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108 lines
2.5 KiB
C++
108 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Math.h>
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#include <AK/SIMD.h>
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#include <AK/SIMDExtras.h>
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#include <math.h>
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// Functions returning vectors or accepting vector arguments have different calling conventions
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// depending on whether the target architecture supports SSE or not. GCC generates warning "psabi"
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// when compiling for non-SSE architectures. We disable this warning because these functions
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// are static and should never be visible from outside the translation unit that includes this header.
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wpsabi"
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namespace AK::SIMD {
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// Functions ending in "_int_range" only accept arguments within range [INT_MIN, INT_MAX].
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// Other inputs will generate unexpected results.
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ALWAYS_INLINE static f32x4 truncate_int_range(f32x4 v)
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{
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return to_f32x4(to_i32x4(v));
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}
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ALWAYS_INLINE static f32x4 floor_int_range(f32x4 v)
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{
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auto t = truncate_int_range(v);
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return t > v ? t - 1.0f : t;
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}
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ALWAYS_INLINE static f32x4 ceil_int_range(f32x4 v)
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{
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auto t = truncate_int_range(v);
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return t < v ? t + 1.0f : t;
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}
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ALWAYS_INLINE static f32x4 frac_int_range(f32x4 v)
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{
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return v - floor_int_range(v);
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}
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ALWAYS_INLINE static f32x4 clamp(f32x4 v, f32x4 min, f32x4 max)
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{
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return v < min ? min : (v > max ? max : v);
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}
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ALWAYS_INLINE static f32x4 clamp(f32x4 v, float min, float max)
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{
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return v < min ? min : (v > max ? max : v);
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}
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ALWAYS_INLINE static f32x4 exp(f32x4 v)
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{
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// FIXME: This should be replaced with a vectorized algorithm instead of calling the scalar expf 4 times
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return f32x4 {
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expf(v[0]),
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expf(v[1]),
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expf(v[2]),
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expf(v[3]),
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};
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}
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ALWAYS_INLINE static f32x4 exp_approximate(f32x4 v)
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{
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static constexpr int number_of_iterations = 10;
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auto result = 1.f + v / (1 << number_of_iterations);
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for (int i = 0; i < number_of_iterations; ++i)
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result *= result;
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return result;
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}
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ALWAYS_INLINE static f32x4 sqrt(f32x4 v)
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{
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#if ARCH(X86_64)
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return __builtin_ia32_sqrtps(v);
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#else
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return f32x4 {
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AK::sqrt(v[0]),
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AK::sqrt(v[1]),
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AK::sqrt(v[2]),
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AK::sqrt(v[3]),
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};
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#endif
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}
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ALWAYS_INLINE static f32x4 rsqrt(f32x4 v)
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{
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#if ARCH(X86_64)
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return __builtin_ia32_rsqrtps(v);
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#else
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return f32x4 {
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1.f / AK::sqrt(v[0]),
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1.f / AK::sqrt(v[1]),
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1.f / AK::sqrt(v[2]),
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1.f / AK::sqrt(v[3]),
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};
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#endif
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}
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}
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#pragma GCC diagnostic pop
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