Contents Compiler Explorer for the EPAC - User Guide
This is a setup of a Compiler Explorer for an LLVM-based compiler that targets the RISC-V and the V-extension (still draft) architecture. This tool is intended
Exploring Compiler Explorer
14 oct. 2020 14 October 2020. Paterno
Godbolt Compiler Explorer
What is Compiler Explorer? ? Created by Matt Godbolt. ? Former developer at Google. ? Worked in the video game industry. ? Likes talking at CppCon.
The CakeML Compiler Explorer
The CakeML Compiler Explorer. Visualizing how a verified compiler transforms expressions. Bachelor of Science thesis in Software Engineering. Rikard Hjort.
Optimizations in C++ compilers
1 févr. 2020 Compiler Explorer.1. Over the years I have been constantly amazed by the lengths to which com- pilers go in order to take our code and.
Compiler Explorer C to ASM https://godbolt.org/
Page 1. Compiler Explorer C to ASM https://godbolt.org/
Concepts Error Messages for Humans
16 mai 2022 /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/concepts: In substitution of 'template<class N> requires integral<N> void f(N) [with N ...
décembre
Le site Compiler Explorer a ajouté une bannière à sa liste invitant les gens à participer à. CPPP pendant les mois précédent l'événement.
SIMD - The Good the Bad and the Ugly
compilers try to transform serial code into SIMD code. • this does not work for complicated code https://github.com/compiler-explorer/compiler-explorer.
4. C++ advanced (I)
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/bits/stl_algo.h:4842:18: required from 'void std::sort(_RAIter _RAIter).
Exploring Compiler Explorer
Marc Paterno
14 October 2020
Section 1
Demo2/8 14 October 2020 Paterno|Exploring Compiler Explorer
Isintfaster as a loop index thansize_type?
A C-style array is accessed by an index of typeint. A C++std::vectororstd::arrayis accessed by an index of typesize_type(often unsigned long). Some people prefer to useintto accessstd::vectorvalues, because the smaller type is faster".Is this true?
g++ 10.2: https://godbolt.org/z/dbEcWj. clang++ 10.0.1: https://godbolt.org/z/P9r93b.3/8 14 October 2020 Paterno|Exploring Compiler Explorer
How does g++ compare to clang for this code?
We can compare the output of two (or more) compilers on the same code. For this, we"ll see the graph output can be useful. clang++ and g++ comparison: https://godbolt.org/z/bnz7vo.4/8 14 October 2020 Paterno|Exploring Compiler Explorer
How do the range algorithms perform?
We can use a selection of 3rd party libraries
https://godbolt.org/z/98e7sG. To see the difference betwen the generated code, use the top-level Add" button and add a diff view". Compiler Explorer has Intel C++ also. On code like this, it can vectorize the sum. Let"s compare g++, clang++, and icc: https://godbolt.org/z/4oKbfj.5/8 14 October 2020 Paterno|Exploring Compiler Explorer
Use llvm-mca to understand a bit more
We can select the loop from the assembly code, and paste the results into the llvm-mcatool formachine code analysis.Start from https://godbolt.org/z/ohKbb9.
Copy code; switch editor to new language"analysis, and paste in code Set the compiler flags"-timeline -mcpu=skylake(or whatever hardware you like)Result is https://godbolt.org/z/sf44vK.
6/8 14 October 2020 Paterno|Exploring Compiler Explorer
Compiler conformance view
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