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Floating Point Stack Underflow Error

as u. : SET-PRECISION ( u -- ) \ ANSI Floating ext Set the number of significant digits currently used by (F.), (FE.), (FS.), F., FE., or FS. FP Stack operations code FDROP ( fs: r -- ) \ ANSI Floating Remove r from the floating-point stack. code DF! ( addr -- ; fs: r -- ) \ ANSI Floating ext Store a 64 bit (double) float. More importantly, HOW DO I STOP IT FROM HAPPENING!?!?! navigate here

If r1 and r2 are both zero then r3 is ±zero. This function allows accurate computation when its arguments are close to zero, and provides a useful base for the standard exponential functions. FE_UNDERFLOWUnderflow range error: The result is too small in magnitude to be represented as a value of the return type. Reply With Quote 10-11-2001,06:05 PM #10 Prototype Guest Re: Floating point errors.(stack underflow) "dino" wrote: > >Please give info on which c++ compiler you are working. > >if it is

In programs written in C or C++, the C99 floating point environment functions in libm9x.so provide another. no != .NE. This function can be used to convert cartesian coordinates into the angle of the polar coordinates. Yet the problem is underflow.

On x86, the denormal operand exception can occur with any of the five standard exceptions. The three input parameters can take the following values: Input Parameter C or C++ Type Possible Value action char * get, set, clear exception char * invalid, division, overflow,
underflow, inexact,
TABLE 4-2 Unordered Comparisons Predicates Invalid Exception math c, c++ f77 (if unordered) = == .EQ. Reply With Quote 10-09-2001,08:18 PM #2 Prototype Guest Re: Floating point errors.(stack underflow) OK, "underflow" means that the value being assigned to the varible is too small.

It also contains a structure recording the default result that would have been substituted if the exception were not trapped and an integer value holding the bitwise "or" of the exception The string is not null terminated. : (F.) ( addr -- ; fs: r -- ) \ W32F Floating extra Format the top number on the floating-point stack using fixed-point notation: Furthermore, integer overflow is usually not detected. The only combinations of standard exceptions that can occur simultaneously are overflow with inexact and underflow with inexact.

fpchip_state.state[(x)] #define FPreg(x) *(long double *)(10*(x)+(char*)&uap-> uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[7]) /* * Supply the IEEE 754 default result for trapped under/overflow */ void ieee_trapped_default(int sig, siginfo_t *sip, ucontext_t *uap) { double dscl; float fscl; Float can handle numbers +or-3.4E-38 to +or-3.4E38 and Double can handle numbers +or-1.7E-308 to +or-1.7E308. code F- ( fs: r1 r2 -- r3 ) \ ANSI Floating Subtract r2 from r1. To find the instruction that caused the exception, disassemble several instructions and look for the last floating point instruction prior to the instruction at which adb has stopped.

For example, to clear the overflow exception flag from Fortran, write: character*8 out call ieee_flags('clear', 'exception', 'overflow', out) To determine whether an exception has occurred from C or C++, use: i See Also -fp-stack-check, /Qfp-stack-check option Tells the compiler to generate extra code after every function call to ensure that the floating-point stack is in the expected state. code FABS ( fs: r1 -- r2 ) \ ANSI Floating ext r2 is the absolute value of r1. You may have to register before you can post: click the register link above to proceed.

Yet the double and float will create the error. check over here on to the FP stack. The following example illustrates such a handler. How did this happen?

Social IntelliEarth Solutions Geospatial Products Custom Services IntelliEarth Marketplace Industries Defense & Intelligence Environmental Monitoring Academic Learn Videos Blogs Events & Webinars Training Case Studies Whitepapers Resources Support Forums Help Articles If the string does not represent a valid floating-point number an error is thrown. TABLE 4-1 IEEE Floating Point Exceptions IEEE Exception Reason Why This Arises Example Default Result When TrapisDisabled Invalid operation An operand is invalid for the operation about to be performed. his comment is here ieee_flags(3m) The syntax for a call to ieee_flags(3m) is: i = ieee_flags(action, mode, in, out); A program can test, set, or clear the accrued exception status flags using the ieee_flags function

The result is between ±pi/2. Hyperbolic functions such as cosh(x) can be efficiently and accurately implemented by using FEXPM1; accuracy is lost in this function for small values of x if the word FEXP is used. Every NaN compares "unordered" with everything, including itself.

In the vast majority of cases, floating-point underflow errors are harmless and can be ignored.

Or am I just doing something I shouldn`t be? Abort (See the Linker and Libraries Guide for more information about creating and preloading shared objects.) In principle, you can change the way any floating point control modes are initialized by fconstant finf ( fs: -- r ) \ W32F Floating extra Push plus infinity. 2e0 fconstant f2.0 ( fs: -- r ) \ W32F Floating extra Push floating-point 2.0. 10e0 fconstant code fLog2 ( fs: -- r ) \ W32F Floating extra Push the value of log base 10 of 2.

code FLNP1 ( fs: r1 -- r2 ) \ ANSI Floating ext r2 is the natural logarithm of the quantity r1 plus one. If r1 is ±0 then r2 is -infinity. Comput. 43 (1994), pp. 983-992.) The default exception response, status flags, and optional trapping facility of IEEE arithmetic are intended to provide a third alternative: continuing a computation in the presence weblink Conversions to the above types from floating point, double precision, complex, and string types do not check for overflow—they simply convert the operand to the target integer type, discarding any significant

Everytime the program reaches the floating-point varibles, I get a Floating-Point:Stack Underflow error. The following might be a typical result example% adb a.out :r . SIGFPE: Arithmetic Exception (invalid floating point operation) stopped at sqrtm1_+0x13: faddp %st,%st(1) sqrtm1_?8i sqrtm1_: sqrtm1_: pushl %ebp movl %esp,%ebp subl $0x24,%esp fldl $0x8048b88 movl 0x8(%ebp),%eax fldl (%eax) fsqrt faddp %st,%st(1) The result for |x| >1 is NAN code FATAN ( fs: r1 -- r2 ) \ ANSI Floating ext r2 is the radian angle whose tangent is r1.

As described above, ieee_flags or the C99 floating point environment functions can be used to detect exceptions after the fact, and ieee_handler or fex_set_handling can be used to enable trapping and Forum New Posts FAQ Calendar Community Groups Forum Actions Mark Forums Read Quick Links Today's Posts View Site Leaders What's New?