void bli_syr2k_front( obj_t* alpha,
obj_t* a,
obj_t* b,
obj_t* beta,
obj_t* c,
herk_t* cntl )
{
obj_t c_local;
obj_t a_local;
obj_t bt_local;
obj_t b_local;
obj_t at_local;
// Check parameters.
if ( bli_error_checking_is_enabled() )
bli_syr2k_check( alpha, a, b, beta, c );
// If alpha is zero, scale by beta and return.
if ( bli_obj_equals( alpha, &BLIS_ZERO ) )
{
bli_scalm( beta, c );
return;
}
// Alias A, B, and C in case we need to apply transformations.
bli_obj_alias_to( *a, a_local );
bli_obj_alias_to( *b, b_local );
bli_obj_alias_to( *c, c_local );
bli_obj_set_as_root( c_local );
// For syr2k, the first and second right-hand "B" operands are simply B'
// and A'.
bli_obj_alias_to( *b, bt_local );
bli_obj_induce_trans( bt_local );
bli_obj_alias_to( *a, at_local );
bli_obj_induce_trans( at_local );
// An optimization: If C is row-stored, transpose the entire operation
// so as to allow the macro-kernel more favorable access patterns
// through C. (The effect of the transposition of A and A' is negligible
// because those operands are always packed to contiguous memory.)
if ( bli_obj_is_row_stored( c_local ) )
{
bli_obj_induce_trans( c_local );
}
#if 0
// Invoke the internal back-end.
bli_her2k_int( alpha,
&a_local,
&bt_local,
alpha,
&b_local,
&at_local,
beta,
&c_local,
cntl );
#else
// Invoke herk twice, using beta only the first time.
bli_herk_int( alpha,
&a_local,
&bt_local,
beta,
&c_local,
cntl );
bli_herk_int( alpha,
&b_local,
&at_local,
&BLIS_ONE,
&c_local,
cntl );
#endif
}
void bli_syr2k_front
(
obj_t* alpha,
obj_t* a,
obj_t* b,
obj_t* beta,
obj_t* c,
cntx_t* cntx,
cntl_t* cntl
)
{
bli_init_once();
obj_t c_local;
obj_t a_local;
obj_t bt_local;
obj_t b_local;
obj_t at_local;
// Check parameters.
if ( bli_error_checking_is_enabled() )
bli_syr2k_check( alpha, a, b, beta, c, cntx );
// If alpha is zero, scale by beta and return.
if ( bli_obj_equals( alpha, &BLIS_ZERO ) )
{
bli_scalm( beta, c );
return;
}
// Alias A, B, and C in case we need to apply transformations.
bli_obj_alias_to( a, &a_local );
bli_obj_alias_to( b, &b_local );
bli_obj_alias_to( c, &c_local );
bli_obj_set_as_root( &c_local );
// For syr2k, the first and second right-hand "B" operands are simply B'
// and A'.
bli_obj_alias_to( b, &bt_local );
bli_obj_induce_trans( &bt_local );
bli_obj_alias_to( a, &at_local );
bli_obj_induce_trans( &at_local );
// An optimization: If C is stored by rows and the micro-kernel prefers
// contiguous columns, or if C is stored by columns and the micro-kernel
// prefers contiguous rows, transpose the entire operation to allow the
// micro-kernel to access elements of C in its preferred manner.
if ( bli_cntx_l3_ukr_dislikes_storage_of( &c_local, BLIS_GEMM_UKR, cntx ) )
{
bli_obj_induce_trans( &c_local );
}
// Record the threading for each level within the context.
bli_cntx_set_thrloop_from_env( BLIS_SYR2K, BLIS_LEFT, cntx,
bli_obj_length( &c_local ),
bli_obj_width( &c_local ),
bli_obj_width( &a_local ) );
// Invoke herk twice, using beta only the first time.
// Invoke the internal back-end.
bli_l3_thread_decorator
(
bli_gemm_int,
BLIS_HERK, // operation family id
alpha,
&a_local,
&bt_local,
beta,
&c_local,
cntx,
cntl
);
bli_l3_thread_decorator
(
bli_gemm_int,
BLIS_HERK, // operation family id
alpha,
&b_local,
&at_local,
&BLIS_ONE,
&c_local,
cntx,
cntl
);
}
