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avutil/softfloat: fix av_sincos_sf() 

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit d84677abd8)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-06-20 00:59:40 +02:00
parent 5524362efb
commit 2c57b7c65b
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GPG Key ID: B18E8928B3948D64
2 changed files with 2 additions and 2 deletions
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2
libavutil/softfloat.h
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@ -281,7 +281,7 @@ static av_unused void av_sincos_sf(int a, int *s, int *c)
(int64_t)av_sintbl_4_sf[(idx & 0x1f) + 1] * (a & 0x7ff) + (int64_t)av_sintbl_4_sf[(idx & 0x1f) + 1] * (a & 0x7ff) +
0x400) >> 11); 0x400) >> 11);
*c = (int)(((int64_t)cv * ct + (int64_t)sv * st + 0x20000000) >> 30); *c = (int)(((int64_t)cv * ct - (int64_t)sv * st + 0x20000000) >> 30);
*s = (int)(((int64_t)cv * st + (int64_t)sv * ct + 0x20000000) >> 30); *s = (int)(((int64_t)cv * st + (int64_t)sv * ct + 0x20000000) >> 30);
} }

2
libavutil/tests/softfloat.c
View File

@ -148,7 +148,7 @@ int main(void){
av_sincos_sf(i*(1ULL<<32)/36/4, &s, &c); av_sincos_sf(i*(1ULL<<32)/36/4, &s, &c);
errs = (double)s/ (1<<30) - sin(i*M_PI/36); errs = (double)s/ (1<<30) - sin(i*M_PI/36);
errc = (double)c/ (1<<30) - cos(i*M_PI/36); errc = (double)c/ (1<<30) - cos(i*M_PI/36);
if (fabs(errs) > 0.00000002 || fabs(errc) >0.001) { if (fabs(errs) > 0.000000004 || fabs(errc) >0.000000004) {
printf("sincos FAIL %d %f %f %f %f\n", i, (float)s/ (1<<30), (float)c/ (1<<30), sin(i*M_PI/36), cos(i*M_PI/36)); printf("sincos FAIL %d %f %f %f %f\n", i, (float)s/ (1<<30), (float)c/ (1<<30), sin(i*M_PI/36), cos(i*M_PI/36));
} }