llvm-project

7d867c6d - [LoopVersioningLICM] Only mark pointers with generated checks as noalias (#135168)

[LoopVersioningLICM] Only mark pointers with generated checks as noalias (#135168) Currently when we version a loop all loads and stores have the noalias metadata added to them. If there were some pointers that could not be analysed, and thus we could not generate runtime aliasing checks for, then we should not mark loads and stores using these pointers as noalias. This is done by getting rid of setNoAliasToLoop and instead using annotateLoopWithNoAlias, as that already correctly handles partial alias information. This does result in slightly different aliasing metadata being generated, but it looks like it's more precise. Currently this doesn't result in any change to the transforms that LoopVersioningLICM does, as LoopAccessAnalysis discards all results if it couldn't analyse every pointer leading to no loop versioning happening, but an upcoming patch will change that and we need this first otherwise we incorrectly mark some pointers as noalias even when they aren't.