[llvm] [LangRef] Clarify `align` and `nonnull` interaction with `noundef` in parameter attributes section (PR #224236)

[Yingwei Zheng via llvm-commits]

=?utf-8?q?Ömer_Sinan_Ağacan?= <omer at osa1.net>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/224236 at github.com>


dtcxzyw wrote:

> Does not say what exactly is undefined when you don't have noundef.

Isn't the sentence above clear enough?

> If the pointer value does not have
    the specified alignment, {ref}`poison value <poisonvalues>` is returned or
    passed instead.

We first check poison-generating attributes, then check UB-implying attributes (noundef/dereferenceable[_or_null]).


https://github.com/llvm/llvm-project/pull/224236