[llvm] [RISCV][GISEL] Legalize G_EXTRACT_SUBVECTOR (PR #109426)

[Craig Topper via llvm-commits]

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@@ -57,3 +57,13 @@ def G_SPLAT_VECTOR_SPLIT_I64_VL : RISCVGenericInstruction {
   let InOperandList = (ins type0:$passthru, type1:$hi, type1:$lo, type2:$vl);
   let hasSideEffects = false;
 }
+
+// Pseudo equivalent to a RISCVISD::VSLIDEDOWN_VL
+def G_VSLIDEDOWN_VL : RISCVGenericInstruction {
+  let OutOperandList = (outs type0:$dst);
+  let InOperandList = (ins type0:$merge, type0:$vec, type1:$idx, type2:$mask,
+                       type3:$vl, type4:$policy);
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topperc wrote:

type3 and type4 should just be type1 I think.

https://github.com/llvm/llvm-project/pull/109426