Constants and compiler optimization in C++ - Stack Overflow
Jul 3, 2012 · All of the optimization opportunities mentioned in this answer appear to be possible only in case of compile-time constants. They seem useless in the case of const declared objects whose …
Is optimisation level -O3 dangerous in g++? - Stack Overflow
Jul 18, 2018 · I have heard from various sources (though mostly from a colleague of mine), that compiling with an optimisation level of -O3 in g++ is somehow 'dangerous', and should be avoided in …
How can I prevent GCC optimizing some statements in C?
Nov 24, 2023 · 126 Turning off optimization fixes the problem, but it is unnecessary. A safer alternative is to make it illegal for the compiler to optimize out the store by using the volatile type qualifier.
List of common C++ Optimization Techniques - Stack Overflow
Can I have a great list of common C++ optimization practices? What I mean by optimization is that you have to modify the source code to be able to run a program faster, not changing the compiler
c++ - GCC: Difference between -O3 and -Os - Stack Overflow
Apr 5, 2022 · The GCC documentation describes what these options do very explicitly. -O3 tries to optimize code very heavily for performance. It includes all of the optimizations -O2 includes, plus …
c++ - How do compilers optimize our code? - Stack Overflow
Compilers are free to optimize code so long as they can guarantee the semantics of the code are not changed. I would suggestion starting at the Compiler optimization wikipedia page as there are many …
Which gcc optimization flags should I use? - Stack Overflow
Optimization is compiler-specific. You appear to be using GCC-style compiler options, but other compilers accept similar flags. Tag this question with the C compiler you are using if you want …
What are copy elision and return value optimization?
Oct 18, 2012 · NRVO (Named Return Value Optimization): If a function returns a class type by value and the return statement's expression is the name of a non-volatile object with automatic storage duration …
What is the difference between the /Ox and /O2 compiler options?
Apr 2, 2015 · Microsoft's C++ compiler (cl.exe, as included with Visual Studio) offers several optimization switches. The difference between most of them seems self-explanatory, but it's not clear …
c++ - Meaning of gcc -O2 - Stack Overflow
Mar 17, 2009 · Optimization level 2. From the GCC man page: -O1 Optimize. Optimizing compilation takes somewhat more time, and a lot more memory for a large function. -O2 Optimize even more. …