[PATCH] D103147: [SelectionDAG][RISCV] Don't unroll 0/1-type bool VSELECTs

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck marked an inline comment as done.
frasercrmck added inline comments.


================
Comment at: llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp:1192
+  auto BoolContents = TLI.getBooleanContents(Op1.getValueType());
+  if (BoolContents == TargetLowering::UndefinedBooleanContent ||
+      (BoolContents == TargetLowering::ZeroOrOneBooleanContent &&
----------------
craig.topper wrote:
> I wonder if this would be better as
> 
> ```
> if (BoolContents != TargetLowering::ZeroOrNegativeOneBooleanContent &&
>      !(BoolContents == TargetLowering::ZeroOrOneBooleanContent && Op1.getValueType().getVectorElementType() != MVT::i1)
> ```
> 
> That way if some new boolean contents type gets added, only the values that are known to work get through.
Yep that's a good idea, thanks. Though the `!= MVT::i1` should be `==` unless I'm mistaken.


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  https://reviews.llvm.org/D103147/new/

https://reviews.llvm.org/D103147