(op0 + 4), q2);
+				_mm_store_pd((double *)(op0 + 6), q3);
+				
+				op0 += h;
+				ip0 += TSIZE;
+			}
+
+		}
+	}
+/*
+	size_t i,j;
+	for(i=0;i<w;i+=2) {
+		for(j=0;j<h;j+=2) {
+//		out[i*h + j] = in[j*w + i];
+  		__m128d q0 = _mm_load_pd((double *)(in + j*w + i));
+  		__m128d q1 = _mm_load_pd((double *)(in + j*w + i + w));
+  		__m128d t0 = _mm_shuffle_pd(q0, q1, _MM_SHUFFLE2(0, 0));
+  		__m128d t1 = _mm_shuffle_pd(q0, q1, _MM_SHUFFLE2(1, 1));
+  		_mm_store_pd((double *)(out + i*h + j), t0);
+  		_mm_store_pd((double *)(out + i*h + j + h), t1);
+		}
+	}
+*/
+#endif
+#endif
+
+}
+
+void ffts_execute_nd(ffts_plan_t *p, const void *  in, void *  out) {
+
+	uint64_t *din = (uint64_t *)in;
+	uint64_t *buf = p->buf;
+	uint64_t *dout = (uint64_t *)out;
+
+	size_t i,j;
+	for(i=0;i<p->Ns[0];i++) {
+		p->plans[0]->transform(p->plans[0], din + (i * p->Ms[0]), buf + (i * p->Ms[0]));	
+	}
+	ffts_transpose(buf, dout, p->Ms[0], p->Ns[0], p->transpose_buf);	
+
+	for(i=1;i<p->rank;i++) {
+		for(j=0;j<p->Ns[i];j++) { 
+			p->plans[i]->transform(p->plans[i], dout + (j * p->Ms[i]), buf + (j * p->Ms[i]));	
+		}
+		ffts_transpose(buf, dout, p->Ms[i], p->Ns[i], p->transpose_buf);	
+	}
+}
+
+ffts_plan_t *ffts_init_nd(int rank, size_t *Ns, int sign) {
+	size_t vol = 1;
+
+	ffts_plan_t *p = malloc(sizeof(ffts_plan_t));
+
+	p->transform = &ffts_execute_nd;
+	p->destroy = &ffts_free_nd;
+
+	p->rank = rank;
+	p->Ns = malloc(sizeof(size_t) * rank);
+	p->Ms = malloc(sizeof(size_t) * rank);
+	p->plans = malloc(sizeof(ffts_plan_t **) * rank);
+	int i;
+	for(i=0;i<rank;i++) {
+		p->Ns[i] = Ns[i];
+		vol *= Ns[i];	
+	}
+	p->buf = valloc(sizeof(float) * 2 * vol);
+
+	for(i=0;i<rank;i++) {
+		p->Ms[i] = vol / p->Ns[i];
+
+		p->plans[i] = NULL;
+		int k;
+		for(k=0;k<i;k++) {
+			if(p->Ms[k] == p->Ms[i]) 
+				p->plans[i] = p->plans[k];
+		}
+
+		if(!p->plans[i]) p->plans[i] = ffts_init_1d(p->Ms[i], sign); 
+	}
+
+	p->transpose_buf = valloc(sizeof(float) * 2 * 8 * 8);
+	return p;
+}
+
+
+ffts_plan_t *ffts_init_2d(size_t N1, size_t N2, int sign) {
+	size_t Ns[2];
+	Ns[0] = N1;
+	Ns[1] = N2;
+	return ffts_init_nd(2, Ns, sign);
+}