[PATCH] D159283: Add intrinsic to count trailing zero elements in a vector

[Kerry McLaughlin via Phabricator via llvm-commits]

kmclaughlin added inline comments.


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Comment at: llvm/include/llvm/IR/Intrinsics.td:2176
+  DefaultAttrsIntrinsic<[llvm_anyint_ty],
+            [llvm_anyvector_ty, llvm_i32_ty],
+            [IntrNoMem, IntrNoSync, IntrWillReturn, ImmArg<ArgIndex<1>>]>;
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craig.topper wrote:
> why i32 instead of i1 like the existing cttz intrinsic?
Hi @craig.topper, I tried adding this argument as an i1, but ran into problems when trying to build the patterns in AArch64SVEInstrInfo.td if I tried to match this type. I tried to find some similar intrinsics but didn't find any with patterns that match an i1, which is why I chose to use an i32 with `timm32_0_1`.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D159283/new/

https://reviews.llvm.org/D159283