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-rw-r--r--libavutil/softfloat.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/libavutil/softfloat.c b/libavutil/softfloat.c
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+++ b/libavutil/softfloat.c
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+/*
+ * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include "softfloat.h"
+#include "common.h"
+#include "log.h"
+
+#undef printf
+
+int main(void){
+ SoftFloat one= av_int2sf(1, 0);
+ SoftFloat sf1, sf2;
+ double d1, d2;
+ int i, j;
+ av_log_set_level(AV_LOG_DEBUG);
+
+ d1= 1;
+ for(i= 0; i<10; i++){
+ d1= 1/(d1+1);
+ }
+ printf("test1 double=%d\n", (int)(d1 * (1<<24)));
+
+ sf1= one;
+ for(i= 0; i<10; i++){
+ sf1= av_div_sf(one, av_normalize_sf(av_add_sf(one, sf1)));
+ }
+ printf("test1 sf =%d\n", av_sf2int(sf1, 24));
+
+
+ for(i= 0; i<100; i++){
+ START_TIMER
+ d1= i;
+ d2= i/100.0;
+ for(j= 0; j<1000; j++){
+ d1= (d1+1)*d2;
+ }
+ STOP_TIMER("float add mul")
+ }
+ printf("test2 double=%d\n", (int)(d1 * (1<<24)));
+
+ for(i= 0; i<100; i++){
+ START_TIMER
+ sf1= av_int2sf(i, 0);
+ sf2= av_div_sf(av_int2sf(i, 2), av_int2sf(200, 3));
+ for(j= 0; j<1000; j++){
+ sf1= av_mul_sf(av_add_sf(sf1, one),sf2);
+ }
+ STOP_TIMER("softfloat add mul")
+ }
+ printf("test2 sf =%d (%d %d)\n", av_sf2int(sf1, 24), sf1.exp, sf1.mant);
+ return 0;
+}