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FindAvailableLoadedValue() accepts an iterator by reference. If no available value is found, then the iterator will either be left at a clobbering instruction or the beginning of the basic block. This allows using FindAvailableLoadedValue() across multiple blocks. If this functionality is not needed, as is the case in InstCombine, then we can use a much more efficient implementation: First try to find an available value, and only perform clobber checks if we actually found one. As this function only looks at a very small number of instructions (6 by default) and usually doesn't find an available value, this saves many expensive alias analysis queries. |
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| .. | ||
| CMakeLists.txt | ||
| InstCombineAddSub.cpp | ||
| InstCombineAndOrXor.cpp | ||
| InstCombineAtomicRMW.cpp | ||
| InstCombineCalls.cpp | ||
| InstCombineCasts.cpp | ||
| InstCombineCompares.cpp | ||
| InstCombineInternal.h | ||
| InstCombineLoadStoreAlloca.cpp | ||
| InstCombineMulDivRem.cpp | ||
| InstCombineNegator.cpp | ||
| InstCombinePHI.cpp | ||
| InstCombineSelect.cpp | ||
| InstCombineShifts.cpp | ||
| InstCombineSimplifyDemanded.cpp | ||
| InstCombineVectorOps.cpp | ||
| InstructionCombining.cpp | ||