[llvm] [NVPTX] Add Intrinsics for discard.* (PR #128404)

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gonzalobg wrote:

The pointer needs to be 128-byte aligned (so naturally-aligned). Thanks!
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From: Artem Belevich ***@***.***>
Sent: Friday, February 28, 2025 7:15:24 PM
To: llvm/llvm-project ***@***.***>
Cc: Gonzalo Brito ***@***.***>; Mention ***@***.***>
Subject: Re: [llvm/llvm-project] [NVPTX] Add Intrinsics for discard.* (PR #128404)


@Artem-B commented on this pull request.

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In llvm/docs/NVPTXUsage.rst<https://github.com/llvm/llvm-project/pull/128404#discussion_r1975840792>:

> +The operand ``immarg`` is an integer constant that specifies the length in bytes of the
+address range ``[%ptr, %ptr + immarg)`` to write ``undef`` into.


Are there any requirements on alignment of the pointer?

If the pointer is not required to be aligned on 128-byte boundary, does invalidation affect [ptr, ptr+imm] range only, or does it invalidate all cache lines overlapping specified range?

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https://github.com/llvm/llvm-project/pull/128404