[GISel] Introduce MachineIRBuilder::(build|materialize)ObjectPtrOffset (#150392) These functions are for building G_PTR_ADDs when we know that the base pointer and the result are both valid pointers into (or just after) the same object. They are similar to SelectionDAG::getObjectPtrOffset. This PR also changes call sites of the generic (build|materialize)PtrAdd functions that implement pointer arithmetic to split large memory accesses to the new functions. Since memory accesses have to fit into an object in memory, pointer arithmetic to an offset into a large memory access also yields an address in that object. Currently, these (build|materialize)ObjectPtrOffset functions only add "nuw" to the generated G_PTR_ADD, but I intend to introduce an "inbounds" MIFlag in a later PR (analogous to a concurrent effort in SDAG: #131862, related: #140017, #141725) that will also be set in the (build|materialize)ObjectPtrOffset functions. Most test changes just add "nuw" to G_PTR_ADDs. Exceptions are AMDGPU's call-outgoing-stack-args.ll, flat-scratch.ll, and freeze.ll tests, where offsets are now folded into scratch instructions, and cases where the behavior of the check regeneration script changed, resulting, e.g., in better checks for "nusw G_PTR_ADD" instructions, matched empty lines, and the use of "CHECK-NEXT" in MIPS tests. For SWDEV-516125.
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.