f486cc4417
Flang currently adds loop metadata to a conditional branch in the loop preheader, while clang adds it to the loop latch's branch instruction. Langref says: > Currently, loop metadata is implemented as metadata attached to the branch instruction in the loop latch block. > > https://llvm.org/docs/LangRef.html#llvm-loop I misread langref a couple times, but I think this is the appropriate branch op for the LoopAnnotationAttr. In a couple examples I found that the metadata was lost entirely during canonicalization. This patch makes the codegen look more like clang's and the annotations persist through codegen. * current clang: https://godbolt.org/z/8WhbcrnG3 * current flang: https://godbolt.org/z/TrPboqqcn
Flang Integration Tests
This directory can be used to add Integration tests involving multiple stages of the compiler (for eg. from Fortran to LLVM IR). It should not contain executable tests. We should only add tests here sparingly and only if there is no other way to test. Repeat this message in each test that is added to this directory and sub-directories.