simdpp::store_last

 

libsimdpp

Types

Capabilities

Operations

Conversions

Bitwise operations

Floating-point operations

Integer operations

Memory access operations

Shuffle operations

Miscellaneous operations

 

Memory access operations

Load

load

load_u

load_splat

load_packed2

load_packed3

load_packed4

Store

store

stream

store_first

store_last

store_packed2

store_packed3

store_packed4

 

template<unsigned N, class V> void store_last( void* ptr, const any_vec<N,V>& a, unsigned n );

Stores the last n elements the given vector to memory block starting at ptr. n must be in range [0..N].

The function may be implemented as read-modify-write operation that behaves as if store(ptr, blend(a, (V) load(ptr), store_mask) was executed.

The function is meant to be used in loop heads. It results in several instructions and is best not used in inner loops.

V must me a non-mask vector type. ptr must be aligned to vector size.

Parameters

ptr	-	pointer to location to store data to
a	-	vector to store
n	-	the number of elements to store

Return value

(none)

Equivalent operation

*(p+0) = (n > M)   ? a0 : *(p+0)
*(p+1) = (n > M-1) ? a1 : *(p+1)
...
*(p+M) = (n > 0)   ? aM : *(p+M)

Here M = N-1.