forked from OSchip/llvm-project
ef4282e0ee
Previously for any copy from a register bigger than the destination: Copied to a same-sized register in the destination register bank. Subregister copy of that to the destination. This fails for copies from 128-bit FPRs to GPRs because the GPR register bank can't accomodate 128-bit values. Instead of special-casing such copies to perform the truncation beforehand in the source register bank, generalize this: a) Perform a subregister copy straight from source register whenever possible. This results in shorter MIR and fixes the above problem. b) Perform a full copy to target bank and then do a subregister copy only if source bank can't support target's size. E.g. GPR to 8-bit FPR copy. Patch by Raul Tambre (tambre)! Differential Revision: https://reviews.llvm.org/D75421 |
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README.txt
The LLVM Compiler Infrastructure ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.