[FFmpeg-cvslog] r23959 - trunk/libavcodec/ppc/fft_altivec.c
mru
subversion
Fri Jul 2 01:21:49 CEST 2010
Author: mru
Date: Fri Jul 2 01:21:49 2010
New Revision: 23959
Log:
PPC: Altivec IMDCT
Patch by Loren Merritt
Modified:
trunk/libavcodec/ppc/fft_altivec.c
Modified: trunk/libavcodec/ppc/fft_altivec.c
==============================================================================
--- trunk/libavcodec/ppc/fft_altivec.c Fri Jul 2 01:21:46 2010 (r23958)
+++ trunk/libavcodec/ppc/fft_altivec.c Fri Jul 2 01:21:49 2010 (r23959)
@@ -37,6 +37,7 @@
// that involves an extra level of indirection on some PPC ABIs.
extern void *ff_fft_dispatch_altivec[2][15];
+#if HAVE_GNU_AS
// Convert from simd order to C order.
static void swizzle(vec_f *z, int n)
{
@@ -50,7 +51,7 @@ static void swizzle(vec_f *z, int n)
}
}
-static void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z)
+static av_always_inline void fft_dispatch(FFTContext *s, FFTComplex *z, int do_swizzle)
{
register vec_f v14 __asm__("v14") = {0,0,0,0};
register vec_f v15 __asm__("v15") = *(const vec_f*)ff_cos_16;
@@ -76,19 +77,128 @@ static void ff_fft_calc_altivec(FFTConte
"subi "r(1)","r(1) ",%1 \n"
"bctrl \n"
"addi "r(1)","r(1) ",%1 \n"
- ::"r"(ff_fft_dispatch_altivec[1][s->nbits-2]), "i"(12*sizeof(void*)),
+ ::"r"(ff_fft_dispatch_altivec[do_swizzle][s->nbits-2]), "i"(12*sizeof(void*)),
"r"(zarg), "r"(cos_tabs),
"v"(v14),"v"(v15),"v"(v16),"v"(v17),"v"(v18),"v"(v19),"v"(v20),"v"(v21),
"v"(v22),"v"(v23),"v"(v24),"v"(v25),"v"(v26),"v"(v27),"v"(v28),"v"(v29)
: "lr","ctr","r0","r4","r5","r6","r7","r8","r9","r10","r11",
"v0","v1","v2","v3","v4","v5","v6","v7","v8","v9","v10","v11","v12","v13"
);
- if (s->nbits <= 4)
+ if (do_swizzle && s->nbits <= 4)
swizzle((vec_f*)z, 1<<s->nbits);
}
+static void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z)
+{
+ fft_dispatch(s, z, 1);
+}
+
+static void ff_imdct_half_altivec(FFTContext *s, FFTSample *output, const FFTSample *input)
+{
+ int j, k;
+ int n = 1 << s->mdct_bits;
+ int n4 = n >> 2;
+ int n8 = n >> 3;
+ int n32 = n >> 5;
+ const uint16_t *revtabj = s->revtab;
+ const uint16_t *revtabk = s->revtab+n4;
+ const vec_f *tcos = (const vec_f*)(s->tcos+n8);
+ const vec_f *tsin = (const vec_f*)(s->tsin+n8);
+ const vec_f *pin = (const vec_f*)(input+n4);
+ vec_f *pout = (vec_f*)(output+n4);
+
+ /* pre rotation */
+ k = n32-1;
+ do {
+ vec_f cos,sin,cos0,sin0,cos1,sin1,re,im,r0,i0,r1,i1,a,b,c,d;
+#define CMULA(p,o0,o1,o2,o3)\
+ a = pin[ k*2+p]; /* { z[k].re, z[k].im, z[k+1].re, z[k+1].im } */\
+ b = pin[-k*2-p-1]; /* { z[-k-2].re, z[-k-2].im, z[-k-1].re, z[-k-1].im } */\
+ re = vec_perm(a, b, vcprm(0,2,s0,s2)); /* { z[k].re, z[k+1].re, z[-k-2].re, z[-k-1].re } */\
+ im = vec_perm(a, b, vcprm(s3,s1,3,1)); /* { z[-k-1].im, z[-k-2].im, z[k+1].im, z[k].im } */\
+ cos = vec_perm(cos0, cos1, vcprm(o0,o1,s##o2,s##o3)); /* { cos[k], cos[k+1], cos[-k-2], cos[-k-1] } */\
+ sin = vec_perm(sin0, sin1, vcprm(o0,o1,s##o2,s##o3));\
+ r##p = im*cos - re*sin;\
+ i##p = re*cos + im*sin;
+#define STORE2(v,dst)\
+ j = dst;\
+ vec_ste(v, 0, output+j*2);\
+ vec_ste(v, 4, output+j*2);
+#define STORE8(p)\
+ a = vec_perm(r##p, i##p, vcprm(0,s0,0,s0));\
+ b = vec_perm(r##p, i##p, vcprm(1,s1,1,s1));\
+ c = vec_perm(r##p, i##p, vcprm(2,s2,2,s2));\
+ d = vec_perm(r##p, i##p, vcprm(3,s3,3,s3));\
+ STORE2(a, revtabk[ p*2-4]);\
+ STORE2(b, revtabk[ p*2-3]);\
+ STORE2(c, revtabj[-p*2+2]);\
+ STORE2(d, revtabj[-p*2+3]);
+
+ cos0 = tcos[k];
+ sin0 = tsin[k];
+ cos1 = tcos[-k-1];
+ sin1 = tsin[-k-1];
+ CMULA(0, 0,1,2,3);
+ CMULA(1, 2,3,0,1);
+ STORE8(0);
+ STORE8(1);
+ revtabj += 4;
+ revtabk -= 4;
+ k--;
+ } while(k >= 0);
+
+ fft_dispatch(s, (FFTComplex*)output, 0);
+
+ /* post rotation + reordering */
+ j = -n32;
+ k = n32-1;
+ do {
+ vec_f cos,sin,re,im,a,b,c,d;
+#define CMULB(d0,d1,o)\
+ re = pout[o*2];\
+ im = pout[o*2+1];\
+ cos = tcos[o];\
+ sin = tsin[o];\
+ d0 = im*sin - re*cos;\
+ d1 = re*sin + im*cos;
+
+ CMULB(a,b,j);
+ CMULB(c,d,k);
+ pout[2*j] = vec_perm(a, d, vcprm(0,s3,1,s2));
+ pout[2*j+1] = vec_perm(a, d, vcprm(2,s1,3,s0));
+ pout[2*k] = vec_perm(c, b, vcprm(0,s3,1,s2));
+ pout[2*k+1] = vec_perm(c, b, vcprm(2,s1,3,s0));
+ j++;
+ k--;
+ } while(k >= 0);
+}
+
+static void ff_imdct_calc_altivec(FFTContext *s, FFTSample *output, const FFTSample *input)
+{
+ int k;
+ int n = 1 << s->mdct_bits;
+ int n4 = n >> 2;
+ int n16 = n >> 4;
+ vec_u32 sign = {1<<31,1<<31,1<<31,1<<31};
+ vec_u32 *p0 = (vec_u32*)(output+n4);
+ vec_u32 *p1 = (vec_u32*)(output+n4*3);
+
+ ff_imdct_half_altivec(s, output+n4, input);
+
+ for (k = 0; k < n16; k++) {
+ vec_u32 a = p0[k] ^ sign;
+ vec_u32 b = p1[-k-1];
+ p0[-k-1] = vec_perm(a, a, vcprm(3,2,1,0));
+ p1[k] = vec_perm(b, b, vcprm(3,2,1,0));
+ }
+}
+#endif /* HAVE_GNU_AS */
+
av_cold void ff_fft_init_altivec(FFTContext *s)
{
- if (HAVE_GNU_AS)
+ if (HAVE_GNU_AS) {
s->fft_calc = ff_fft_calc_altivec;
+ s->imdct_calc = ff_imdct_calc_altivec;
+ s->imdct_half = ff_imdct_half_altivec;
+ }
}
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