[llvm] [TTI][RISCV] Implement cost of some intrinsics with LMUL (PR #117874)

[via llvm-commits]

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@@ -1013,20 +1013,78 @@ RISCVTTIImpl::getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
   case Intrinsic::sadd_sat:
   case Intrinsic::ssub_sat:
   case Intrinsic::uadd_sat:
-  case Intrinsic::usub_sat:
-  case Intrinsic::fabs:
+  case Intrinsic::usub_sat: {
+    auto LT = getTypeLegalizationCost(RetTy);
+    if (ST->hasVInstructions() && LT.second.isVector()) {
+      unsigned Op;
+      switch (ICA.getID()) {
+      case Intrinsic::sadd_sat:
+        Op = RISCV::VSADD_VV;
+        break;
+      case Intrinsic::ssub_sat:
+        Op = RISCV::VSSUBU_VV;
+        break;
+      case Intrinsic::uadd_sat:
+        Op = RISCV::VSADDU_VV;
+        break;
+      case Intrinsic::usub_sat:
+        Op = RISCV::VSSUBU_VV;
+        break;
+      }
+      return LT.first * getRISCVInstructionCost(Op, LT.second, CostKind);
+    }
+    break;
+  }
+  case Intrinsic::fabs: {
+    auto LT = getTypeLegalizationCost(RetTy);
+    // FIXME: not get the correct cost about the llvm.sqrt.vxbf16
+    // LT.second is promote llvm::MVT::f32
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LiqinWeng wrote:

removed

https://github.com/llvm/llvm-project/pull/117874