Compiler unlikely

What is likely and unlikely in Linux?
The kernel has two macros to assist the compiler and CPU in doing branch prediction: likely() and unlikely().
As their names imply, they are meant to annotate tests in the code based on the likelihood that they will evaluate to true..
What is the unlikely keyword in C++?
The [[unlikely]] attribute specifies a hint to the compiler that the code path for the attributed label or statement is less likely to execute than alternatives.
In the Microsoft compiler, the [[unlikely]] attribute marks blocks as "cold code", which decrements an internal optimization score..
What is the use of unlikely in C?
Use of the unlikely macro allows the compiler to optimize by removing an instruction from the likely path.
From the above comparison, we see that the compiler has removed on instruction from the likely path — xor eax, eax ._{Aug 24, 2019}.
What is unlikely C++?
C++ attribute: likely, unlikely (since C++20)
Allow the compiler to optimize for the case where paths of execution including that statement are more or less likely than any alternative path of execution that does not include such a statement._{May 20, 2023}.
What is unlikely in Linux kernel?
One optimization that is utilized in the kernel are a couple of macros called likely() and unlikely().
These macros are hints to the compiler (namely gcc) such that it can know the probable path of a conditional statement._{Feb 17, 2017}.
C++ attribute: likely, unlikely (since C++20)
Allow the compiler to optimize for the case where paths of execution including that statement are more or less likely than any alternative path of execution that does not include such a statement._{May 20, 2023}
One optimization that is utilized in the kernel are a couple of macros called likely() and unlikely().
These macros are hints to the compiler (namely gcc) such that it can know the probable path of a conditional statement.
One optimization that is utilized in the kernel are a couple of macros called likely() and unlikely().
These macros are hints to the compiler (namely gcc) such that it can know the probable path of a conditional statement._{Feb 17, 2017}
The [[unlikely]] attribute specifies a hint to the compiler that the code path for the attributed label or statement is less likely to execute than alternatives.
In the Microsoft compiler, the [[unlikely]] attribute marks blocks as "cold code", which decrements an internal optimization score.

Sep 20, 2008They are hint to the compiler to emit instructions that will cause branch prediction to favour the "likely" side of a jump instruction.Using Likely() / Unlikely() Preprocessor Macros in if-else if chainCan likely/unlikely macros be used in user-space code?c++ - Simple example where [[likely]] and [[unlikely]] affect program Why doesn't likely and unlikely macros have any effect on ARM More results from stackoverflow.com

Sep 20, 2008They are hint to the compiler to emit instructions that will cause branch prediction to favour the "likely" side of a jump instruction.Using Likely() / Unlikely() Preprocessor Macros in if-else if chaingcc likely() unlikely() macros and assembly code - Stack Overflowc++ - Simple example where [[likely]] and [[unlikely]] affect program learning sample of likely() and unlikely() compiler hintsMore results from stackoverflow.com

Use of the unlikely macro allows the compiler to optimize by removing an instruction from the likely path. From the above comparison, we see that the compiler has removed on instruction from the likely path — xor eax, eax .

Compiler unlikely

What is likely and unlikely in Linux?

What is the unlikely keyword in C++?

What is the use of unlikely in C?

What is unlikely C++?

What is unlikely in Linux kernel?