[RISCV] Accept c.slli/c.srli/c.srli with a 0 immediate as hints. (#150689) These encodings were previously assigned to c.slli64/srli64/srai64, and designated as hints for RV32 and RV64. Those mnemonics no longer appear in the ISA manual after RV128 was removed. The spec now says that c.slli/c.srli/c.srai with an immediate of 0 is a hint. This patch updates the assembler to accept this. I've left the old spelling for backwards compatibility but we disassemble a shift with a zero immediate. The C_SLLI64_HINT/C_SRLI_HINT/C_SRAI_HINT instructions are removed and the predicates for C_SLLI/C_SRLI/C_SRAI not accept a 0 immediate. Fixes #150304
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.