[llvm-branch-commits] [RISCV][CodeGen] Combine vwaddu+vabd(u) to vwabdacc(u) (PR #180162)

[Craig Topper via llvm-branch-commits]

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@@ -44,10 +43,23 @@ multiclass PseudoVABS {
   }
 }
 
+multiclass VPseudoVWABD_VV {
+  foreach m = MxListW in {
+    defvar mx = m.MX;
+    defm "" : VPseudoTernaryW_VV<m, Commutable = 1>,
+              SchedTernary<"WriteVIWMulAddV", "ReadVIWMulAddV",
+                           "ReadVIWMulAddV", "ReadVIWMulAddV", mx>;
+  }
+}
+
 let Predicates = [HasStdExtZvabd] in {
   defm PseudoVABS : PseudoVABS;
   defm PseudoVABD : VPseudoVALU_VV<Commutable = 1>;
   defm PseudoVABDU : VPseudoVALU_VV<Commutable = 1>;
+  let IsRVVWideningReduction = 1 in {
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topperc wrote:

there's no horizontal reduction in vwabdacc is there? Doesn't it write multiple elements in the destination?

https://github.com/llvm/llvm-project/pull/180162