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AK: Add AK::SIMD::exp_approximate

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This approximation tries to generate values within 0.1% of their actual
expected value. Microbenchmarks indicate that this iterative SIMD
version can be up to 60x faster than `AK::SIMD::exp`.
This commit is contained in:
Jelle Raaijmakers 2023-02-17 17:06:03 +01:00 • committed by Andreas Kling
parent 3275d659bf
commit f4342c9118
3 changed files with 43 additions and 0 deletions
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9
AK/SIMDMath.h
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@ -66,6 +66,15 @@ ALWAYS_INLINE static f32x4 exp(f32x4 v)
};
}
ALWAYS_INLINE static f32x4 exp_approximate(f32x4 v)
{
static constexpr int number_of_iterations = 10;
auto result = 1.f + v / (1 << number_of_iterations);
for (int i = 0; i < number_of_iterations; ++i)
result *= result;
return result;
}
ALWAYS_INLINE static f32x4 sqrt(f32x4 v)
{
#if ARCH(x86_64)