================
@@ -937,6 +940,26 @@ bool AArch64DAGToDAGISel::SelectRDVLImm(SDValue N, SDValue
&Imm) {
return false;
}
+// Given cntsd = (rdsvl, #1) >> 3, attempt to return a suitable multiplier
+// for RDSVL to calculate the streaming vector length in bytes * N. i.e.
+// rdsvl, #(ShlImm - 3)
----------------
MacDue wrote:
`N` is a the left-shift amount (so a multiply by 2**N), so I think this is
better phrased as:
```suggestion
// for RDSVL to calculate `cntsd << N`, i. `rdsvl, #(N - 3)`.
```
https://github.com/llvm/llvm-project/pull/154761
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