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Merge 2024-11 LWG Motion 18 - P1928R15 std::simd — merge data-parallel types from the Parallelism TS 2 #7437

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mattkretz
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Fixes #7430
Fixes cplusplus/papers#670

This is still work-in-progress. Several overfull hboxes to be fixed. Also, I assume the local use of \newcommand macros is not something I should keep, yes?

@jensmaurer
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That needs at least careful scrutiny why they would be necessary.

Please fix the commit title and message according to https://github.com/cplusplus/draft/wiki/Commit-message-format

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no complete, but a start

\end{note}

\pnum
The set of \defn{vectorizable types} comprises all standard integer types,
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Please use \defnadjx so that we get index entries for both "vectorizable type" and "type, vectorizable".

\tcode{std::float64_t} are vectorizable types if defined ([basic.extended.fp]).

\pnum
The term \defn{data-parallel type} refers to all enabled specializations of
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\defnadj


\pnum
The term \defn{data-parallel type} refers to all enabled specializations of
the \tcode{basic_simd} and \tcode{basic_simd_mask} class templates. A \defn{data-parallel object} is
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\defnadj

\pnum
The term \defn{data-parallel type} refers to all enabled specializations of
the \tcode{basic_simd} and \tcode{basic_simd_mask} class templates. A \defn{data-parallel object} is
an object of \term{data-parallel type}.
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Defined phrases are italicized once when defined, and not when referred to. Please remove \term here.

The elements in a data-parallel type are indexed from 0 to $\textrm{width} - 1$.

\pnum
An \defn{element-wise operation} applies a specified operation to the elements of one or more
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\defnadj


\pnum
Given a \tcode{basic_simd_mask<Bytes, Abi>} object \tcode{mask}, the
\defn{selected indices} signify the integers $i$ in the range
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\defnadj

Given a \tcode{basic_simd_mask<Bytes, Abi>} object \tcode{mask}, the
\defn{selected indices} signify the integers $i$ in the range
\range{0}{mask.size()} for which \tcode{mask[$i$]} is \tcode{true}.
Given a data-parallel object \tcode{data}, the \defn{selected elements} signify the elements
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\defnadj

\defn{value-preserving} if
all possible values of \tcode{U} can be represented with type \tcode{T}.

\rSec2[simd.expos]{Exposition only types, variables, and concepts}
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Suggested change
\rSec2[simd.expos]{Exposition only types, variables, and concepts}
\rSec2[simd.expos]{Exposition-only types, variables, and concepts}

@mattkretz mattkretz closed this Nov 25, 2024
@mattkretz mattkretz deleted the P1928R15-simd branch November 25, 2024 11:43
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Ah whatever GitHub. I renamed the branch to match https://github.com/cplusplus/draft/wiki/Commit-message-format. I'll open a new PR.

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