Cppreference and this documentation do not state explicitly that likelihood attributes won't work with a single if statement. Or, I just do not unders ...
Cppreference and this documentation do not state explicitly that likelihood attributes won't work with a single if statement. Or, I just do not unders ...
Code ran on Visual Studio 2019 Version 16.11.8 with /O2 Optimization and Intel CPU. I am trying to find the root cause for this counter-intuitive resu ...
IN SHORT: Is there a place to put the [[(un)likely]] attribute so that the control flow at cond2 is considered likely to take the false branch, withou ...
This is a naive general question open to any platform, language, or compiler. Though I am most curious about Aarch64, C++, GCC. When coding an unavoi ...
In my objdump -t output, I see the following two lines: and I know l means local and g means global. I also know that .text is a section, or a t ...
I took below example from https://kernelnewbies.org/FAQ/LikelyUnlikely and compiled it https://godbolt.org/z/IC0aif with arm gcc 8.2 compiler. In ...
I often find myself writing a code that looks something like this: Should I prefer handling errors with if unlikely? Will the compiler automatic ...
If I have: Can I put likely() around the last condition check like else if (likely(Z)) to signify that the final statement (else) is very unlikely ...
I have an understanding of how the likely()/unlikely() macros work and I also have an understanding of branch prediction. Unfortunately, I did not lea ...
I am writing a critical piece of code with roughly the following logic I am thinking to use likely() macro around the expression, so when it hits t ...
Just see this construction in the linux kernel, and I can't get what does it mean. I know that likely/unlikely are made with __builtin_expect funct ...
How can I demonstrate for students the usability of likely and unlikely compiler hints (__builtin_expect)? Can you write an sample code, which will b ...
I came across these 2 macros in Linux kernel code. I know they are instructions to compiler (gcc) for optimizations in case of branching. My question ...
GCC compiler supports __builtin_expect statement that is used to define likely and unlikely macros. eg. Is there an equivalent statement for the M ...
I've been digging through some parts of the Linux kernel, and found calls like this: or I've found the definition of them: I know that they a ...