Build an ElementCount from loop vectorize width metadata, if present.
Synopsis
Declared in <llvm/Transforms/Utils/LoopUtils.h>
std::optional<ElementCount>
getOptionalElementCountLoopAttribute(Loop const* TheLoop);Description
Find a combination of metadata ("llvm.loop.vectorize.width" and "llvm.loop.vectorize.scalable.enable") for a loop and use it to construct a ElementCount. If scalable.enable is present the count is scalable; if scalable.disable is present or the tag is absent, it is fixed‐width. If the metadata "llvm.loop.vectorize.width" cannot be found then std::nullopt is returned.
Return Value
The ElementCount from vectorize metadata, or std::nullopt if absent.
Parameters
Name |
Description |
TheLoop |
Loop whose vectorize metadata is inspected. |
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