altivec_packIntArrayToCharArray(int *val, uint8_t* dest, int dstW) { register int i; vector unsigned int altivec_vectorShiftInt19 = vec_add(vec_splat_u32(10),vec_splat_u32(9)); if ((unsigned long)dest % 16) { /* badly aligned store, we force store alignement */ /* and will handle load misalignement on val w/ vec_perm */ vector unsigned char perm1; vector signed int v1; for (i = 0 ; (i < dstW) && (((unsigned long)dest + i) % 16) ; i++) { int t = val[i] >> 19; dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t); } perm1 = vec_lvsl(i << 2, val); v1 = vec_ld(i << 2, val); for ( ; i < (dstW - 15); i+=16) { int offset = i << 2; vector signed int v2 = vec_ld(offset + 16, val); vector signed int v3 = vec_ld(offset + 32, val); vector signed int v4 = vec_ld(offset + 48, val); vector signed int v5 = vec_ld(offset + 64, val); vector signed int v12 = vec_perm(v1,v2,perm1); vector signed int v23 = vec_perm(v2,v3,perm1); vector signed int v34 = vec_perm(v3,v4,perm1); vector signed int v45 = vec_perm(v4,v5,perm1); vector signed int vA = vec_sra(v12, altivec_vectorShiftInt19); vector signed int vB = vec_sra(v23, altivec_vectorShiftInt19); vector signed int vC = vec_sra(v34, altivec_vectorShiftInt19); vector signed int vD = vec_sra(v45, altivec_vectorShiftInt19); vector unsigned short vs1 = vec_packsu(vA, vB); vector unsigned short vs2 = vec_packsu(vC, vD); vector unsigned char vf = vec_packsu(vs1, vs2); vec_st(vf, i, dest); v1 = v5; } } else { // dest is properly aligned, great for (i = 0; i < (dstW - 15); i+=16) { int offset = i << 2; vector signed int v1 = vec_ld(offset, val); vector signed int v2 = vec_ld(offset + 16, val); vector signed int v3 = vec_ld(offset + 32, val); vector signed int v4 = vec_ld(offset + 48, val); vector signed int v5 = vec_sra(v1, altivec_vectorShiftInt19); vector signed int v6 = vec_sra(v2, altivec_vectorShiftInt19); vector signed int v7 = vec_sra(v3, altivec_vectorShiftInt19); vector signed int v8 = vec_sra(v4, altivec_vectorShiftInt19); vector unsigned short vs1 = vec_packsu(v5, v6); vector unsigned short vs2 = vec_packsu(v7, v8); vector unsigned char vf = vec_packsu(vs1, vs2); vec_st(vf, i, dest); } } for ( ; i < dstW ; i++) { int t = val[i] >> 19; dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t); } }