From 8b2d55e5d6bd43eb45ca7da1595fccc401a22158 Mon Sep 17 00:00:00 2001
From: Jukka Ojanen <jukka.ojanen@linkotec.net>
Date: Tue, 5 Apr 2016 17:52:13 +0300
Subject: Combine ffts_tranpose_scalar and ffts_transpose, and use
 ffts_transpose_scalar as native C fallback

---
 src/ffts_transpose.c | 194 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 194 insertions(+)
 create mode 100644 src/ffts_transpose.c

(limited to 'src/ffts_transpose.c')

diff --git a/src/ffts_transpose.c b/src/ffts_transpose.c
new file mode 100644
index 0000000..272cb48
--- /dev/null
+++ b/src/ffts_transpose.c
@@ -0,0 +1,194 @@
+/*
+
+This file is part of FFTS -- The Fastest Fourier Transform in the South
+
+Copyright (c) 2016, Jukka Ojanen <jukka.ojanen@kolumbus.fi>
+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_transpose.h"
+#include "ffts_internal.h"
+
+#ifdef HAVE_NEON
+#include "neon.h"
+#include <arm_neon.h>
+#elif HAVE_SSE2
+#include <emmintrin.h>
+#endif
+
+#define TSIZE 8
+
+void
+ffts_transpose(uint64_t *in, uint64_t *out, int w, int h)
+{
+#ifdef HAVE_NEON
+#if 0
+    neon_transpose4(in, out, w, h);
+#else
+    neon_transpose8(in, out, w, h);
+#endif
+#elif HAVE_SSE2
+    uint64_t FFTS_ALIGN(64) tmp[TSIZE*TSIZE];
+    int tx, ty;
+    /* int x; */
+    int 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));
+
+                __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));
+
+                ip0 += 2;
+                /* _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);
+    }
+    }
+    */
+#else
+    const int bw = 1;
+    const int bh = 8;
+    int i = 0, j = 0;
+
+    for (; i <= h - bh; i += bh) {
+        for (j = 0; j <= w - bw; j += bw) {
+            uint64_t const *ib = &in[w*i + j];
+            uint64_t *ob = &out[h*j + i];
+
+            uint64_t s_0_0 = ib[0*w + 0];
+            uint64_t s_1_0 = ib[1*w + 0];
+            uint64_t s_2_0 = ib[2*w + 0];
+            uint64_t s_3_0 = ib[3*w + 0];
+            uint64_t s_4_0 = ib[4*w + 0];
+            uint64_t s_5_0 = ib[5*w + 0];
+            uint64_t s_6_0 = ib[6*w + 0];
+            uint64_t s_7_0 = ib[7*w + 0];
+
+            ob[0*h + 0] = s_0_0;
+            ob[0*h + 1] = s_1_0;
+            ob[0*h + 2] = s_2_0;
+            ob[0*h + 3] = s_3_0;
+            ob[0*h + 4] = s_4_0;
+            ob[0*h + 5] = s_5_0;
+            ob[0*h + 6] = s_6_0;
+            ob[0*h + 7] = s_7_0;
+        }
+    }
+
+    if (i < h) {
+        int i1;
+
+        for (i1 = 0; i1 < w; i1++) {
+            for (j = i; j < h; j++) {
+                out[i1*h + j] = in[j*w + i1];
+            }
+        }
+    }
+
+    if (j < w) {
+        int j1;
+
+        for (i = j; i < w; i++) {
+            for (j1 = 0; j1 < h; j1++) {
+                out[i*h + j1] = in[j1*w + i];
+            }
+        }
+    }
+#endif
+}
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-- 
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