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a0792de66c
allow target to correctly compute latency for cases where static scheduling itineraries isn't sufficient. e.g. variable_ops instructions such as ARM::ldm. This also allows target without scheduling itineraries to compute operand latencies. e.g. X86 can return (approximated) latencies for high latency instructions such as division. - Compute operand latencies for those defined by load multiple instructions, e.g. ldm and those used by store multiple instructions, e.g. stm. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115755 91177308-0d34-0410-b5e6-96231b3b80d8
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