From a2fd60437d0c7cf21a9365024efaa764bddaf3ab Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 8 Aug 2006 07:58:10 +0000 Subject: floating point "emulation" code unused currently, but might come in handy for some fpu-less cpus Originally committed as revision 5955 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavutil/softfloat.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 libavutil/softfloat.c (limited to 'libavutil/softfloat.c') diff --git a/libavutil/softfloat.c b/libavutil/softfloat.c new file mode 100644 index 0000000000..f47309f26a --- /dev/null +++ b/libavutil/softfloat.c @@ -0,0 +1,52 @@ +#include +#include +#include +#include "softfloat.h" +#include "common.h" +#include "log.h" + +#undef printf + +int main(){ + SoftFloat one= av_int2sf(1, 0); + SoftFloat sf1, sf2; + double d1, d2; + int i, j; +av_log_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; +} -- cgit v1.2.3