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8e6b545e6e
In a few places in getInstrMapping, we check if use/def instructions for the instruction we're mapping have floating point constraints. We can improve this check and reduce the number of copies in GISel-compiled code if we make a couple observations: - For a def instruction, it only matters if the def instruction must always output a value stored on a FPR - For a use instruction, it only matters if the use instruction must always only take in values stored in FPRs This adds two new functions: - onlyUsesFP - onlyDefinesFP Then we can use those when we're checking the uses/defs instead. Without this patch, the load, unmerge, store, and select in the added test would have unnecessary copies. Differential Revision: https://reviews.llvm.org/D62426 llvm-svn: 361679 |
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