[flang] Skip opt-bufferization when memory effect does not have an associated value (#140781) Memory effects on the volatile memory resource may not be attached to a particular source, in which case the value of an effect will be null. This caused this test case to crash in the optimized bufferization pass's safety analysis because it assumes it can get the SSA value modified by the memory effect. This is because memory effects on the volatile resource indicate that the operation must not be reordered with respect to other volatile operations, but there is not a material ssa value that can be pointed to. This patch changes the safety checks such that memory effects which do not have associated values are not safe for optimized bufferization.
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.