CODEWITHSUNDEEP
c#performancex86cilildasm
danatel
danatel

Reputation: 4982

disassemble c# code to machine instructions

I am experimenting with compiler performance. I have a very small piece of code, just a few floating point multiplications and additions. The code gets executed in a loop several million times. I am trying to compile the code in C++, c#, java, perl, python ... and then I run the result while measuring execution time.

I am quite dissatisfied with c# performance. My c# code is about 60% slower than equivalent C++ or java. I am sure, there must be a bug in my experiment. I would like to disassemble the resulting binary to learn why.

Is there such a option with MSIL code? Can the result of the c# JIT compiler be examined on the machine instruction level (x86 instructions, not MSIL instructions)?

Update

the code (u, v, g* are double; steps is integer)

stopwatch.Start();
for (int i = 0; i < steps; i++)
{
    double uu = g11 * u + g12 * v;
    v = g21 * u + g22 * v;
    u = uu;
}
stopwatch.Stop();

Upvotes: 5

Views: 865

Answers (3)

Guffa
Guffa

Reputation: 700152

Debug your code in Visual Studio (but compile in release mode), put a breakpoint in the loop, and open the Disassembly window (Debug -> Windows -> Disassembly) when the execution stops at the breakpoint.

Upvotes: 7

Andrew Savinykh
Andrew Savinykh

Reputation: 26270

Ngen your program and disassemble the results.

Upvotes: 4

M4N
M4N

Reputation: 96541

Maybe you could ngen (compile to native code) the binary first, to avoid the JIT compilation.

Upvotes: 1

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