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use tbaa.struct to inform LLVM about struct/enum padding #6736. Closed. thestinger opened this Issue May 25, #10613 is an example of how this bites us.tbaa.struct ' Metadata; ' noalias ' and ' alias.scope ' Metadata; ' fpmath ' Metadata file when compiling from source through the clang front end, for example. In LLVM IR, memory does not have types, so LLVM's own type system is not // suitable for We now support two types of metadata format: scalar TBAA and struct-path // aware TBAA. an example type tree" } // !1 = metadata !{ metadata !"int" 23 May 2017 I don't suggest it for production use, but you can do something like this: clang -cc1 -O1 -no-struct-path-tbaa -disable-llvm-optzns foo.cpp -emit-llvm -o -. to take a 16 Mar 2018 The LLVM compiler infrastructure supports a wide range of projects, from Consequently, type-based alias analysis, aka TBAA, aka To keep compilation simple I coded the compiler so that at the beginning of each I won't show the Clang generated tbaa metadata here, but here is how I Pointer. Size. TBAA tag. Sizes are given in address units (bytes usually) AA Implementations. BasicAA. SCEV-AA? TBAA. Globals ModRef etc. 23 // The scalar TBAA metadata format is very simple. TBAA MDNodes have up to. 24 // three fields, e.g.: 25 // !0 = !{ !"an example type tree" }. 26 // !1 = !{ !"int", !0 }. 25 Jan 2015 Max had a crack at writing a custom alias analysis pass for LLVM, Cmm in full we would need to track and propagate TBAA information. alias analysis. • Alias analysis in LLVM . Code example. 1: p = &x ; . Other LLVM alias analyses. • tbaa. • cfl-steens-aa. • scev-aa. • cfl-anders-aa. • + others