void gmc1_altivec(uint8_t *dst /* align 8 */, uint8_t *src /* align1 */, int stride, int h, int x16, int y16, int rounder) { POWERPC_TBL_DECLARE(altivec_gmc1_num, GMC1_PERF_COND); #ifdef ALTIVEC_USE_REFERENCE_C_CODE const int A=(16-x16)*(16-y16); const int B=( x16)*(16-y16); const int C=(16-x16)*( y16); const int D=( x16)*( y16); int i; POWERPC_TBL_START_COUNT(altivec_gmc1_num, GMC1_PERF_COND); for(i=0; i<h; i++) { dst[0]= (A*src[0] + B*src[1] + C*src[stride+0] + D*src[stride+1] + rounder)>>8; dst[1]= (A*src[1] + B*src[2] + C*src[stride+1] + D*src[stride+2] + rounder)>>8; dst[2]= (A*src[2] + B*src[3] + C*src[stride+2] + D*src[stride+3] + rounder)>>8; dst[3]= (A*src[3] + B*src[4] + C*src[stride+3] + D*src[stride+4] + rounder)>>8; dst[4]= (A*src[4] + B*src[5] + C*src[stride+4] + D*src[stride+5] + rounder)>>8; dst[5]= (A*src[5] + B*src[6] + C*src[stride+5] + D*src[stride+6] + rounder)>>8; dst[6]= (A*src[6] + B*src[7] + C*src[stride+6] + D*src[stride+7] + rounder)>>8; dst[7]= (A*src[7] + B*src[8] + C*src[stride+7] + D*src[stride+8] + rounder)>>8; dst+= stride; src+= stride; } POWERPC_TBL_STOP_COUNT(altivec_gmc1_num, GMC1_PERF_COND); #else /* ALTIVEC_USE_REFERENCE_C_CODE */ const unsigned short __attribute__ ((aligned(16))) rounder_a[8] = {rounder, rounder, rounder, rounder, rounder, rounder, rounder, rounder}; const unsigned short __attribute__ ((aligned(16))) ABCD[8] = { (16-x16)*(16-y16), /* A */ ( x16)*(16-y16), /* B */ (16-x16)*( y16), /* C */ ( x16)*( y16), /* D */ 0, 0, 0, 0 /* padding */ }; register const vector unsigned char vczero = (const vector unsigned char)vec_splat_u8(0); register const vector unsigned short vcsr8 = (const vector unsigned short)vec_splat_u16(8); register vector unsigned char dstv, dstv2, src_0, src_1, srcvA, srcvB, srcvC, srcvD; register vector unsigned short Av, Bv, Cv, Dv, rounderV, tempA, tempB, tempC, tempD; int i; unsigned long dst_odd = (unsigned long)dst & 0x0000000F; unsigned long src_really_odd = (unsigned long)src & 0x0000000F; POWERPC_TBL_START_COUNT(altivec_gmc1_num, GMC1_PERF_COND); tempA = vec_ld(0, (unsigned short*)ABCD); Av = vec_splat(tempA, 0); Bv = vec_splat(tempA, 1); Cv = vec_splat(tempA, 2); Dv = vec_splat(tempA, 3); rounderV = vec_ld(0, (unsigned short*)rounder_a); // we'll be able to pick-up our 9 char elements // at src from those 32 bytes // we load the first batch here, as inside the loop // we can re-use 'src+stride' from one iteration // as the 'src' of the next. src_0 = vec_ld(0, src); src_1 = vec_ld(16, src); srcvA = vec_perm(src_0, src_1, vec_lvsl(0, src)); if (src_really_odd != 0x0000000F) { // if src & 0xF == 0xF, then (src+1) is properly aligned on the second vector. srcvB = vec_perm(src_0, src_1, vec_lvsl(1, src)); } else { srcvB = src_1; } srcvA = vec_mergeh(vczero, srcvA); srcvB = vec_mergeh(vczero, srcvB); for(i=0; i<h; i++) { dst_odd = (unsigned long)dst & 0x0000000F; src_really_odd = (((unsigned long)src) + stride) & 0x0000000F; dstv = vec_ld(0, dst); // we we'll be able to pick-up our 9 char elements // at src + stride from those 32 bytes // then reuse the resulting 2 vectors srvcC and srcvD // as the next srcvA and srcvB src_0 = vec_ld(stride + 0, src); src_1 = vec_ld(stride + 16, src); srcvC = vec_perm(src_0, src_1, vec_lvsl(stride + 0, src)); if (src_really_odd != 0x0000000F) { // if src & 0xF == 0xF, then (src+1) is properly aligned on the second vector. srcvD = vec_perm(src_0, src_1, vec_lvsl(stride + 1, src)); } else { srcvD = src_1; } srcvC = vec_mergeh(vczero, srcvC); srcvD = vec_mergeh(vczero, srcvD); // OK, now we (finally) do the math :-) // those four instructions replaces 32 int muls & 32 int adds. // isn't AltiVec nice ? tempA = vec_mladd((vector unsigned short)srcvA, Av, rounderV); tempB = vec_mladd((vector unsigned short)srcvB, Bv, tempA); tempC = vec_mladd((vector unsigned short)srcvC, Cv, tempB); tempD = vec_mladd((vector unsigned short)srcvD, Dv, tempC); srcvA = srcvC; srcvB = srcvD; tempD = vec_sr(tempD, vcsr8); dstv2 = vec_pack(tempD, (vector unsigned short)vczero); if (dst_odd) { dstv2 = vec_perm(dstv, dstv2, vcprm(0,1,s0,s1)); } else { dstv2 = vec_perm(dstv, dstv2, vcprm(s0,s1,2,3)); } vec_st(dstv2, 0, dst); dst += stride; src += stride; } POWERPC_TBL_STOP_COUNT(altivec_gmc1_num, GMC1_PERF_COND); #endif /* ALTIVEC_USE_REFERENCE_C_CODE */ }