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Portable packed SIMD vector types #2948

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Portable packed SIMD vector types #2948

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d817701
rfc: portable packed SIMD vector types
gnzlbg Mar 14, 2018
56d6607
clarify the naming convention for horizontal reductions, or lack thereof
gnzlbg Mar 22, 2018
9a8aac4
propose sane arithmetic and shift operation semantics
gnzlbg Mar 22, 2018
64a3ce6
more prior art, typo fixes,...
gnzlbg Mar 22, 2018
8b69e2a
ocd
gnzlbg Mar 22, 2018
422a454
incorporate feedback from rkruppe and hsivonen
gnzlbg Mar 23, 2018
3bf5d2c
add more vector masks explanations to the guide-level explanation
gnzlbg Mar 23, 2018
1762b58
incorporate latest rkruppe feedback
gnzlbg Mar 23, 2018
ec0810e
formatting
gnzlbg Mar 29, 2018
0a5c438
vector layout; hmin/max->min/max_element; saturating arithmetic
gnzlbg Apr 6, 2018
7da3e00
add fp-vector ops: fma, sqrt, sqrte
gnzlbg May 24, 2018
a3a8bc6
add from implementations vector<-->arrays
gnzlbg May 24, 2018
28105c6
fix bug in the average examples
gnzlbg May 24, 2018
0d3ca37
rename load/store to read/write
gnzlbg Jun 13, 2018
aaab749
be more specific with respect to vector reads/writes
gnzlbg Jun 13, 2018
2074661
gather/scatters
gnzlbg Jun 13, 2018
7011673
semantics of overlapping scatters
gnzlbg Jun 13, 2018
4a09e4e
Add a FAQ section and update the intro sections a bit.
hsivonen Jun 24, 2020
929d399
Fix errors.
hsivonen Jun 25, 2020
8800e41
Amend the FAQ.
hsivonen Jun 25, 2020
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more prior art, typo fixes,...
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@gnzlbg
gnzlbg committed Mar 22, 2018
commit 64a3ce62440a32e8a6a21ea00ed9ea4ea1d5cdc8
24 changes: 15 additions & 9 deletions text/0000-ppv.md
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Expand Up @@ -554,7 +554,7 @@ methods which, on overflow, produce the correct mathematical result modulo `2^n`

If any of the vector elements is divided by zero the behavior is undefined.

#### Binary minmax vertical operations
#### Binary `min`/`max` vertical operations

All portable signed integer, unsigned integer, and floating-point vectors
implement the following methods:
Expand Down Expand Up @@ -1244,15 +1244,21 @@ If there is consensus for it the RFC can be easily amended.
# Prior art
[prior-art]: #prior-art

All of this is implemented in `stdsimd` and can be used on nightly today via the
`std::simd` module. The `stdsimd` crate is an effort started by @burntsushi to
put the `rust-lang-nursery/simd` crate into a state suitable for stabilization.
The `rust-lang-nursery/simd` crate was mainly developed by @huonw and IIRC it is
heavily-inspired by Dart's SIMD which is from where the `f32x4` naming scheme
comes from. This RFC has been heavily inspired by Dart, and two of the three
examples used in the motivation come from the [Using SIMD in
Most of this is implemented in `stdsimd` and can be used on nightly today via
the `std::simd` module. The `stdsimd` crate is an effort started by @burntsushi
to put the `rust-lang-nursery/simd` crate into a state suitable for
stabilization. The `rust-lang-nursery/simd` crate was mainly developed by @huonw
and IIRC it is heavily-inspired by Dart's SIMD which is from where the `f32x4`
naming scheme comes from. This RFC has been heavily inspired by Dart, and two of
the three examples used in the motivation come from the [Using SIMD in
Dart](https://www.dartlang.org/articles/dart-vm/simd) article written by John
McCutchan.
McCutchan. Some of the key ideas of this RFC come from LLVM's design, which was
originally inspired by GCC's vector extensions, which was probably inspired by
something else.

Or in other words: to the author's best knowledge, this RFC does not contain any
really novel ideas. Instead, it only draws inspriation from previous designs
that have withstood the test of time, and it adapts these designs to Rust.

# Unresolved questions
[unresolved]: #unresolved-questions
Expand Down