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The register allocator can split a live interval of a register into a set of smaller intervals. After the allocation of registers is complete, the rewriter will modify the IR to replace virtual registers with the corres- ponding physical registers. At this stage, if a register corresponding to a subregister of a virtual register is used, the rewriter will check if that subregister is undefined, and if so, it will add the <undef> flag to the machine operand. The function verifying liveness of the subregis- ter would assume that it is undefined, unless any of the subranges of the live interval proves otherwise. The problem is that the live intervals created during splitting do not have any subranges, even if the original parent interval did. This could result in the <undef> flag placed on a register that is actually defined. Differential Revision: http://reviews.llvm.org/D21189 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279625 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| tools | ||
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| CODE_OWNERS.TXT | ||
| configure | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| llvm.spec.in | ||
| LLVMBuild.txt | ||
| README.txt | ||
| RELEASE_TESTERS.TXT | ||
Low Level Virtual Machine (LLVM) ================================ 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.