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On PowerPC, a bitcast of <16 x i8> to i128 may run through a code path in ExpandRes_BITCAST that attempts to do an intermediate bitcast to a <4 x i32> vector, and then construct the Hi and Lo parts of the resulting i128 by pairing up two of those i32 vector elements each. The code already recognizes that on a big-endian system, the first two vector elements form the Hi part, and the final two vector elements form the Lo part (vice-versa from the little-endian situation). However, we also need to take endianness into account when forming each of those separate pairs: on a big-endian system, vector element 0 is the *high* part of the pair making up the Hi part of the result, and vector element 1 is the low part of the pair. The code currently always uses vector element 0 as the low part and vector element 1 as the high part, as is appropriate for little-endian platforms only. This patch fixes this by swapping the vector elements as they are paired up as appropriate. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165802 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| README.txt | ||
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.