jit

I want to know this info to reduce my code size so I will not waste my time optimize things that will be done by compiler or JIT. for example: if we assume the compiler inline the call to the get function of a property so I do not have to save the return value in a local variable to avoid function call. I want to recommend a good reference that describes what is going on? You may want to take a look at these articles: JIT Optimizations - (Sasha Goldshtein - CodeProject) Jit Optimizations: Inlining I (David Notario) Jit Optimizations: Inlining II (David Notario) To be honest you shouldn't be

In a comment on this answer (which suggests using bit-shift operators over integer multiplication / division, for performance), I queried whether this would actually be faster. In the back of my mind is an idea that at some level, something will be clever enough to work out that >> 1 and / 2 are the same operation. However, I'm now wondering if this is in fact true, and if it is, at what level it occurs. A test program produces the following comparative CIL (with optimize on) for two methods that respectively divide and shift their argument: IL_0000: ldarg.0 IL_0001: ldc.i4.2 IL_0002: div IL

I have no experience with llvm or clang, yet. From what I read clang is said to be easily embeddable Wikipedia-Clang , however, I did not find any tutorials about how to achieve this. So is it possible to provide the user of a c++ application with scripting-powers by JIT compiling and executing user-defined code at runtime? Would it be possible to call the applications own classes and methods and share objects? edit: I'd prefer a C-like syntax for the script-languge (or even C++ itself) I don't know of any tutorial, but there is an example C interpreter in the Clang source that might be

Using java -XX:+PrintFlagsFinal I found the TieredCompilation flag, and I read about it a bit online. Yet, I still don't know exactly what happens when setting it to false . I know that the compilation system supports 5 execution levels, basically splitted into interpreter, C1 and C2: level 0 - interpreter level 1 - C1 with full optimization (no profiling) level 2 - C1 with invocation and backedge counters level 3 - C1 with full profiling (level 2 + MDO) level 4 - C2 Source: http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/file/2b2511bd3cc8/src/share/vm/runtime/advancedThresholdPolicy.hpp#l34

What is the difference between the JIT compiler and CLR? If you compile your code to il and CLR runs that code then what is the JIT doing? How has JIT compilation changed with the addition of generics to the CLR? The JIT is one aspect of the CLR. Specifically it is the part responsible for changing CIL/MSIL (hereafter called IL) produced by the original language's compiler (csc.exe for Microsoft c# for example) into machine code native to the current processor (and architecture that it exposes in the current process, for example 32/64bit). If the assembly in question was ngen'd then the the

I was benchmarking some code, and I could not get it to run as fast as with java.math.BigInteger , even when using the exact same algorithm. So I copied java.math.BigInteger source into my own package and tried this: //import java.math.BigInteger; public class MultiplyTest { public static void main(String[] args) { Random r = new Random(1); long tm = 0, count = 0,result=0; for (int i = 0; i < 400000; i++) { int s1 = 400, s2 = 400; BigInteger a = new BigInteger(s1 * 8, r), b = new BigInteger(s2 * 8, r); long tm1 = System.nanoTime(); BigInteger c = a.multiply(b); if (i > 100000) { tm += System

I would like to know how to check if the JIT compiler is turned off. I have the following code which is meant to turn the JIT compiler off.The problem is, I am not sure if it is actually doing that. So I was wondering if there is a way of checking if the JIT is off. I looked at the Compiler class but there isn't any method like isDisabled/enabled() . Code: Compiler.disable(); Any help or direction will be highly appreciated. I don't believe you can turn the JIT off at runtime. If you want to seriously benchmark a Java program, you should definitely be ignoring the first few runs. Getting

I created this class for being immutable and having a fluent API: public final class Message { public final String email; public final String escalationEmail; public final String assignee; public final String conversationId; public final String subject; public final String userId; public Message(String email, String escalationEmail, String assignee, String conversationId, String subject, String userId) { this.email = email; this.escalationEmail = escalationEmail; this.assignee = assignee; this.conversationId = conversationId; this.subject = subject; this.userId = userId; } public Message() {