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• Function calls in virtual machine killing performance

  - by GenTiradentes

  I wrote a virtual machine in C, which has a call table populated by pointers to functions that provide the functionality of the VM's opcodes. When the virtual machine is run, it first interprets a program, creating an array of indexes corresponding to the appropriate function in the call table for the opcode provided. It then loops through the array, calling each function until it reaches the end. Each instruction is extremely small, typically one line. Perfect for inlining. The problem is that the compiler doesn't know when any of the virtual machine's instructions are going to be called, as it's decided at runtime, so it can't inline them. The overhead of function calls and argument passing is killing the performance of my VM. Any ideas on how to get around this?

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• Creating a Hello World library function in assembly and calling it from C#

  - by Filip Ekberg

  Let's say we use NASM as they do in this answer: how to write hellow world in assembly under windows. I got a couple of thoughts and questions regarding assembly combined with c# or any other .net languages for that matter. First of all I want to be able to create a library that has the following function HelloWorld that takes this parameter: Name In C# the method signature would looke like this: void HelloWorld(string name) and it would print out something like Hello World from name I've searched around a bit but can't find that much good and clean material for this to get me started. I know some basic assembly from before mostly gasthough. So any pointers in the right direction is very much apprechiated. To sum it up Create a function in ASM ( NASM ) that takes one or more parameters Compile and create a library of the above functionality Include the library in any .net language Call the included library function Bonus features How does one handle returned values? Is it possible to write the ASM-method inline? When creating libraries in assembly or c, you do follow a certain "pre defined" way, the c calling convetion, correct?

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• Help with Assembly/SSE Multiplication

  - by Brett

  I've been trying to figure out how to gain some improvement in my code at a very crucial couple lines: float x = a*b; float y = c*d; float z = e*f; float w = g*h; all a, b, c... are floats. I decided to look into using SSE, but can't seem to find any improvement, in fact it turns out to be twice as slow. My SSE code is: Vector4 abcd, efgh, result; abcd = [float a, float b, float c, float d]; efgh = [float e, float f, float g, float h]; _asm { movups xmm1, abcd movups xmm2, efgh mulps xmm1, xmm2 movups result, xmm1 } I also attempted using standard inline assembly, but it doesn't appear that I can pack the register with the four floating points like I can with SSE. Any comments, or help would be greatly appreciated, I mainly need to understand why my calculations using SSE are slower than the serial C++ code? I'm compiling in Visual Studio 2005, on a Windows XP, using a Pentium 4 with HT if that provides any additional information to assit. Thanks in advance!

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• gcc -finline-functions behaviour?

  - by user176168

  I'm using gcc with the -finline-functions optimization for release builds. In order to combat code bloat because I work on an embedded system I want to say don't inline particular functions. The obvious way to do this would be through function attributes ie attribute(noinline). The problem is this doesn't seem to work when I switch on the global -finline-functions optimisation which is part of the -O3 switch. It also has something to do with it being templated as a non templated version of the same function doesn't get inlined which is as expected. Has anybody any idea of how to control inlining when this global switch is on? Here's the code: #include <cstdlib> #include <iostream> using namespace std; class Base { public: template<typename _Type_> static _Type_ fooT( _Type_ x, _Type_ y ) __attribute__ (( noinline )); }; template<typename _Type_> _Type_ Base::fooT( _Type_ x, _Type_ y ) { asm(""); return x + y; } int main(int argc, char *argv[]) { int test = Base::fooT( 1, 2 ); printf( "test = %d\n", test ); system("PAUSE"); return EXIT_SUCCESS; }

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• Putting all methods in class definition

  - by Amnon

  When I use the pimpl idiom, is it a good idea to put all the methods definitions inside the class definition? For example: // in A.h class A { class impl; boost::scoped_ptr<impl> pimpl; public: A(); int foo(); } // in A.cpp class A::impl { // method defined in class int foo() { return 42; } // as opposed to only declaring the method, and defining elsewhere: float bar(); }; A::A() : pimpl(new impl) { } int A::foo() { return pimpl->foo(); } As far as I know, the only problems with putting a method definition inside a class definition is that (1) the implementation is visible in files that include the class definition, and (2) the compiler may make the method inline. These are not problems in this case since the class is defined in a private file, and inlining has no effect since the methods are called in only one place. The advantage of putting the definition inside the class is that you don't have to repeat the method signature. So, is this OK? Are there any other issues to be aware of?

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• What is best way to manage all images in a big project, inline images, background images, css sprite images?

  - by metal-gear-solid

  How do you manage all images in a big project, inline images, background images, css sprite images? Do you follow any naming convention? Do you create sub-folders to manage images? In a big project how to make it easy to find for new people in the development team if any images which they want to use (because it's in new PSD they received from designer) is already available in images folder of project and how they can find it easily.

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• How can I set the size of the gap between inline elements in CSS?

  - by Val M

  I am creating an MVC 1.0 form to use in multiple views. I have some elements that need to be shown on the same line, and I have done this by setting the display to "display: inline" for the style. I have also added the margin-left setting to the CSS in order to force the gap between the inline elements but this doesn't appear to be being set. My CSS has: fieldset label.inline { display: inline; margin-left: 2em; } The view code is: <fieldset> <legend>Details</legend> <p> <label for="StartTime">Start Time:</label> <%= Html.TextBox("StartTime", Model.StartTime.ToShortTimeString())%> <label for="NextDay" class="inline">Next Day?</label> <%= Html.CheckBox("NextDay") %> <%= Html.ValidationMessage("StartTime", "*")%> </p> </fieldset> Setting the size in the "margin-left" style has no impact on the space between the StartTime control and the NextDay label. How can I create this gap between the elements?

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• Why will show() only work for fields that are hidden using inline css?

  - by Chris

  I am hiding an element using inline css, like so: <span class="hidden-nojs" style="display:none">Some text</span> Next I use jQuery to show the element, like so: $(".hidden-nojs").show(); This works great. As soon as I remove the inline css and put display:none on the external css stylesheet for the hidden-nojs class, it stops working. This is what I wrote in the external stylesheet: .hidden-nojs { display: none; } I'm assuming that the external stylesheet loads after the jQuery has already run? This is somewhat annoying as I would like to hide multiple elements with css and would like to avoid using inline css. Why will show() only work for fields that are hidden using inline css? How can I fix this problem?

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• How to center text in an inline-block span on lte firefox 2?

  - by Knu

  I have 3 spans inside a div. text-align:center isn't working (tried on the parent too) text-align: -moz-center neither (on ff2) i have to use spans no floats -moz-inline-box or -moz-inline-stack ? with -moz-inline-block it's working but the 2nd and 3rd spans clear left… Anyone got an idea? (fixing #6 is an alternative)

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• Tool to automate converting inline css to external css?

  - by Tony_Henrich

  I am working on a site which is full of inline css. Is there a tool to automatically refactor the pages so that inline css is moved to an external css file? Preferably doing this in a smart way where it doesn't create duplicate css declarations so if I have two inline css like style="left-padding; 12px", it creates one css class instead of two? Adobe Dreamweaver can do this manually one inline css at a time. I prefer a tool to do all the work in one shot.

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• Blogger Template: How is inline style tag getting attached to img? [migrated]

  - by john Smith

  Examining a blogger template's img tag (data:post.thumbnailUrl) i've approached a mystery. An inline style tag controlling the width, margin and heigh perimeters are getting added to my img element. They are auto adjusting the images ratio to fit a smaller size. But I can't figure-out where this style tag script lives and how it's happening in my template. My template has no special javascript or jquery scripts. The full size images in the single posts page don't have this style tag. Is this a css or xml feature? element.style { margin-top: 0px; width: 301.0033444816054px; height: 200px; margin-left: -0.5016722408026908px; }

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• Keeping the row in edit mode after saveRow in jqgrid

  - by Chirantan

  I want to be able to keep the row in edit mode even after calling saveRow() function in jQgrid. This is because I want to be able to validate the data being saved and remove the edit mode only when the data has passed its validations. I am aware of the succesfunc, which gets called after successful posting of data. I get the response handle too, however, manually calling the editRow(row_id); function does not seem to work. Is there anyway, I can keep the row in edit mode after calling saveRow?

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• MVC 2: Html.TextBoxFor, etc. in VB.NET 2010

  - by Brian

  Hello, I have this sample ASP.NET MVC 2.0 view in C#, bound to a strongly typed model that has a first name, last name, and email: <div> First: <%= Html.TextBoxFor(i => i.FirstName) %> <%= Html.ValidationMessageFor(i => i.FirstName, "*") %> </div> <div> Last: <%= Html.TextBoxFor(i => i.LastName) %> <%= Html.ValidationMessageFor(i => i.LastName, "*")%> </div> <div> Email: <%= Html.TextBoxFor(i => i.Email) %> <%= Html.ValidationMessageFor(i => i.Email, "*")%> </div> I converted it to VB.NET, seeing the appropriate constructs in VB.NET 10, as: <div> First: <%= Html.TextBoxFor(Function(i) i.FirstName) %> <%= Html.ValidationMessageFor(Function(i) i.FirstName, "*") %> </div> <div> Last: <%= Html.TextBoxFor(Function(i) i.LastName)%> <%= Html.ValidationMessageFor(Function(i) i.LastName, "*")%> </div> <div> Email: <%= Html.TextBoxFor(Function(i) i.Email)%> <%= Html.ValidationMessageFor(Function(i) i.Email, "*")%> </div> No luck. Is this right, and if not, what syntax do I need to use? Again, I'm using ASP.NET MVC 2.0, this is a view bound to a strongly typed model... does MVC 2 still not support the new language constructs in .NET 2010? Thanks.

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• How to create a new LaTeX command that behaves something like \verb?

  - by NawaMan

  I have been using LaTeX from sometime now, but have never actually gotten my hands dirty declaring a new command, as I try to avoid that. However, I need to add monospace text often in my document and I use \verb for it which is fine, except that the verb font size is bigger than the normal text font. So I need to change the font size and undo done like \small{}\verb#My monospace code#\normalsize{}. This is not very convenient and mistake-prone. Is there a better way to do this? Can I define a new command for this? How?

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• Why is my jQuery jEditable, edit-in-place callback not working?

  - by unknowndomain

  I am using a jQuery jEditable edit-in-place field but when the JSON function returns and I try to return a value from my edit-in-place callback all I get is a flash of You can see this here... http://clareshilland.unknowndomain.co.uk/ Hit Ctrl+L to login... Username: stackoverflow Password: jquery Although you can see the script in /script.js here is the main code exerpt... $('#menu li a').editable(edit_menu_item, { cssclass: 'editable' }); Here is the callback: function edit_menu_item(value, settings) { $.ajax({ type : "POST", cache : false, url : 'ajax/menu/edit-category.php', dataType: 'json', data : { 'id': this.id, 'value': value }, success : function(data) { if (data.status == 'ok') { alert('ok'); return data.title; } else { alert('n/ok'); return this.revert; } }}); } The JSON code is here: ajax/menu.edit-category.php The edit-in-place is is on the menu which also has a jQuery sortable on it. Single click to edit. Enter to save, and it stores the data but does not update it on the edit-in-place field. Please help stackoverflow, I have been working on this for a mega age. Thanks in advance!

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• EMBED vs. OBJECT

  - by JayhawksFan93

  Which is the right/best tag to use in my HTML file when I want to display the Adobe PDF viewer? Right now I'm using the code below, but there are weird side effects (e.g. it seems to steal the starting focus that I've set to another INPUT text box; it doesn't seem to play real well with the jQueryUI Resizeable class; etc.) <embed src="abc.pdf" type="application/pdf" /> Could I even do the same thing with the OBJECT tag? Are there advantages/disadvantages to using one tag vs. the other?

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• Loading one page inside another

  - by Robin I Knight

  User 'Citizen' provided an answer to the iframe situation with the ajax script from dynamic drive. As I predicted it although it loads one page inside another it does not work with the calculation scripts, collapsible panels, validation form. All of it simply not working. I have set up a test page that has the exact same HEAD section as the page that is loaded inside it, so it is not s problem of script location. Take a look and see if you can tell me what is going on. Baring in mind this is just a test page. On the test page the entire page is loaded from another and as you can see all the collapsible panels are open, all calculations except the duration are not working because another file that is loaded by ajax on the original page is not loading in this one, the accordion menu us not working and the validation form is not validating. It is as if all script triggers have been removed and left behind but like I said the HEAD section of the parent page contains all of the scripts as well. Any ideas http://www.divethegap.com/scuba-diving-programmes-dive-the-gap/programme-pages/dahab-divemaster/test.php

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• When should you use intermediate variables for expressions?

  - by froadie

  There are times that one writes code such as this: callSomeMethod(someClass.someClassMethod()); And other times when one would write the same code like this: int result = someClass.someClassMethod(); callSomeMethod(result); This is just a basic example to illustrate the point. My question isn't if you should use an intermediate variable or not, as that depends on the code and can sometimes be a good design decision and sometimes a terrible one. The question is - when would you choose one method over the other? What factors would you consider when deciding whether to use an intermediate step? (I'd assume length and understandability of the fully inlined code would have something to do with it...)

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• CLR 4.0 inlining policy? (maybe bug with MethodImplOptions.NoInlining)

  - by ControlFlow

  I've testing some new CLR 4.0 behavior in method inlining (cross-assembly inlining) and found some strage results: Assembly ClassLib.dll: using System.Diagnostics; using System; using System.Reflection; using System.Security; using System.Runtime.CompilerServices; namespace ClassLib { public static class A { static readonly MethodInfo GetExecuting = typeof(Assembly).GetMethod("GetExecutingAssembly"); public static Assembly Foo(out StackTrace stack) // 13 bytes { // explicit call to GetExecutingAssembly() stack = new StackTrace(); return Assembly.GetExecutingAssembly(); } public static Assembly Bar(out StackTrace stack) // 25 bytes { // reflection call to GetExecutingAssembly() stack = new StackTrace(); return (Assembly) GetExecuting.Invoke(null, null); } public static Assembly Baz(out StackTrace stack) // 9 bytes { stack = new StackTrace(); return null; } public static Assembly Bob(out StackTrace stack) // 13 bytes { // call of non-inlinable method! return SomeSecurityCriticalMethod(out stack); } [SecurityCritical, MethodImpl(MethodImplOptions.NoInlining)] static Assembly SomeSecurityCriticalMethod(out StackTrace stack) { stack = new StackTrace(); return Assembly.GetExecutingAssembly(); } } } Assembly ConsoleApp.exe using System; using ClassLib; using System.Diagnostics; class Program { static void Main() { Console.WriteLine("runtime: {0}", Environment.Version); StackTrace stack; Console.WriteLine("Foo: {0}\n{1}", A.Foo(out stack), stack); Console.WriteLine("Bar: {0}\n{1}", A.Bar(out stack), stack); Console.WriteLine("Baz: {0}\n{1}", A.Baz(out stack), stack); Console.WriteLine("Bob: {0}\n{1}", A.Bob(out stack), stack); } } Results: runtime: 4.0.30128.1 Foo: ClassLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null at ClassLib.A.Foo(StackTrace& stack) at Program.Main() Bar: ClassLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null at ClassLib.A.Bar(StackTrace& stack) at Program.Main() Baz: at Program.Main() Bob: ClassLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null at Program.Main() So questions are: Why JIT does not inlined Foo and Bar calls as Baz does? They are lower than 32 bytes of IL and are good candidates for inlining. Why JIT inlined call of Bob and inner call of SomeSecurityCriticalMethod that is marked with the [MethodImpl(MethodImplOptions.NoInlining)] attribute? Why GetExecutingAssembly returns a valid assembly when is called by inlined Baz and SomeSecurityCriticalMethod methods? I've expect that it performs the stack walk to detect the executing assembly, but stack will contains only Program.Main() call and no methods of ClassLib assenbly, to ConsoleApp should be returned.

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• Exiting from the Middle of an Expression Without Using Exceptions

  - by Jon Purdy

  Is there a way to emulate the use of flow-control constructs in the middle of an expression? Is it possible, in a comma-delimited expression x, y, for y to cause a return? Edit: I'm working on a compiler for something rather similar to a functional language, and the target language is C++. Everything is an expression in the source language, and the sanest, simplest translation to the destination language leaves as many things expressions as possible. Basically, semicolons in the target language become C++ commas. In-language flow-control constructs have presented no problems thus far; it's only return. I just need a way to prematurely exit a comma-delimited expression, and I'd prefer not to use exceptions unless someone can show me that they don't have excessive overhead in this situation. The problem of course is that most flow-control constructs are not legal expressions in C++. The only solution I've found so far is something like this: try { return x(), // x(); (1 ? throw Return(0) : 0); // return 0; } catch (Return& ret) { return ref.value; } The return statement is always there (in the event that a Return construct is not reached), and as such the throw has to be wrapped in ?: to get the compiler to shut up about its void result being used in an expression. I would really like to avoid using exceptions for flow control, unless in this case it can be shown that no particular overhead is incurred; does throwing an exception cause unwinding or anything here? This code needs to run with reasonable efficiency. I just need a function-level equivalent of exit().

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• using in-line asm to write a for loop with 2 comparisons

  - by aCuria

  I want to convert the for loop in the following code into assembly but i am not sure how to start. An explanation of how to do it and why it works would be appreciated. I am using VS2010, C++, writing for the x86. The code is as follows: for (n = 0; norm2 < 4.0 && n < N; ++n) { __asm{ ///a*a - b*b + x fld a // a fmul st(0), st(0) // aa fld b // b aa fmul st(0), st(0) // bb aa fsub // (aa-bb) // st(0) - st(1) fld x // x (aa-bb) fadd // (aa-bb+x) /// 2.0*a*b + y; fld d // d (aa-bb+x) fld a // d a (aa-bb+x) fmul // ad (aa-bb+x) fld b // b ad (aa-bb+x) fmul // abd (aa-bb+x) fld y // y adb (aa-bb+x) fadd // b:(adb+y) a:(aa-bb+x) fld st(0) //b b:(adb+y) a:(aa-bb+x) fmul st(0), st(0) // bb b:(adb+y) a:(aa-bb+x) fld st(2) // a bb b:(adb+y) a:(aa-bb+x) fmul st(0), st(0) // aa bb b:(adb+y) a:(aa-bb+x) fadd // aa+bb b:(adb+y) a:(aa-bb+x) fstp norm2 // store aa+bb to norm2, st(0) is popped. fstp b fstp a } }

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• Intrinsics program (SSE) - g++ - help needed

  - by Sriram

  Hi all, This is the first time I am posting a question on stackoverflow, so please try and overlook any errors I may have made in formatting my question/code. But please do point the same out to me so I may be more careful. I was trying to write some simple intrinsics routines for the addition of two 128-bit (containing 4 float variables) numbers. I found some code on the net and was trying to get it to run on my system. The code is as follows: //this is a sample Intrinsics program to add two vectors. #include <iostream> #include <iomanip> #include <xmmintrin.h> #include <stdio.h> using namespace std; struct vector4 { float x, y, z, w; }; //functions to operate on them. vector4 set_vector(float x, float y, float z, float w = 0) { vector4 temp; temp.x = x; temp.y = y; temp.z = z; temp.w = w; return temp; } void print_vector(const vector4& v) { cout << " This is the contents of vector: " << endl; cout << " > vector.x = " << v.x << endl; cout << " vector.y = " << v.y << endl; cout << " vector.z = " << v.z << endl; cout << " vector.w = " << v.w << endl; } vector4 sse_vector4_add(const vector4&a, const vector4& b) { vector4 result; asm volatile ( "movl $a, %eax" //move operands into registers. "\n\tmovl $b, %ebx" "\n\tmovups (%eax), xmm0" //move register contents into SSE registers. "\n\tmovups (%ebx), xmm1" "\n\taddps xmm0, xmm1" //add the elements. addps operates on single-precision vectors. "\n\t movups xmm0, result" //move result into vector4 type data. ); return result; } int main() { vector4 a, b, result; a = set_vector(1.1, 2.1, 3.2, 4.5); b = set_vector(2.2, 4.2, 5.6); result = sse_vector4_add(a, b); print_vector(a); print_vector(b); print_vector(result); return 0; } The g++ parameters I use are: g++ -Wall -pedantic -g -march=i386 -msse intrinsics_SSE_example.C -o h The errors I get are as follows: intrinsics_SSE_example.C: Assembler messages: intrinsics_SSE_example.C:45: Error: too many memory references for movups intrinsics_SSE_example.C:46: Error: too many memory references for movups intrinsics_SSE_example.C:47: Error: too many memory references for addps intrinsics_SSE_example.C:48: Error: too many memory references for movups I have spent a lot of time on trying to debug these errors, googled them and so on. I am a complete noob to Intrinsics and so may have overlooked some important things. Any help is appreciated, Thanks, Sriram.

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• Is it possible to parse a stylesheet with Nokogiri?

  - by wbharding

  I've spent my requisite two hours Googling this, and I can not find any good answers, so let's see if humans can beat Google computers. I want to parse a stylesheet in Ruby so that I can apply those styles to elements in my document (to make the styles inlined). So, I want to take something like <style> .mystyle { color:white; } </style> And be able to extract it into a Nokogiri object of some sort. The Nokogiri class "CSS::Parser" (http://nokogiri.rubyforge.org/nokogiri/Nokogiri/CSS/Parser.html) certainly has a promising name, but I can't find any documentation on what it is or how it works, so I have no idea if it can do what I'm after here. My end goal is to be able to write code something like: a_web_page = Nokogiri::HTML(html_page_as_string) parsed_styles = Nokogiri::CSS.parse(html_page_as_string) parsed_styles.each do |style| existing_inlined_style = a_web_page.css(style.declaration) || '' a_web_page.css(style.declaration)['css'] = existing_inlined_style + style.definition end Which would extract styles from a stylesheet and add them all as inlined styles to my document.

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• In-line CSS IE hack

  - by Daimonan

  Is it possible to create, for instance, a box model hack while using in-line CSS? For example: <div id="blah" style="padding: 5px; margin: 5px; width: 30px; /*IE5-6 Equivalent here*/"> Thanks!

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• where did the _syscallN macros go in <linux/unistd.h>?

  - by Evan Teran

  It used to be the case that if you needed to make a system call directly in linux without the use of an existing library, you could just include <linux/unistd.h> and it would define a macro similar to this: #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \ type name(type1 arg1,type2 arg2,type3 arg3) \ { \ long __res; \ __asm__ volatile ("int $0x80" \ : "=a" (__res) \ : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \ "d" ((long)(arg3))); \ if (__res>=0) \ return (type) __res; \ errno=-__res; \ return -1; \ } Then you could just put somewhere in your code: _syscall3(ssize_t, write, int, fd, const void *, buf, size_t, count); which would define a write function for you that properly performed the system call. It seems that this system has been superseded by something (i am guessing that "[vsyscall]" page that every process gets) more robust. So what is the proper way (please be specific) for a program to perform a system call directly on newer linux kernels? I realize that I should be using libc and let it do the work for me. But let's assume that I have a decent reason for wanting to know how to do this :-).

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