jit

问题 I want to use pyculib.fft in a pycharm project, to be precise inside a numba.njit decorated function. Someone on Stackoverflow suggested to me to use it, since I need to find a way to use an fft function inside a numba.njit decorated function. But I can't get pyculib to work. I have tried using a Python 3.7 interpreter as well as an Anaconda interpreter. In both cases pyculib 1.0.1 is installed, which is the only version available in pycharm. With Python interpreter: import pyculib Output: C:

问题 I am trying to call a function - that should have an absolute address when compiled and linked - from machine code. I am creating a function pointer to the desired function and trying to pass that to the call instruction, but I noticed that the call instruction takes at most a 16 or 32-bit address. Is there a way to call an absolute 64-bit address? I am deploying for the x86-64 architecture and using NASM to generate the machine code. I could work with a 32-bit address if I could be

问题 I have been reading a lot about synchronization in Java and all the problems that can occur. However, what I'm still slightly confused about is how the JIT can reorder a write. For instance, a simple double check lock makes sense to me: class Foo { private volatile Helper helper = null; // 1 public Helper getHelper() { // 2 if (helper == null) { // 3 synchronized(this) { // 4 if (helper == null) // 5 helper = new Helper(); // 6 } } return helper; } } We use volatile on line 1 to enforce a

问题 For example : Code 1: void Main() { Console.WriteLine("Some texts"); } Code 2: void Main() { Foo(); } void Foo() { Console.WriteLine("Some texts"); } Does code 2 run slower than code 1 ? I though when we build the release the JIT will inline code 2 so then code 2 will run as fast as code 1. But when I test them with LinqPad I got the IL result : Code 1: IL_0000: ldstr "Some texts" IL_0005: call System.Console.WriteLine Code 2: IL_0000: ldarg.0 IL_0001: call UserQuery.Foo Foo: IL_0000: ldstr

问题 For example : Code 1: void Main() { Console.WriteLine("Some texts"); } Code 2: void Main() { Foo(); } void Foo() { Console.WriteLine("Some texts"); } Does code 2 run slower than code 1 ? I though when we build the release the JIT will inline code 2 so then code 2 will run as fast as code 1. But when I test them with LinqPad I got the IL result : Code 1: IL_0000: ldstr "Some texts" IL_0005: call System.Console.WriteLine Code 2: IL_0000: ldarg.0 IL_0001: call UserQuery.Foo Foo: IL_0000: ldstr

问题 For example : Code 1: void Main() { Console.WriteLine("Some texts"); } Code 2: void Main() { Foo(); } void Foo() { Console.WriteLine("Some texts"); } Does code 2 run slower than code 1 ? I though when we build the release the JIT will inline code 2 so then code 2 will run as fast as code 1. But when I test them with LinqPad I got the IL result : Code 1: IL_0000: ldstr "Some texts" IL_0005: call System.Console.WriteLine Code 2: IL_0000: ldarg.0 IL_0001: call UserQuery.Foo Foo: IL_0000: ldstr

问题 I was wondering if there is a method maximum size for JIT C2 to compile it. Let's assume there is a method which just maps one class to another, but this class contains a lot of fields. It became hot, C1 optimizes it but at some point C2 will kick in. If byte code is long enough, will C2 ignore that method and do not compile it? I couldn't find any answer for my question. Maybe there is not such a thing? 回答1: There are a number of JIT compiler limits. One of them is HugeMethodLimit equal to

问题 The major JavaScript engines of web browsers and nodeJS have had just-in-time compilers for years. I was just watching a video on Compiler Explorer showing the assembly code output by many compilers for various CPUs. This reminded me that I've been curious about the code generated by the JS engines' jits. Do any of those engines have ways for us to see that low-level generated code? (If this is out of place on SO please feel free to migrate it to the correct SE site.) 回答1: For V8, there is a

问题 I have a small read-only database (based on data from services). The load time is critical so data can't be extracted from DB, XML and so on. I use the direct construction of data in the generated C# file: void Load(){ var aa = new A[ 100500 ]; aa[0] = new A( ... ); ... aa[100499] = new A( ... ); AA = aa; } There are no recursion here, stackallocks and so on. But I have got a StackOverflow error. Looking in Disassembler window I found that JIT converts this code into: var aa = new A[ 100500 ]

问题 Our web site has a fairly complex JS app that fails with the latest Firefox 10 release. This is due to what appears to be a bug in the JS interpretor, making variables return NULL when they clearly aren't. This bug only occurs when the JIT compiler is active, not when it's disabled. We will report the bug to Mozilla and try to find a workaround. Is there a way to disable the JIT in Firefox for a specific script, from inside the script? Thank you. 回答1: The answer comes from Brian Hackett (