[llvm] [RISCV][GlobalISel] Legalize Scalable Vector Loads (PR #84965)

[Jiahan Xie via llvm-commits]

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@@ -220,7 +220,8 @@ struct TypePairAndMemDesc {
            Align >= Other.Align &&
            // FIXME: This perhaps should be stricter, but the current legality
            // rules are written only considering the size.
-           MemTy.getSizeInBits() == Other.MemTy.getSizeInBits();
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jiahanxie353 wrote:

It's true we can do BIT_CAST if `ScalableEltTy != FixedEltTy` && `MinNumElts * EltTy == FixedEltTy` (2 * 8 == 16 in your example).
I was wondering what if `ScalableEltTy == FixedEltTy` and `MinNumElts > 1`? In these cases, the scalable vector is the "superset" of the fixed one so they can be compatible in the sense of fitting one into another. Am I understanding it correctly?

https://github.com/llvm/llvm-project/pull/84965