diff options
author | Loren Merritt <lorenm@u.washington.edu> | 2010-07-02 03:21:49 +0400 |
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committer | Måns Rullgård <mans@mansr.com> | 2010-07-02 03:21:49 +0400 |
commit | cf61994a17ad8e6cc56755bcc0697d3177d06438 (patch) | |
tree | 8c1ea774a18bcc23f7e1de5334fd76d01210d37c /libavcodec/ppc | |
parent | fe20bdf9db94061791bccaf19f3538343da6e103 (diff) |
PPC: Altivec IMDCT
Patch by Loren Merritt
Originally committed as revision 23959 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ppc')
-rw-r--r-- | libavcodec/ppc/fft_altivec.c | 118 |
1 files changed, 114 insertions, 4 deletions
diff --git a/libavcodec/ppc/fft_altivec.c b/libavcodec/ppc/fft_altivec.c index fa3f7a0041..e763fe786b 100644 --- a/libavcodec/ppc/fft_altivec.c +++ b/libavcodec/ppc/fft_altivec.c @@ -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(FFTContext *s, FFTComplex *z) "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; + } } |