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b3213c121e
Summary: LLVM Allows Targets to provide information that guides optimisations made to LLVM IR. This is done with callbacks on a TargetTransformInfo object. This patch adds a TargetTransformInfo class for RISC-V. This will allow us to implement RISC-V specific callbacks as they become necessary. This commit also adds the getIntImmCost callbacks, and tests them with a simple constant hoisting test. Our immediate costs are on the conservative side, for the moment, but we prevent hoisting in most circumstances anyway. Previous review was on D63007 Reviewers: asb, luismarques Reviewed By: asb Subscribers: ributzka, MaskRay, llvm-commits, Jim, benna, psnobl, jocewei, PkmX, rkruppe, the_o, brucehoult, MartinMosbeck, rogfer01, edward-jones, zzheng, jrtc27, shiva0217, kito-cheng, niosHD, sabuasal, apazos, simoncook, johnrusso, rbar, hiraditya, mgorny Tags: #llvm Differential Revision: https://reviews.llvm.org/D63433 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364046 91177308-0d34-0410-b5e6-96231b3b80d8