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`llvm-mca` relies on the predicates to be based on `MCSchedPredicate` in order to resolve the scheduling for variant instructions. Otherwise, it aborts the building of the instruction model early. However, the scheduling model emitter in `TableGen` gives up too soon, unless all processors use only such predicates. In order to allow more processors to be used with `llvm-mca`, this patch emits scheduling transitions if any processor uses these predicates. The transition emitted for the processors using legacy predicates is the one specified with `NoSchedPred`, which is based on `MCSchedPredicate`. Preferably, `llvm-mca` should instead assume a reasonable default when a variant transition is not based on `MCSchedPredicate` for a given processor. This issue should be revisited in the future. Differential revision: https://reviews.llvm.org/D54648 llvm-svn: 347504
The LLVM Compiler Infrastructure
This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.