9466be2c87
A function that saves a callee-saved EGPR (R16-R31) cannot be encoded with V1/V2 unwind info, so it must use V3 even when the module default stays on V1/V2 (e.g. an APX clone created by auto-dispatch alongside a baseline generic clone). The previous code rejected such functions with a recoverable backend diagnostic ("EGPR (R16-R31) requires V3 unwind info on Windows x64") instead of emitting valid V3 unwind info.
Introduce a single shared predicate, requiresWinX64UnwindV3(MF), that returns true when the whole module is in V3 mode, or when the function needs an unwind table and may use EGPR. It is consumed by X86FrameLowering (SEH prolog/epilog layout), the X86WinEHUnwindV2 pass (which skips such functions), and the X86WinEHUnwindV3 pass (which stamps a per-function .seh_unwindversion 3 on every WinEH frame -- the entry block and each funclet). Also widen the SEH_UnwindVersion pseudo operand from i1imm to i8imm since it holds 1, 2 or 3.
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| flang | ||
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| libc | ||
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| lld | ||
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| llvm | ||
| llvm-libgcc | ||
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| offload | ||
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| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| LICENSE.TXT | ||
| pyproject.toml | ||
| README.md | ||
| SECURITY.md | ||
The LLVM Compiler Infrastructure
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.
Getting the Source Code and Building LLVM
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.
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