[llvm] [AArch64] Check for exact size when finding 1's for CMLE. (PR #76452)

[Antonio Frighetto via llvm-commits]

https://github.com/antoniofrighetto approved this pull request.

Thank you for the patch, restricting the check to determine whether the splat matches the exact input size looks definitely more appropriate.

https://github.com/llvm/llvm-project/pull/76452