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The Legalizer expands the operations of urem/srem into a div+mul+sub or divrem when those are legal/custom. This patch changes the cost-model to reflect that cost. Since there is no 'divrem' Instruction in LLVM IR, the cost of divrem is assumed to be the same as div+mul+sub since the three operations will need to be executed at runtime regardless. Patch co-authored by David Sherwood (@david-arm) Reviewed By: RKSimon, paulwalker-arm Differential Revision: https://reviews.llvm.org/D103799 |
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