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5cd79bc14c
optimizers could do this for us, but expecting partial SROA of classes with template methods through cloning is probably expecting too much heroics. With this change, the begin/end pointer pairs which indicate the status of each loop iteration are actually passed directly into each layer of the combine_data calls, and the inliner has a chance to see when most of the combine_data function could be deleted by inlining. Similarly for 'length'. We have to be careful to limit the places where in/out reference parameters are used as those will also defeat the inliner / optimizers from properly propagating constants. With this change, LLVM is able to fully inline and unroll the hash computation of small sets of values, such as two or three pointers. These now decompose into essentially straight-line code with no loops or function calls. There is still one code quality problem to be solved with the hashing -- LLVM is failing to nuke the alloca. It removes all loads from the alloca, leaving only lifetime intrinsics and dead(!!) stores to the alloca. =/ Very unfortunate. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154264 91177308-0d34-0410-b5e6-96231b3b80d8 |
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Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, 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 HTML documentation provided in docs/index.html for further assistance with LLVM. If you're writing a package for LLVM, see docs/Packaging.html for our suggestions.