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73 lines
2.4 KiB
73 lines
2.4 KiB
4 years ago
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#include "f2c.h"
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#include <float.h>
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#include <stdio.h>
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/* *********************************************************************** */
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double dlamc3_(double *a, double *b)
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{
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/* -- LAPACK auxiliary routine (version 3.1) -- */
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/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
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/* November 2006 */
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/* .. Scalar Arguments .. */
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/* .. */
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/* Purpose */
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/* ======= */
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/* DLAMC3 is intended to force A and B to be stored prior to doing */
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/* the addition of A and B , for use in situations where optimizers */
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/* might hold one of these in a register. */
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/* Arguments */
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/* ========= */
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/* A (input) DOUBLE PRECISION */
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/* B (input) DOUBLE PRECISION */
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/* The values A and B. */
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/* ===================================================================== */
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/* .. Executable Statements .. */
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double ret_val = *a + *b;
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return ret_val;
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/* End of DLAMC3 */
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} /* dlamc3_ */
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/* simpler version of dlamch for the case of IEEE754-compliant FPU module by Piotr Luszczek S.
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taken from http://www.mail-archive.com/numpy-discussion@lists.sourceforge.net/msg02448.html */
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#ifndef DBL_DIGITS
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#define DBL_DIGITS 53
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#endif
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static const unsigned char lapack_dlamch_tab0[] =
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{
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 0, 0, 0, 0, 3, 4, 5, 6, 7, 0, 8, 9, 0, 10, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 0, 0, 0, 0, 3, 4, 5, 6, 7, 0, 8, 9,
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0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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const double lapack_dlamch_tab1[] =
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{
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0, FLT_RADIX, DBL_EPSILON, DBL_MAX_EXP, DBL_MIN_EXP, DBL_DIGITS, DBL_MAX,
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DBL_EPSILON*FLT_RADIX, 1, DBL_MIN*(1 + DBL_EPSILON), DBL_MIN
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};
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double dlamch_(char* cmach)
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{
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return lapack_dlamch_tab1[lapack_dlamch_tab0[(unsigned char)cmach[0]]];
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}
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