06-02-2014
Quote:
Originally Posted by
915086731
After the above "fldl (%eax) " executed, the content of register st0 is 0x8000000000000000, which represents NaN.
I don't really know this assembly language, but I looked up fldl and my source said it is a floating double load. The only reasons that I can think of for that to result in a NAN are:
1. There really was a NAN there to load
2. The address in question is not correctly aligned in core to be treated as a double.
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LEARN ABOUT CENTOS
infinity
INFINITY(3) Linux Programmer's Manual INFINITY(3)
NAME
INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating-point constants
SYNOPSIS
#define _ISOC99_SOURCE /* See feature_test_macros(7) */
#include <math.h>
INFINITY
NAN
HUGE_VAL
HUGE_VALF
HUGE_VALL
DESCRIPTION
The macro INFINITY expands to a float constant representing positive infinity.
The macro NAN expands to a float constant representing a quiet NaN (when supported). A quiet NaN is a NaN ("not-a-number") that does not
raise exceptions when it is used in arithmetic. The opposite is a signaling NaN. See IEC 60559:1989.
The macros HUGE_VAL, HUGE_VALF, HUGE_VALL expand to constants of types double, float and long double, respectively, that represent a large
positive value, possibly plus infinity.
CONFORMING TO
C99.
AVAILABILITY
On a glibc system, the macro HUGE_VAL is always available. Availability of the NAN macro can be tested using #ifdef NAN, and similarly for
INFINITY, HUGE_VALF, HUGE_VALL. They will be defined by <math.h> if _ISOC99_SOURCE or _GNU_SOURCE is defined, or __STDC_VERSION__ is
defined and has a value not less than 199901L.
SEE ALSO
fpclassify(3), math_error(7)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2007-07-26 INFINITY(3)