Update to 2.0.0 tree from current Fremantle build

[opencv] / 3rdparty / lapack / dlaisnan.c

diff --git a/3rdparty/lapack/dlaisnan.c b/3rdparty/lapack/dlaisnan.c
new file mode 100644 (file)
index 0000000..d4f1a14
--- /dev/null
+++ b/3rdparty/lapack/dlaisnan.c
@@ -0,0 +1,46 @@
+#include "clapack.h"
+
+logical dlaisnan_(doublereal *din1, doublereal *din2)
+{
+    /* System generated locals */
+    logical ret_val;
+
+
+/*  -- LAPACK auxiliary routine (version 3.1) -- */
+/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/*     November 2006 */
+
+/*     .. Scalar Arguments .. */
+/*     .. */
+
+/*  Purpose */
+/*  ======= */
+
+/*  This routine is not for general use.  It exists solely to avoid */
+/*  over-optimization in DISNAN. */
+
+/*  DLAISNAN checks for NaNs by comparing its two arguments for */
+/*  inequality.  NaN is the only floating-point value where NaN != NaN */
+/*  returns .TRUE.  To check for NaNs, pass the same variable as both */
+/*  arguments. */
+
+/*  Strictly speaking, Fortran does not allow aliasing of function */
+/*  arguments. So a compiler must assume that the two arguments are */
+/*  not the same variable, and the test will not be optimized away. */
+/*  Interprocedural or whole-program optimization may delete this */
+/*  test.  The ISNAN functions will be replaced by the correct */
+/*  Fortran 03 intrinsic once the intrinsic is widely available. */
+
+/*  Arguments */
+/*  ========= */
+
+/*  DIN1     (input) DOUBLE PRECISION */
+/*  DIN2     (input) DOUBLE PRECISION */
+/*          Two numbers to compare for inequality. */
+
+/*  ===================================================================== */
+
+/*  .. Executable Statements .. */
+    ret_val = *din1 != *din2;
+    return ret_val;
+} /* dlaisnan_ */