[SCEV] Consider non-volatile memory intrinsics as not having side-effect for forward progress (#150916) For the attached test: Before the loop-idiom pass, we have a store into the inner loop which is considered simple and one that does not have any side effects on the loop. Post loop-idiom pass, we get a memset into the outer loop that is considered to introduce side effects on the loop. This changes the backedge taken count before and after the pass and hence, the crash with verify-scev. We try to consider non-volatile memory intrinsics as not having side-effect for forward progress to fix the issue. Fixes #149377
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.