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Introduce float_to_int16_one_altivec 

Originally committed as revision 14927 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Luca Barbato 2008-08-23 21:02:30 +00:00
parent a3303add3c
commit 8d3d51005a
1 changed files with 13 additions and 10 deletions
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23
libavcodec/ppc/float_altivec.c
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@ -149,6 +149,17 @@ static void vector_fmul_add_add_altivec(float *dst, const float *src0,
ff_vector_fmul_add_add_c(dst, src0, src1, src2, src3, len, step);
}
static vector signed short
float_to_int16_one_altivec(const float *src)
{
vector float s0 = vec_ld(0, src);
vector float s1 = vec_ld(16, src);
vector signed int t0 = vec_cts(s0, 0);
vector signed int t1 = vec_cts(s1, 0);
return vec_packs(t0,t1);
}
void float_to_int16_altivec(int16_t *dst, const float *src, int len)
{
int i;
@ -158,13 +169,9 @@ void float_to_int16_altivec(int16_t *dst, const float *src, int len)
vector unsigned char align;
if(((long)dst)&15) //FIXME
for(i=0; i<len-7; i+=8) {
s0 = vec_ld(0, src+i);
s1 = vec_ld(16, src+i);
t0 = vec_cts(s0, 0);
d0 = vec_ld(0, dst+i);
t1 = vec_cts(s1, 0);
d = float_to_int16_one_altivec(src+i);
d1 = vec_ld(15, dst+i);
d = vec_packs(t0,t1);
d1 = vec_perm(d1, d0, vec_lvsl(0,dst+i));
align = vec_lvsr(0, dst+i);
d0 = vec_perm(d1, d, align);
@ -174,11 +181,7 @@ void float_to_int16_altivec(int16_t *dst, const float *src, int len)
}
else
for(i=0; i<len-7; i+=8) {
s0 = vec_ld(0, src+i);
s1 = vec_ld(16, src+i);
t0 = vec_cts(s0, 0);
t1 = vec_cts(s1, 0);
d = vec_packs(t0,t1);
d = float_to_int16_one_altivec(src+i);
vec_st(d, 0, dst+i);
}
}