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  • Why is FLD1 loading NaN instead?

    - by Bernd Jendrissek
    I have a one-liner C function that is just return value * pow(1.+rate, -delay); - it discounts a future value to a present value. The interesting part of the disassembly is 0x080555b9 : neg %eax 0x080555bb : push %eax 0x080555bc : fildl (%esp) 0x080555bf : lea 0x4(%esp),%esp 0x080555c3 : fldl 0xfffffff0(%ebp) 0x080555c6 : fld1 0x080555c8 : faddp %st,%st(1) 0x080555ca : fxch %st(1) 0x080555cc : fstpl 0x8(%esp) 0x080555d0 : fstpl (%esp) 0x080555d3 : call 0x8051ce0 0x080555d8 : fmull 0xfffffff8(%ebp) While single-stepping through this function, gdb says (rate is 0.02, delay is 2; you can see them on the stack): (gdb) si 0x080555c6 30 return value * pow(1.+rate, -delay); (gdb) info float R7: Valid 0x4004a6c28f5c28f5c000 +41.68999999999999773 R6: Valid 0x4004e15c28f5c28f6000 +56.34000000000000341 R5: Valid 0x4004dceb851eb851e800 +55.22999999999999687 R4: Valid 0xc0008000000000000000 -2 =R3: Valid 0x3ff9a3d70a3d70a3d800 +0.02000000000000000042 R2: Valid 0x4004ff147ae147ae1800 +63.77000000000000313 R1: Valid 0x4004e17ae147ae147800 +56.36999999999999744 R0: Valid 0x4004efb851eb851eb800 +59.92999999999999972 Status Word: 0x1861 IE PE SF TOP: 3 Control Word: 0x037f IM DM ZM OM UM PM PC: Extended Precision (64-bits) RC: Round to nearest Tag Word: 0x0000 Instruction Pointer: 0x73:0x080555c3 Operand Pointer: 0x7b:0xbff41d78 Opcode: 0xdd45 And after the fld1: (gdb) si 0x080555c8 30 return value * pow(1.+rate, -delay); (gdb) info float R7: Valid 0x4004a6c28f5c28f5c000 +41.68999999999999773 R6: Valid 0x4004e15c28f5c28f6000 +56.34000000000000341 R5: Valid 0x4004dceb851eb851e800 +55.22999999999999687 R4: Valid 0xc0008000000000000000 -2 R3: Valid 0x3ff9a3d70a3d70a3d800 +0.02000000000000000042 =R2: Special 0xffffc000000000000000 Real Indefinite (QNaN) R1: Valid 0x4004e17ae147ae147800 +56.36999999999999744 R0: Valid 0x4004efb851eb851eb800 +59.92999999999999972 Status Word: 0x1261 IE PE SF C1 TOP: 2 Control Word: 0x037f IM DM ZM OM UM PM PC: Extended Precision (64-bits) RC: Round to nearest Tag Word: 0x0020 Instruction Pointer: 0x73:0x080555c6 Operand Pointer: 0x7b:0xbff41d78 Opcode: 0xd9e8 After this, everything goes to hell. Things get grossly over or undervalued, so even if there were no other bugs in my freeciv AI attempt, it would choose all the wrong strategies. Like sending the whole army to the arctic. (Sigh, if only I were getting that far.) I must be missing something obvious, or getting blinded by something, because I can't believe that fld1 should ever possibly fail. Even less that it should fail only after a handful of passes through this function. On earlier passes the FPU correctly loads 1 into ST(0). The bytes at 0x080555c6 definitely encode fld1 - checked with x/... on the running process. What gives?

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  • Content controls have to be top-level controls

    - by horatio
    I have a website that can be accessed from www.blahblah.com and special.blahblah.com. The www site always works but occasionly I get a 'Content controls have to be top-level controls in a content page or a nested master page that references a master page' error on the special site. It's exactly the same code running in both situations and the offending page doesn't even have a master page. Why would it work all the time on one and fail sometimes on the other?

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  • When should I add a file reference to a Delphi project ?

    - by Roland Bengtsson
    Unit files for standard VCL files like Dialogs, StringUtils etc is never referenced in a projects DPR-file. But when should I add a reference to the DPR-file ? Now I have own sourcefiles and source of own components. What about source files for Ravereport, Devexpress, Indy, Gnostice etc ? I want as fast codeinsight as possible, but of course I do not want to add bloat to the DPR-file. I use Delphi 2007 Regards

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  • Printing a Project in NetBeans

    - by Infestor
    i have an exam and i would like to print my java (in netbeans project) files as fast as possible. i was wondering is there a way to print an entire project/project in netbeans with one click? or do you have a better suggestion? (i will be using windows xp and there is no nice editor like gedit installed)

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  • Using jquery to prevent resubmitting form

    - by Tony
    I use jquery's .submit() to intercept user's submit event, however I found a problem. When the user single click the submit button, the form is submitted normally, but if a user deliberately fast click it multiple times, it will submit multiple times, which will cause duplicated data in the database. What's the solution for this kind of problem ?

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  • How can I stop cruise control re-building after a failed build?

    - by RodeoClown
    I got back from the weekend to discover that somebody *ahem* had missed a file commit last thing Friday afternoon... Cruise control has been having fun, and tried to re-build every five minutes since then despite no further commits. This means that my colleagues and I have received approximately six hojillion emails from cruise control. A single fail email would be more than enough to notify us. Is there any way to stop cruise control building on failure, at least until a new commit occurs?

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  • Modify a php limit text function adding some kind of offset to it

    - by webmasters
    Maybe you guys can help: I have a variable called $bio with bio data. $bio = "Hello, I am John, I'm 25, I like fast cars and boats. I work as a blogger and I'm way cooler then the author of the question"; I search the $bio using a set of functions to search for a certain word, lets say "author" which adds a span class around that word, and I get: $bio = "Hello, I am John, I'm 25, I like fast cars and boats. I work as a blogger and I'm way cooler then the <span class=\"highlight\">author</span> of the question"; I use a function to limit the text to 85 chars: $bio = limit_text($bio,85); The problem is when there are more then 80 chars before the word "author" in $bio. When the limit_text() is applied, I won't see the highlighted word author. What I need is for the limit_text() function to work as normal, adding all the words that contain the span class highlight at the end. Something like this: *"This is the limited text to 85 chars, but there are no words with the span class highlight so I am putting to be continued ... **author**, **author2** (and all the other words that have a span class highlight around them separate by comma "* Hope you understood what I mean, if not, please comment and I'll try to explain better. Here is my limit_text() function: function limit_text($text, $length){ // Limit Text if(strlen($text) > $length) { $stringCut = substr($text, 0, $length); $text = substr($stringCut, 0, strrpos($stringCut, ' ')); } return $text; } UPDATE: $xturnons = str_replace(",", ", ", $xturnons); $xbio = str_replace(",", ", ", $xbio); $xbio = customHighlights($xbio,$toHighlight); $xturnons = customHighlights($xturnons,$toHighlight); $xbio = limit_text($xbio,85); $xturnons = limit_text($xturnons,85); The customHighlights function which adds the span class highlighted: function addRegEx($word){ // Highlight Words return "/" . $word . '[^ ,\,,.,?,\.]*/i'; } function highlight($word){ return "<span class='highlighted'>".$word[0]."</span>"; } function customHighlights($searchString,$toHighlight){ $searchFor = array_map('addRegEx',$toHighlight); $result = preg_replace_callback($searchFor,'highlight',$searchString); return $result; }

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  • How do I get the CPU speed and total physical ram in C#?

    - by edude05
    I need a simple way of checking how much ram and fast the CPU of the host PC is. I tried WMI however the code I'm using private long getCPU() { ManagementClass mObject = new ManagementClass("Win32_Processor"); mObject.Get(); return (long)mObject.Properties["MaxClockSpeed"].Value; } Throws a null reference exception. Furthermore, WMI queries are a bit slow and I need to make a few to get all the specs. Is there a better way?

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  • How do I build git on Red Hat EL 3?

    - by Steve Hanov
    When you try to build git on Red Hat Enterprise Linux 3, you get an error: In file included from /usr/include/openssl/ssl.h:179, from git-compat-util.h:139, from builtin.h:4, from fast-import.c:147: /usr/include/openssl/kssl.h:72:18: krb5.h: No such file or directory

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  • Discover NullPointerException bugs using FindBug

    - by alex2k8
    When I run FindBug on this code, it reports NO issues. boolean _closed = false; public void m1(@Nullable String text) { if(_closed) return; System.out.println(text.toLowerCase()); } While here it finds issue as expected: public void m1(@Nullable String text) { System.out.println(text.toLowerCase()); // FireBug: text must be nonnull but is marked as nullable } Why does it fail in first case?

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  • If as assert fails, is there a bug?

    - by RichAmberale
    I've always followed the logic: if assert fails, then there is a bug. Root cause could either be: Assert itself is invalid (bug) There is a programming error (bug) (no other options) I.E. Are there any other conclusions one could come to? Are there cases where an assert would fail and there is no bug?

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  • Most interesting and challenging programming tasks

    - by dsimcha
    Some programmers enjoy optimizing code to make the implementation as fast as humanly possible; or golfing to make code as compact as possible. Others enjoy metaprogramming to make code generic, or designing algorithms to be asymptotically efficient. What do you find most interesting and challenging as a programmer?

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  • What is so bad about Singletons

    - by Ewan Makepeace
    The Singleton pattern is a fully paid up member of the GoF Patterns Book but lately seems rather orphaned by the developer world. I still use quite a lot of singletons, especially for Factory classes, and while you have to be a bit careful about multithreading issues (like any class actually) fail to see why they are so awful. This site especially seems to assume that everyone agrees that Singletons are evil. Why?

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  • JVM performance test suite

    - by pierr
    Hi, I have just ported phoneME to our MIPS platform. I feel it runs not that fast; however, is there any performance test suite I can run against to get some quantitative measurement of the performance? I might need to pick some weak points for optimization. In addition, what are common criterions used to evalute a JVM ?

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  • slowness in IE 8 IE9 while drawing tables in a html page

    - by GustlyWind
    My HTML page contains many tables,with numerous tr and td. While rendering in IE8/IE9 the its very slow but in Firefox its fast. I had read somewhere while drawing tables if the tables are not of fixed width, IE calculates the width every time and renders so usually slow. Right now i am adding Table style="table-layout:fixed" which made me feel its faster. Are there any similar styles that can be added to tr and td as well.Also suggest if there any other attribtes that can be added to a table

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  • Is there a good radixsort-implementation for floats in C#

    - by CommuSoft
    I have a datastructure with a field of the float-type. A collection of these structures needs to be sorted by the value of the float. Is there a radix-sort implementation for this. If there isn't, is there a fast way to access the exponent, the sign and the mantissa. Because if you sort the floats first on mantissa, exponent, and on exponent the last time. You sort floats in O(n).

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  • file output in python giving me garbage

    - by Richard
    When I write the following code I get garbage for an output. It is just a simple program to find prime numbers. It works when the first for loops range only goes up to 1000 but once the range becomes large the program fail's to output meaningful data output = open("output.dat", 'w') for i in range(2, 10000): prime = 1 for j in range(2, i-1): if i%j == 0: prime = 0 j = i-1 if prime == 1: output.write(str(i) + " " ) output.close() print "writing finished"

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  • assistance required, hangman game.

    - by Phillip Gibson
    I am making a hangman game and am having trouble with part of it. I have selected a random word from a file, but I want to display the word as a series of undersocres __ and then match the letter chosen to a position in the undersocres. Can anyone help me? cout <<"1. Select to play the game\n"; cout <<"2. Ask for help\n"; cout <<"3. Select to quit the game\n"; cout << "Enter a selection: "; int number; cin >> number; while(number < 1 || number > 3 || cin.fail()) { if(cin.fail()) { cin.sync(); cin.clear(); cout << "You have not entered a number, please enter a menu selection between 1 and 3\n"; cin >> number; } else { cout << "Your selection must be between 1 and 3!\n"; cin >> number; } } switch (number) { case 1: { string word; string name; cout << " Whats your name? "; cin >> name; Player player(); ifstream FileReader; FileReader.open("words.txt"); if(!FileReader.is_open()) cout << "Error"; //this is for the random selection of words srand(time(0)); int randnum = rand()%10+1; for(int counter = 0; counter < randnum; counter++) { getline(FileReader, word, '\n'); } cout << "my word: " << word << "\n"; // get length of word int length; //create for loop for(int i = 0; i < length; i++) cout << "_"; //_ _ _ _ _ SetCursorPos(2,10); FileReader.close(); break;

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  • Why are joins bad when considering scalability?

    - by acidzombie24
    Why are joins bad or 'slow'. I know i heard this more then once. I found this quote The problem is joins are relatively slow, especially over very large data sets, and if they are slow your website is slow. It takes a long time to get all those separate bits of information off disk and put them all together again. source I always thought they were fast especially when looking up a PK. Why are they 'slow'?

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  • Exemple where TYPE_ALIGNMENT() fails

    - by JustMaximumPower
    Hi, I have a question relating to alignment in c/c++. In http://stackoverflow.com/questions/364483/determining-the-alignment-of-c-c-structures-in-relation-to-its-members Michael Burr posted this Makro: #define TYPE_ALIGNMENT( t ) offsetof( struct { char x; t test; }, test ) in the comments someone wrote this might fail with non POD typs. Can someone give me an code example where this fails?

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  • .live event doesnt work till second click

    - by ChampionChris
    I have 2 list on a page that are linked. When I drag a li element from list 1 to list 2 the live events on list 1 don't work on the first click only second click. Below is the code that adds the li (obj) to list 2. function AddToDropBox(obj) { $(obj).children(".handle").animate({ width: "20px" }).children("strong").fadeOut(); $(obj).children("span:not(.track,.play,.handle,:has(.btn-edit))").fadeOut('fast'); $(obj).children(".play").css("margin-right", "8px"); $(obj).css({ "opacity": "0.0", "width": "284px" }).animate({ opacity: "1.0" }); if ($(".sidebar-drop-box ul").children(".admin-song").length > 0) { $(".dropTitle").fadeOut("fast"); $(".sidebar-drop-box ul.admin-song-list").css("min-height", "0"); } if (typeof SetLinks == 'function') { SetLinks(); } //CBG Changes adds media ID to hidden field //checks id there is a value in field then adds comma if(document.getElementById("ctl00_cphBody_hfRemoveMedia").value==""||document.getElementById("ctl00_cphBody_hfRemoveMedia").value==null) { document.getElementById("ctl00_cphBody_hfRemoveMedia").value=(obj).attr("mediaid"); } else { var localMediaIDs=document.getElementById("ctl00_cphBody_hfRemoveMedia").value; document.getElementById("ctl00_cphBody_hfRemoveMedia").value=localMediaIDs+", "+(obj).attr("mediaid"); } // alert("hfid: "+document.getElementById("ctl00_cphBody_hfRemoveMedia").value); //END CBG Modifications } this is one of the live() events that dont fire until the second click after the drag. This live() event is in a document.ready function(). // Live for deleting. $(".btn-del").live("click", function(e) { DeleteItem(this); $(this).removeClass("btn-del").addClass("btn-add").parents("li").removeClass("alt").addClass("removed"); var oldTxt = $(this).parents("li").find(".status").text(); $(this).parents("li").find(".status").text("Removed").attr("oldstat", oldTxt); $("#timeHolder input[type=hidden]").val(($("#timeHolder input[type=hidden]").val() * 1) - ($(this).parents("li").find(".time").attr("length") * 1)); CalculateAggregates(); isDirty = false; }); EDIT @dreaton.. Im new to jquery and javascript so thanks for the last tip... Im not sure what you mean about cache the query's. ... the delegete feature is giving me this Microsoft JScript runtime error: Object doesn't support this property or method this is the way I have the code $('#ulPlaylist').delegate('.btn-del', 'click', function (e) { DeleteItem(this); $(this).removeClass("btn-del").addClass("btn-add").parents("li").removeClass("alt").addClass("removed"); var oldTxt = $(this).parents("li").find(".status").text(); $(this).parents("li").find(".status").text("Removed").attr("oldstat", oldTxt); $("#timeHolder input[type=hidden]").val(($("#timeHolder input[type=hidden]").val() * 1) - ($(this).parents("li").find(".time").attr("length") * 1)); CalculateAggregates(); isDirty = false; });

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