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PPC: Altivec IMDCT
Patch by Loren Merritt Originally committed as revision 23959 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt
Måns Rullgård
parent
fe20bdf9db
commit
cf61994a17
@ -37,6 +37,7 @@
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// that involves an extra level of indirection on some PPC ABIs.
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extern void *ff_fft_dispatch_altivec[2][15];
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#if HAVE_GNU_AS
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// Convert from simd order to C order.
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static void swizzle(vec_f *z, int n)
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{
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@ -50,7 +51,7 @@ static void swizzle(vec_f *z, int n)
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}
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}
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static void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z)
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static av_always_inline void fft_dispatch(FFTContext *s, FFTComplex *z, int do_swizzle)
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{
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register vec_f v14 __asm__("v14") = {0,0,0,0};
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register vec_f v15 __asm__("v15") = *(const vec_f*)ff_cos_16;
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@ -76,19 +77,128 @@ static void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z)
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"subi "r(1)","r(1) ",%1 \n"
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"bctrl \n"
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"addi "r(1)","r(1) ",%1 \n"
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::"r"(ff_fft_dispatch_altivec[1][s->nbits-2]), "i"(12*sizeof(void*)),
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::"r"(ff_fft_dispatch_altivec[do_swizzle][s->nbits-2]), "i"(12*sizeof(void*)),
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"r"(zarg), "r"(cos_tabs),
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"v"(v14),"v"(v15),"v"(v16),"v"(v17),"v"(v18),"v"(v19),"v"(v20),"v"(v21),
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"v"(v22),"v"(v23),"v"(v24),"v"(v25),"v"(v26),"v"(v27),"v"(v28),"v"(v29)
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: "lr","ctr","r0","r4","r5","r6","r7","r8","r9","r10","r11",
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"v0","v1","v2","v3","v4","v5","v6","v7","v8","v9","v10","v11","v12","v13"
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);
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if (s->nbits <= 4)
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if (do_swizzle && s->nbits <= 4)
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swizzle((vec_f*)z, 1<<s->nbits);
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}
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static void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z)
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{
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fft_dispatch(s, z, 1);
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}
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static void ff_imdct_half_altivec(FFTContext *s, FFTSample *output, const FFTSample *input)
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{
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int j, k;
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int n = 1 << s->mdct_bits;
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int n4 = n >> 2;
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int n8 = n >> 3;
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int n32 = n >> 5;
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const uint16_t *revtabj = s->revtab;
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const uint16_t *revtabk = s->revtab+n4;
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const vec_f *tcos = (const vec_f*)(s->tcos+n8);
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const vec_f *tsin = (const vec_f*)(s->tsin+n8);
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const vec_f *pin = (const vec_f*)(input+n4);
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vec_f *pout = (vec_f*)(output+n4);
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/* pre rotation */
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k = n32-1;
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do {
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vec_f cos,sin,cos0,sin0,cos1,sin1,re,im,r0,i0,r1,i1,a,b,c,d;
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#define CMULA(p,o0,o1,o2,o3)\
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a = pin[ k*2+p]; /* { z[k].re, z[k].im, z[k+1].re, z[k+1].im } */\
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b = pin[-k*2-p-1]; /* { z[-k-2].re, z[-k-2].im, z[-k-1].re, z[-k-1].im } */\
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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 } */\
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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 } */\
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cos = vec_perm(cos0, cos1, vcprm(o0,o1,s##o2,s##o3)); /* { cos[k], cos[k+1], cos[-k-2], cos[-k-1] } */\
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sin = vec_perm(sin0, sin1, vcprm(o0,o1,s##o2,s##o3));\
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r##p = im*cos - re*sin;\
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i##p = re*cos + im*sin;
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#define STORE2(v,dst)\
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j = dst;\
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vec_ste(v, 0, output+j*2);\
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vec_ste(v, 4, output+j*2);
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#define STORE8(p)\
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a = vec_perm(r##p, i##p, vcprm(0,s0,0,s0));\
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b = vec_perm(r##p, i##p, vcprm(1,s1,1,s1));\
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c = vec_perm(r##p, i##p, vcprm(2,s2,2,s2));\
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d = vec_perm(r##p, i##p, vcprm(3,s3,3,s3));\
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STORE2(a, revtabk[ p*2-4]);\
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STORE2(b, revtabk[ p*2-3]);\
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STORE2(c, revtabj[-p*2+2]);\
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STORE2(d, revtabj[-p*2+3]);
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cos0 = tcos[k];
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sin0 = tsin[k];
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cos1 = tcos[-k-1];
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sin1 = tsin[-k-1];
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CMULA(0, 0,1,2,3);
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CMULA(1, 2,3,0,1);
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STORE8(0);
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STORE8(1);
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revtabj += 4;
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revtabk -= 4;
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k--;
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} while(k >= 0);
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fft_dispatch(s, (FFTComplex*)output, 0);
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/* post rotation + reordering */
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j = -n32;
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k = n32-1;
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do {
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vec_f cos,sin,re,im,a,b,c,d;
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#define CMULB(d0,d1,o)\
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re = pout[o*2];\
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im = pout[o*2+1];\
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cos = tcos[o];\
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sin = tsin[o];\
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d0 = im*sin - re*cos;\
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d1 = re*sin + im*cos;
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CMULB(a,b,j);
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CMULB(c,d,k);
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pout[2*j] = vec_perm(a, d, vcprm(0,s3,1,s2));
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pout[2*j+1] = vec_perm(a, d, vcprm(2,s1,3,s0));
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pout[2*k] = vec_perm(c, b, vcprm(0,s3,1,s2));
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pout[2*k+1] = vec_perm(c, b, vcprm(2,s1,3,s0));
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j++;
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k--;
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} while(k >= 0);
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}
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static void ff_imdct_calc_altivec(FFTContext *s, FFTSample *output, const FFTSample *input)
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{
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int k;
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int n = 1 << s->mdct_bits;
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int n4 = n >> 2;
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int n16 = n >> 4;
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vec_u32 sign = {1<<31,1<<31,1<<31,1<<31};
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vec_u32 *p0 = (vec_u32*)(output+n4);
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vec_u32 *p1 = (vec_u32*)(output+n4*3);
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ff_imdct_half_altivec(s, output+n4, input);
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for (k = 0; k < n16; k++) {
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vec_u32 a = p0[k] ^ sign;
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vec_u32 b = p1[-k-1];
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p0[-k-1] = vec_perm(a, a, vcprm(3,2,1,0));
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p1[k] = vec_perm(b, b, vcprm(3,2,1,0));
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}
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}
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#endif /* HAVE_GNU_AS */
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av_cold void ff_fft_init_altivec(FFTContext *s)
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{
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if (HAVE_GNU_AS)
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if (HAVE_GNU_AS) {
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s->fft_calc = ff_fft_calc_altivec;
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s->imdct_calc = ff_imdct_calc_altivec;
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s->imdct_half = ff_imdct_half_altivec;
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}
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}
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