From 14d918151bd447d854c3d0b34a9d542a5dff38ff Mon Sep 17 00:00:00 2001
From: Anthony Blake <anthonix@me.com>
Date: Sat, 6 Sep 2014 01:35:32 -0500
Subject: Add FFTS v0.7

---
 lib/ffts/tests/test.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 lib/ffts/tests/test.c

(limited to 'lib/ffts/tests/test.c')

diff --git a/lib/ffts/tests/test.c b/lib/ffts/tests/test.c
new file mode 100644
index 0000000..03f8f7a
--- /dev/null
+++ b/lib/ffts/tests/test.c
@@ -0,0 +1,176 @@
+/*
+ 
+ This file is part of SFFT.
+  
+ Copyright (c) 2012, Anthony M. Blake
+ 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 <stdio.h>
+#include <math.h>
+
+#ifdef __ARM_NEON__
+#endif
+#ifdef HAVE_SSE
+	#include <xmmintrin.h>
+#endif 
+
+#include "../include/ffts.h"
+
+
+#define PI 3.1415926535897932384626433832795028841971693993751058209
+
+float impulse_error(int N, int sign, float *data) {
+#ifdef __ANDROID__
+	double delta_sum = 0.0f;
+	double sum = 0.0f;
+#else
+	long double delta_sum = 0.0f;
+	long double sum = 0.0f;
+#endif 
+
+	int i;
+	for(i=0;i<N;i++) {
+#ifdef __ANDROID__
+		double re, im;
+		if(sign < 0) {
+			re = cos(2 * PI * (double)i / (double)N); 
+			im = -sin(2 * PI * (double)i / (double)N); 
+		}else{
+			re = cos(2 * PI * (double)i / (double)N); 
+			im = sin(2 * PI * (double)i / (double)N); 
+		}
+#else
+		long double re, im;
+		if(sign < 0) {
+			re = cosl(2 * PI * (long double)i / (long double)N); 
+			im = -sinl(2 * PI * (long double)i / (long double)N); 
+		}else{
+			re = cosl(2 * PI * (long double)i / (long double)N); 
+			im = sinl(2 * PI * (long double)i / (long double)N); 
+		}
+#endif
+		sum += re * re + im * im;
+
+		re = re - data[2*i];
+		im = im - data[2*i+1];
+		
+		delta_sum += re * re + im * im;
+
+	}
+#ifdef __ANDROID__
+	return sqrt(delta_sum) / sqrt(sum);
+#else
+	return sqrtl(delta_sum) / sqrtl(sum);
+#endif
+}
+
+int 
+test_transform(int n, int sign) {
+
+#ifdef HAVE_SSE 
+	float __attribute__ ((aligned(32))) *input = _mm_malloc(2 * n * sizeof(float), 32);
+  float __attribute__ ((aligned(32))) *output = _mm_malloc(2 * n * sizeof(float), 32);
+#else
+	float __attribute__ ((aligned(32))) *input = valloc(2 * n * sizeof(float));
+  float __attribute__ ((aligned(32))) *output = valloc(2 * n * sizeof(float));
+#endif
+	int i;	
+	for(i=0;i<n;i++) {
+		input[2*i]   = 0.0f;
+		input[2*i+1] = 0.0f;
+	}
+
+	input[2] = 1.0f;
+
+	ffts_plan_t *p = ffts_init_1d(i, sign);
+	if(p) {
+		ffts_execute(p, input, output);
+		printf(" %3d  | %9d | %10E\n", sign, n, impulse_error(n, sign, output));
+  	ffts_free(p);
+	}else{
+		printf("Plan unsupported\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+int
+main(int argc, char *argv[]) {
+	
+	if(argc == 3) {
+		// test specific transform with test pattern and display output
+		int n = atoi(argv[1]);
+		int sign = atoi(argv[2]);
+
+#ifdef HAVE_SSE
+		float __attribute__ ((aligned(32))) *input = _mm_malloc(2 * n * sizeof(float), 32);
+		float __attribute__ ((aligned(32))) *output = _mm_malloc(2 * n * sizeof(float), 32);
+#else
+		float __attribute__ ((aligned(32))) *input = valloc(2 * n * sizeof(float));
+		float __attribute__ ((aligned(32))) *output = valloc(2 * n * sizeof(float));
+#endif
+		int i;	
+		for(i=0;i<n;i++) {
+			input[2*i]   = i;
+			input[2*i+1] = 0.0f;
+		}
+
+	//	input[2] = 1.0f;
+
+		ffts_plan_t *p = ffts_init_1d(i, sign);
+		if(p) {
+			ffts_execute(p, input, output);
+			for(i=0;i<n;i++) printf("%d %d %f %f\n", i, sign, output[2*i], output[2*i+1]);
+			ffts_free(p);
+		}else{
+			printf("Plan unsupported\n");
+			return 0;
+		}
+
+#ifdef HAVE_NEON 
+		_mm_free(input);
+		_mm_free(output);
+#else
+		free(input);
+		free(output);
+#endif
+
+	}else{
+		// test various sizes and display error
+		printf(" Sign |      Size |     L2 Error\n");
+		printf("------+-----------+-------------\n");
+		int n;
+		for(n=1;n<=18;n++) {
+			test_transform(pow(2,n), -1);
+		}
+		for(n=1;n<=18;n++) {
+			test_transform(pow(2,n), 1);
+		}
+	}
+  return 0;
+}
-- 
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