void
jsimd_h2v1_downsample_altivec (JDIMENSION image_width, int max_v_samp_factor,
JDIMENSION v_samp_factor,
JDIMENSION width_blocks,
JSAMPARRAY input_data, JSAMPARRAY output_data)
{
int outrow, outcol;
JDIMENSION output_cols = width_blocks * DCTSIZE;
JSAMPROW inptr, outptr;
__vector unsigned char this0, next0, out;
__vector unsigned short this0e, this0o, next0e, next0o, outl, outh;
/* Constants */
__vector unsigned short pw_bias = { __4X2(0, 1) },
pw_one = { __8X(1) };
__vector unsigned char even_odd_index =
{0,2,4,6,8,10,12,14,1,3,5,7,9,11,13,15},
pb_zero = { __16X(0) };
expand_right_edge(input_data, max_v_samp_factor, image_width,
output_cols * 2);
for (outrow = 0; outrow < v_samp_factor; outrow++) {
outptr = output_data[outrow];
inptr = input_data[outrow];
for (outcol = output_cols; outcol > 0;
outcol -= 16, inptr += 32, outptr += 16) {
this0 = vec_ld(0, inptr);
this0 = vec_perm(this0, this0, even_odd_index);
this0e = (__vector unsigned short)VEC_UNPACKHU(this0);
this0o = (__vector unsigned short)VEC_UNPACKLU(this0);
outl = vec_add(this0e, this0o);
outl = vec_add(outl, pw_bias);
outl = vec_sr(outl, pw_one);
if (outcol > 8) {
next0 = vec_ld(16, inptr);
next0 = vec_perm(next0, next0, even_odd_index);
next0e = (__vector unsigned short)VEC_UNPACKHU(next0);
next0o = (__vector unsigned short)VEC_UNPACKLU(next0);
outh = vec_add(next0e, next0o);
outh = vec_add(outh, pw_bias);
outh = vec_sr(outh, pw_one);
} else
outh = vec_splat_u16(0);
out = vec_pack(outl, outh);
vec_st(out, 0, outptr);
}
}
}
void
jsimd_convsamp_altivec (JSAMPARRAY sample_data, JDIMENSION start_col,
DCTELEM * workspace)
{
JSAMPROW elemptr;
__vector unsigned char in0, in1, in2, in3, in4, in5, in6, in7;
__vector short out0, out1, out2, out3, out4, out5, out6, out7;
/* Constants */
__vector short pw_centerjsamp = { __8X(CENTERJSAMPLE) };
__vector unsigned char pb_zero = { __16X(0) };
LOAD_ROW(0);
LOAD_ROW(1);
LOAD_ROW(2);
LOAD_ROW(3);
LOAD_ROW(4);
LOAD_ROW(5);
LOAD_ROW(6);
LOAD_ROW(7);
out0 = (__vector short)VEC_UNPACKHU(in0);
out1 = (__vector short)VEC_UNPACKHU(in1);
out2 = (__vector short)VEC_UNPACKHU(in2);
out3 = (__vector short)VEC_UNPACKHU(in3);
out4 = (__vector short)VEC_UNPACKHU(in4);
out5 = (__vector short)VEC_UNPACKHU(in5);
out6 = (__vector short)VEC_UNPACKHU(in6);
out7 = (__vector short)VEC_UNPACKHU(in7);
out0 = vec_sub(out0, pw_centerjsamp);
out1 = vec_sub(out1, pw_centerjsamp);
out2 = vec_sub(out2, pw_centerjsamp);
out3 = vec_sub(out3, pw_centerjsamp);
out4 = vec_sub(out4, pw_centerjsamp);
out5 = vec_sub(out5, pw_centerjsamp);
out6 = vec_sub(out6, pw_centerjsamp);
out7 = vec_sub(out7, pw_centerjsamp);
vec_st(out0, 0, workspace);
vec_st(out1, 16, workspace);
vec_st(out2, 32, workspace);
vec_st(out3, 48, workspace);
vec_st(out4, 64, workspace);
vec_st(out5, 80, workspace);
vec_st(out6, 96, workspace);
vec_st(out7, 112, workspace);
}
