[llvm] [RISCV] Use vcompress in deinterleave2 intrinsic lowering (PR #118325)

[Luke Lau via llvm-commits]

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@@ -10771,19 +10767,28 @@ SDValue RISCVTargetLowering::lowerVECTOR_DEINTERLEAVE(SDValue Op,
   }
 
   // For the indices, use the same SEW to avoid an extra vsetvli
+  // TODO: If container type is larger than m1, we can consider using a splat
+  // of a constant instead of the following sequence
+
+  // Create a vector of even indices {0, 1, 2, ...}
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lukel97 wrote:

Is this comment still needed? Since we don't have indices anymore, just a mask

https://github.com/llvm/llvm-project/pull/118325