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Mirror of https://github.com/RPCS3/llvm-mirror
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This patch introduces a new base class for Instruction named InstructionBase. Class InstructionBase is responsible for tracking data dependencies with the help of ReadState and WriteState objects. Class Instruction now derives from InstructionBase, and adds extra information related to the `InstrStage` as well as the `RCUTokenID`. ReadState and WriteState objects are no longer unique pointers. This avoids extra heap allocation and pointer checks that weren't really needed. Now, those objects are simply stored into SmallVectors. We use a SmallVector instead of a std::vector because we expect most instructions to only have a very small number of reads and writes. By using a simple SmallVector we also avoid extra heap allocations most of the time. In a debug build, this improves the performance of llvm-mca by roughly 10% (I still have to verify the impact in performance on a release build). llvm-svn: 345280 |
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| RELEASE_TESTERS.TXT | ||
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