Debug vs. Release Builds: How Much Does Build Configuration Impact Performance?

Debug and Release version performance difference analysis

In the field of programming, choosing Debug or the Release version is usually just a habit. But what is the impact of Debug and Release versions on performance? This article will discuss this.

Performance differences

C#compiler itself does not introduce significant differences between the debug and the release version. However, the JIT compiler will optimize a series of optimizations in the Release version, which significantly improves performance:

Method Internal Federation:

Eliminate the method call by inserting the method code into the call position, which greatly reduces the overhead.

• CPU register allocation: Slocked local variables and parameters in the register to increase the speed.

Organization index check and elimination:
• When meeting specific conditions, you can remove the number of index inspections, thereby speeding up the speed of array. Cycle expansion:
Expand the cycle with smaller code blocks to eliminate the cost of branch and improve performance.
• Dead code elimination: Delete the unreachable code and simplify the execution process.
• Code improvement: Move the unchanged code outside the cycle to improve efficiency.
Public sub -expression elimination:
• Eliminate repeated calculations and save time. Constant folding:
Calculate the constant expression during compilation, thereby speeding up the execution speed.
• Copy and spread: Optimize the distribution of register by eliminating unnecessary assignment.
• Code reliability
• Although the JIT optimizer is usually reliable, occasionally problems may occur in the Release version. Previous examples include problems in structures in X64 and X86 Jitters, and floating point consistency problems in X86 Jitters.

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