[ValueTracking] Refine SIToFP/UIToFP FPClass inference with KnownBits (#187185) This patch propagates the KnownBits of the source integer to improve floating-point class inference for sitofp and uitofp instructions. Specifically, 1. The result is never -0.0. 2. The result is not +0.0 if the source integer is known non-zero. 3. The result is not negative if the source integer is known non-negative (or for uitofp). 4. The result is not Infinity if the largest possible integer magnitude fits within the target FP type's exponent limits. alive2 results for added testcases: testcase 1: https://alive2.llvm.org/ce/z/eM34LB testcase 2: https://alive2.llvm.org/ce/z/ext7XF testcase 3: https://alive2.llvm.org/ce/z/g8yb6q testcase 4: https://alive2.llvm.org/ce/z/cyFYRy testcase 5: https://alive2.llvm.org/ce/z/LePFrm alive2 for updated testcase in binop-itofp: updated 1: https://alive2.llvm.org/ce/z/KPQ5bZ udpated 2: https://alive2.llvm.org/ce/z/bGf43t updated 3: https://alive2.llvm.org/ce/z/YKnCwU updaetd 4: https://alive2.llvm.org/ce/z/mqKaq- updated 5: https://alive2.llvm.org/ce/z/jYSAB5 Fix #186952
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.