To update portions of vector registers, the
upd_x() intrinsic functions are provided for 128-bit
(v), 256-bit (w), and 512-bit (x) updates.
intrinsic functions are provided to extract portions of the vector.
To update or extract individual elements, the
functions are provided. These must be used when loading or storing values that are
not in contiguous memory locations and require multiple clock cycles to load or
store a vector. In the following example, the 0th element of vector
v1 is updated with the value of
a - which is 100.
int a = 100; v4int32 v1 = upd_elem(undef_v4int32(), 0, a);
important use is to move data to the scalar unit and do an inverse or
sqrt. In the following example, the 0th element of vector
vf is extracted and stored in the scalar variable
v4float vf; float f=ext_elem(vf,0); float i_f=invsqrt(f);
shft_elem() intrinsic function
can be used to update a vector by inserting a new element at the beginning of a
vector and shifting the other elements by one.