static signed long
vIntDotProduct ( vector signed short x[], vector signed short y[], long int n )
{
typedef union
{
signed long xElem[4];
vector signed int vWord;
} WordToVector;
long int i;
vector signed int partialProduct, zero = ( vector signed int ) {
0,0,0,0
};
WordToVector sum;
partialProduct = zero;
for ( i = 0; i < n ; i++ )
partialProduct = vec_msums ( x[i], y[i], partialProduct );
sum.vWord = vec_sums( partialProduct, zero);
return sum.xElem[3];
}
int
main()
{
mainInt();
exit(0);
}
void jsimd_rgb_gray_convert_altivec (JDIMENSION img_width,
JSAMPARRAY input_buf,
JSAMPIMAGE output_buf,
JDIMENSION output_row, int num_rows)
{
JSAMPROW inptr, outptr;
int pitch;
__vector unsigned char rgb0, rgb1 = {0}, rgb2 = {0}, rgb3 = {0}, rgbg0,
rgbg1, rgbg2, rgbg3, y;
#if RGB_PIXELSIZE == 4
__vector unsigned char rgb4;
#endif
__vector short rg0, rg1, rg2, rg3, bg0, bg1, bg2, bg3;
__vector unsigned short y01, y23;
__vector int y0, y1, y2, y3;
/* Constants */
__vector short pw_f0299_f0337 = { __4X2(F_0_299, F_0_337) },
pw_f0114_f0250 = { __4X2(F_0_114, F_0_250) };
__vector int pd_onehalf = { __4X(ONE_HALF) };
__vector unsigned char zero = { __16X(0) },
shift_pack_index =
{ 0, 1, 4, 5, 8, 9, 12, 13, 16, 17, 20, 21, 24, 25, 28, 29};
while (--num_rows >= 0) {
inptr = *input_buf++;
outptr = output_buf[0][output_row];
output_row++;
for (pitch = img_width * RGB_PIXELSIZE; pitch > 0;
pitch -= RGB_PIXELSIZE * 16, inptr += RGB_PIXELSIZE * 16,
outptr += 16) {
#if RGB_PIXELSIZE == 3
/* Load 16 pixels == 48 bytes */
if ((size_t)inptr & 15) {
__vector unsigned char unaligned_shift_index;
rgb0 = vec_ld(0, inptr);
if (pitch > 16)
rgb1 = vec_ld(16, inptr);
else
rgb1 = vec_ld(-1, inptr + pitch);
if (pitch > 32)
rgb2 = vec_ld(32, inptr);
else
rgb2 = vec_ld(-1, inptr + pitch);
if (pitch > 48)
rgb3 = vec_ld(48, inptr);
else
rgb3 = vec_ld(-1, inptr + pitch);
unaligned_shift_index = vec_lvsl(0, inptr);
rgb0 = vec_perm(rgb0, rgb1, unaligned_shift_index);
rgb1 = vec_perm(rgb1, rgb2, unaligned_shift_index);
rgb2 = vec_perm(rgb2, rgb3, unaligned_shift_index);
} else {
rgb0 = vec_ld(0, inptr);
if (pitch > 16)
rgb1 = vec_ld(16, inptr);
if (pitch > 32)
rgb2 = vec_ld(32, inptr);
}
/* rgb0 = R0 G0 B0 R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4 R5
* rgb1 = G5 B5 R6 G6 B6 R7 G7 B7 R8 G8 B8 R9 G9 B9 Ra Ga
* rgb2 = Ba Rb Gb Bb Rc Gc Bc Rd Gd Bd Re Ge Be Rf Gf Bf
*
* rgbg0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 G0 B1 G1 B2 G2 B3 G3
* rgbg1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 G4 B5 G5 B6 G6 B7 G7
* rgbg2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 G8 B9 G9 Ba Ga Bb Gb
* rgbg3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Gc Bd Gd Be Ge Bf Gf
*/
rgbg0 = vec_perm(rgb0, rgb0, (__vector unsigned char)RGBG_INDEX0);
rgbg1 = vec_perm(rgb0, rgb1, (__vector unsigned char)RGBG_INDEX1);
rgbg2 = vec_perm(rgb1, rgb2, (__vector unsigned char)RGBG_INDEX2);
rgbg3 = vec_perm(rgb2, rgb2, (__vector unsigned char)RGBG_INDEX3);
#else
/* Load 16 pixels == 64 bytes */
if ((size_t)inptr & 15) {
__vector unsigned char unaligned_shift_index;
rgb0 = vec_ld(0, inptr);
if (pitch > 16)
rgb1 = vec_ld(16, inptr);
else
rgb1 = vec_ld(-1, inptr + pitch);
if (pitch > 32)
rgb2 = vec_ld(32, inptr);
else
rgb2 = vec_ld(-1, inptr + pitch);
if (pitch > 48)
rgb3 = vec_ld(48, inptr);
else
rgb3 = vec_ld(-1, inptr + pitch);
if (pitch > 64)
rgb4 = vec_ld(64, inptr);
else
rgb4 = vec_ld(-1, inptr + pitch);
unaligned_shift_index = vec_lvsl(0, inptr);
rgb0 = vec_perm(rgb0, rgb1, unaligned_shift_index);
rgb1 = vec_perm(rgb1, rgb2, unaligned_shift_index);
rgb2 = vec_perm(rgb2, rgb3, unaligned_shift_index);
rgb3 = vec_perm(rgb3, rgb4, unaligned_shift_index);
} else {
rgb0 = vec_ld(0, inptr);
if (pitch > 16)
rgb1 = vec_ld(16, inptr);
if (pitch > 32)
rgb2 = vec_ld(32, inptr);
if (pitch > 48)
rgb3 = vec_ld(48, inptr);
}
/* rgb0 = R0 G0 B0 X0 R1 G1 B1 X1 R2 G2 B2 X2 R3 G3 B3 X3
* rgb0 = R4 G4 B4 X4 R5 G5 B5 X5 R6 G6 B6 X6 R7 G7 B7 X7
* rgb0 = R8 G8 B8 X8 R9 G9 B9 X9 Ra Ga Ba Xa Rb Gb Bb Xb
* rgb0 = Rc Gc Bc Xc Rd Gd Bd Xd Re Ge Be Xe Rf Gf Bf Xf
*
* rgbg0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 G0 B1 G1 B2 G2 B3 G3
* rgbg1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 G4 B5 G5 B6 G6 B7 G7
* rgbg2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 G8 B9 G9 Ba Ga Bb Gb
* rgbg3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Gc Bd Gd Be Ge Bf Gf
*/
rgbg0 = vec_perm(rgb0, rgb0, (__vector unsigned char)RGBG_INDEX);
rgbg1 = vec_perm(rgb1, rgb1, (__vector unsigned char)RGBG_INDEX);
rgbg2 = vec_perm(rgb2, rgb2, (__vector unsigned char)RGBG_INDEX);
rgbg3 = vec_perm(rgb3, rgb3, (__vector unsigned char)RGBG_INDEX);
#endif
/* rg0 = R0 G0 R1 G1 R2 G2 R3 G3
* bg0 = B0 G0 B1 G1 B2 G2 B3 G3
* ...
*
* NOTE: We have to use vec_merge*() here because vec_unpack*() doesn't
* support unsigned vectors.
*/
rg0 = (__vector signed short)vec_mergeh(zero, rgbg0);
bg0 = (__vector signed short)vec_mergel(zero, rgbg0);
rg1 = (__vector signed short)vec_mergeh(zero, rgbg1);
bg1 = (__vector signed short)vec_mergel(zero, rgbg1);
rg2 = (__vector signed short)vec_mergeh(zero, rgbg2);
bg2 = (__vector signed short)vec_mergel(zero, rgbg2);
rg3 = (__vector signed short)vec_mergeh(zero, rgbg3);
bg3 = (__vector signed short)vec_mergel(zero, rgbg3);
/* (Original)
* Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
*
* (This implementation)
* Y = 0.29900 * R + 0.33700 * G + 0.11400 * B + 0.25000 * G
*/
/* Calculate Y values */
y0 = vec_msums(rg0, pw_f0299_f0337, pd_onehalf);
y1 = vec_msums(rg1, pw_f0299_f0337, pd_onehalf);
y2 = vec_msums(rg2, pw_f0299_f0337, pd_onehalf);
y3 = vec_msums(rg3, pw_f0299_f0337, pd_onehalf);
y0 = vec_msums(bg0, pw_f0114_f0250, y0);
y1 = vec_msums(bg1, pw_f0114_f0250, y1);
y2 = vec_msums(bg2, pw_f0114_f0250, y2);
y3 = vec_msums(bg3, pw_f0114_f0250, y3);
/* Clever way to avoid 4 shifts + 2 packs. This packs the high word from
* each dword into a new 16-bit vector, which is the equivalent of
* descaling the 32-bit results (right-shifting by 16 bits) and then
* packing them.
*/
y01 = vec_perm((__vector unsigned short)y0, (__vector unsigned short)y1,
shift_pack_index);
y23 = vec_perm((__vector unsigned short)y2, (__vector unsigned short)y3,
shift_pack_index);
y = vec_pack(y01, y23);
vec_st(y, 0, outptr);
}
}
}
