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AK: Add introspection helpers to SIMD.h

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(cherry picked from commit 8d6028d366c918b3656c0a4c6808a570dcecf8f4)
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Hendiadyoin1 2024-04-15 20:28:22 +02:00 committed by Andrew Kaster
parent cc6d502e88
commit 9ee334e970
Notes: sideshowbarker 2024-07-18 02:44:35 +09:00 
Author: https://github.com/Hendiadyoin1
Commit: https://github.com/LadybirdBrowser/ladybird/commit/9ee334e9700
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/617
1 changed files with 52 additions and 0 deletions
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52
AK/SIMD.h
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@ -6,6 +6,7 @@
#pragma once
#include <AK/StdLibExtras.h>
#include <AK/Types.h>
namespace AK::SIMD {
@ -61,4 +62,55 @@ using f32x8 = float __attribute__((vector_size(32)));
using f64x2 = double __attribute__((vector_size(16)));
using f64x4 = double __attribute__((vector_size(32)));
// FIXME: Is this really the best/simplest way?
// Ideally we should look for the presence of the vector_size attribute instead
// FIXME: This cannot just be vector as that would somehow clash with AK::Vector, even without being exported
template<typename T>
concept SIMDVector = requires { __builtin_convertvector(declval<T>(), T); };
template<typename T>
using ElementOf = RemoveReference<decltype(declval<T>()[0])>;
static_assert(IsSame<ElementOf<i8x4>, i8>);
static_assert(IsSame<ElementOf<f32x4>, float>);
template<SIMDVector V>
constexpr static size_t vector_length = sizeof(V) / sizeof(ElementOf<V>);
static_assert(vector_length<i8x4> == 4);
static_assert(vector_length<f32x4> == 4);
namespace Detail {
template<typename T>
struct IndexVectorFor;
template<SIMDVector T>
requires(IsIntegral<ElementOf<T>>)
struct IndexVectorFor<T> {
using Type = T;
};
template<SIMDVector T>
requires(IsFloatingPoint<ElementOf<T>>)
struct IndexVectorFor<T> {
using Type = Conditional<
IsSame<ElementOf<T>, float>,
u32 __attribute__((vector_size(sizeof(T)))),
u64 __attribute__((vector_size(sizeof(T))))>;
};
}
template<SIMDVector T>
using IndexVectorFor = typename Detail::IndexVectorFor<T>::Type;
static_assert(IsSame<IndexVectorFor<i8x16>, i8x16>);
static_assert(IsSame<IndexVectorFor<u32x4>, u32x4>);
static_assert(IsSame<IndexVectorFor<u64x4>, u64x4>);
#if defined(AK_COMPILER_CLANG)
// FIXME: GCC silently ignores the dependent vector_size attribute, this seems to be a bug
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68703
static_assert(IsSame<IndexVectorFor<f32x4>, u32x4>);
static_assert(IsSame<IndexVectorFor<f64x4>, u64x4>);
#endif
}