[PATCH] D121915: [RISCV] CLZ Instruction

[Craig Topper via Phabricator via cfe-commits]

craig.topper added a comment.

Rethinking that. Since __builtin_clz is undefined for 0, I think we should have clang builtins, but we should use llvm.ctlz with false for the second argument as their implementation. See X86::BI__builtin_ia32_lzcnt_u32 for example.


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  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D121915/new/

https://reviews.llvm.org/D121915