Are you sure there is only one copy of salflibc on the machine (and it is the one you expect it to be)? Since many many floating-point operations can give inexact results, including conversion from string, I'd imagine that a typical program using floating-point would be unusable with that flag set. –Mark Dickinson Apr org: nasa, domain: gov | -- Mark Twain Top Floating point stack fault by Steve Lion » Sun, 20 Jul 2003 01:53:09 Just as a point of reference: Only difference is the representation. have a peek at this web-site
If I've (or we've [the CVF/Intel Fortran team]) done something to offend you, please let me know privately. If you try to pop something and the stack is empty, you get a FP stack check. The reason I ask is that the C DLL is new, and the FTN code has been running fine without it. Back to top JohnMansellJoined: 10 May 2006Posts: 18Location: Darlington Posted: Thu Oct 07, 2010 8:09 am Post subject: I have discovered the cause of the floating point stack fault.
Integer overflow does exist; many (most) hardware doesn't detect it, so detection tends to need significant software work, but it is at least a relevant concept. -- Richard Maine | Good You would have found the normal libm version of sqrt which returned a float but never got it popped off (nor would the return value be correct.) Glad to hear that It seems like the IO operations change the FPU control word temporarily thus the still-existing FPU exception flag causes a program exception.
Furthermore, "integer underflow" does not exist. I don't know what's causing it. The terms "overflow/underflow" refer to the condition - *NOT* to the result. etc..
Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 YearOldest FirstNewest First forums.silverfrost.com Forum Index -> Support All times are GMT + 1 Hour If they don't., the results are unpredictable. The caller is supposed to pop it off. When I run the crashing program via sdbg, it crashes with floating point error in a routine that reads an integer array from a disk file (NOT the place reported in
This was fixed in 2011, nowadays gfortran instead uses "inexact", (while keeping "precision" as an alias for backwards compatibility). –janneb Apr 3 '15 at 21:38 I took out precision You can also get an error later if a value is left hanging on the FP stack. Can I increase the size of this "Floating-Point Stack", if that's what the problem is? Adrian Top Steve Lionel (Intel) Tue, 02/07/2006 - 21:54 You must have disabled the usual warnings about undeclared functions in C.
Join the community of 500,000 technology professionals and ask your questions. asked 3 years ago viewed 7521 times active 4 months ago Linked 0 Excel if equal and match are not return the same thing Related 1288Is floating point math broken?94In which New Posts Battlefield 1 releasing October 18th. Someone else, responding to the original question, suggested simplifying the expression.
Top Floating point stack fault by Steve Lion » Thu, 17 Jul 2003 00:41:45 It is not the type of stack you increase the size of. http://jamisonsoftware.com/floating-point/floating-point-error.php I thought EAX was an ordinary 32-bit general purpose register. If you reject this answer, please mention the questions I asked at the top of this answer.. 0 Write Comment First Name Please enter a first name Last Name Please enter Intel Fortran does not presently have an option to detect integer overflow.
I set the environment variable SALFENVAR=MASK_UNDERFLOW. Not including math.h would not cause the linker to fail. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Source Latest: sze5003, Oct 15, 2016 at 5:26 PM PC Gaming 1:38 Way to go Nvidia wait time on live chat then all of sudden 7:31 Latest: zinfamous, Oct 15, 2016 at
The compiler has to generate extra code (and sometimes different code) to detect overflow. Useful Searches Recent Posts Menu Forums Forums Quick Links Search Forums Recent Posts Menu Log in Sign up AnandTech Forums: Technology, Hardware, Software, and Deals Forums > Hardware and Technology > When overflow detection is enabled and an overflow is detected, you get an exception, and the result stored is unpredictable.
If Dumbledore is the most powerful wizard (allegedly), why would he work at a glorified boarding school? How much interest should I pay on a loan from a friend? Programming Languages-Other C While-Loops Video by: Grant The goal of this video is to provide viewers with basic examples to understand and use while-loops in the C programming language. So you're back to checking the declarations manually.
Solved Floating point error: Stack Fault Posted on 1998-03-27 C 1 Verified Solution 1 Comment 814 Views Last Modified: 2009-07-29 Borland C++ When port a program from one computer to another, Can the interface between Matlab and C/Fortran be float(single precision floating point)? 12. I'm pretty sure there is only one version of salflibc.dll on that machine, though. have a peek here Both variables are declared as real(8).
Is accuracy binary? It's also wrong. Common Lisp doesn't allow integers to OVERflow, or underFLOW for that matter; it accepts reality. ifort 32-bit with no SSE options, such as -QxW, or maybe when using -Op or -fltconsistency), it looks like the compiler has exceeded the stack register size (8 items on stack).
your problem is not the same as the 1.9999.... The 0.2 is not really a 0.2, but is internally represented as a slightly different number. I don't know what C assumes for such things, but it certainly wasn't that it returns a float. Any input is appreciated.
For this reason, value / 10.0f would be marginally better. –Pascal Cuoq Feb 13 '13 at 20:30 I just checked and GCC does generate a single-precision division for float Now why it didn't fail with an unresolved external on the link of the C DLL I've no idea, but I guess it thought it had a sqrt function somewhere it To catch floating point errors, I'm using the following compiler options for gfortran 4.9.0: FFLAGS1 = -std=f2003 -ffree-form -fdefault-real-8 -fdefault-double-8 \ -Ofast -fall-intrinsics -fcheck=all -m64 \ -fno-trapping-math -c \ -ffpe-trap=invalid,zero,overflow,underflow,precision,denormal -Wall Top Floating point stack fault by Richard Ma » Sun, 20 Jul 2003 00:24:37 "Gerald F.
With FTN95 I can compile the code and I get an executable. Another possibility is incorrect generated code, but I'm inclined to suspect a coding error. You are correct in noting that overflow checking does not work for INTEGER(8) types in CVF.