[X86] Fix assertion in AVX512 setcc combine due to invalid APInt mask width (#155775) The AVX512 setcc combine in X86ISelLowering was calling `APInt::getLowBitsSet` with a mask width (`Len`) that could exceed the bit width of the broadcasted scalar operand (`BroadcastOpVT.getSizeInBits()`), leading to assertion failures. This patch replaces `Len` with the number of defined (non-undef) elements in the constant pool vector. This ensures the generated mask is valid and avoids crashes when the constant pool contains more elements than the scalar bit width can represent. Fixes #155762
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.