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/*
-- MAGMA (version 2.5.4) --
Univ. of Tennessee, Knoxville
Univ. of California, Berkeley
Univ. of Colorado, Denver
@date October 2020
@author Mark Gates
@generated from control/magma_zauxiliary.cpp, normal z -> c, Thu Oct 8 23:05:22 2020
*/
#include "magma_internal.h"
#define PRECISION_c
/***************************************************************************//**
Purpose
-------
This deals with a subtle bug with returning lwork as a Float.
If lwork > 2**24, then it will get rounded as a Float;
we need to ensure it is rounded up instead of down,
by multiplying by 1.+eps in Double precision:
float( 16777217 ) == 16777216
float( 16777217 * (1.+eps) ) == 16777218
where eps is Single precision machine epsilon.
(Could use 1+2*eps in Single precision, but that can add more than necesary.)
If lwork > 2**53, rounding would happen in Double, too, but that's 94M x 94M!
@param[in]
lwork Workspace size.
@return lwork, converted to magmaFloatComplex and rounded up slightly
if necesary so that returned lwork >= input lwork.
@ingroup magma_make_lwork
*******************************************************************************/
magmaFloatComplex magma_cmake_lwork( magma_int_t lwork )
{
#if defined(PRECISION_s) || defined(PRECISION_c)
real_Double_t one_eps = 1. + lapackf77_slamch("Epsilon");
return MAGMA_C_MAKE( float(lwork*one_eps), 0 );
#else
return MAGMA_C_MAKE( float(lwork), 0 );
#endif
}
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