diff options
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp b/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp index 4890d45a6d3..53472857b9a 100644 --- a/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp +++ b/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp @@ -384,6 +384,15 @@ RegBankSelect::MappingCost RegBankSelect::computeMapping( // Thus, if we end up here this information should be here. assert(MBFI && MBPI && "Cost computation requires MBFI and MBPI"); + // FIXME: We will have to rework the repairing cost model. + // The repairing cost depends on the register bank that MO has. + // However, when we break down the value into different values, + // MO may not have a register bank while still needing repairing. + // For the fast mode, we don't compute the cost so that is fine, + // but still for the repairing code, we will have to make a choice. + // For the greedy mode, we should choose greedily what is the best + // choice based on the next use of MO. + // Sums up the repairing cost of MO at each insertion point. uint64_t RepairCost = getRepairCost(MO, ValMapping); // Bias used for splitting: 5%. |
