[llvm-branch-commits] [llvm] [LV] Add ExtNegatedMulAccReduction expression type (PR #160154)

[Sam Tebbs via llvm-branch-commits]

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@@ -2861,12 +2861,17 @@ InstructionCost VPExpressionRecipe::computeCost(ElementCount VF,
     return Ctx.TTI.getMulAccReductionCost(false, Opcode, RedTy, SrcVecTy,
                                           Ctx.CostKind);
 
-  case ExpressionTypes::ExtMulAccReduction:
+  case ExpressionTypes::ExtNegatedMulAccReduction:
+  case ExpressionTypes::ExtMulAccReduction: {
+    if (ExpressionType == ExpressionTypes::ExtNegatedMulAccReduction &&
+        Opcode == Instruction::Add)
+      Opcode = Instruction::Sub;
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SamTebbs33 wrote:

Addressed now, thanks!

https://github.com/llvm/llvm-project/pull/160154