mirror of
https://github.com/juce-framework/JUCE.git
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261 lines
10 KiB
C++
261 lines
10 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE 6 technical preview.
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Copyright (c) 2017 - ROLI Ltd.
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You may use this code under the terms of the GPL v3
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(see www.gnu.org/licenses).
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For this technical preview, this file is not subject to commercial licensing.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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namespace dsp
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{
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/** A template specialisation to find corresponding mask type for primitives. */
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namespace SIMDInternal
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{
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template <typename Primitive> struct MaskTypeFor { using type = Primitive; };
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template <> struct MaskTypeFor <float> { using type = uint32_t; };
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template <> struct MaskTypeFor <double> { using type = uint64_t; };
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template <> struct MaskTypeFor <char> { using type = uint8_t; };
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template <> struct MaskTypeFor <int8_t> { using type = uint8_t; };
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template <> struct MaskTypeFor <int16_t> { using type = uint16_t; };
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template <> struct MaskTypeFor <int32_t> { using type = uint32_t; };
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template <> struct MaskTypeFor <int64_t> { using type = uint64_t; };
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template <> struct MaskTypeFor <std::complex<float>> { using type = uint32_t; };
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template <> struct MaskTypeFor <std::complex<double>> { using type = uint64_t; };
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template <typename Primitive> struct PrimitiveType { using type = typename std::remove_cv<Primitive>::type; };
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template <typename Primitive> struct PrimitiveType<std::complex<Primitive>> { using type = typename std::remove_cv<Primitive>::type; };
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template <int n> struct Log2Helper { enum { value = Log2Helper<n/2>::value + 1 }; };
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template <> struct Log2Helper<1> { enum { value = 0 }; };
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}
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/**
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Useful fallback routines to use if the native SIMD op is not supported. You
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should never need to use this directly. Use juce_SIMDRegister instead.
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@tags{DSP}
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*/
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template <typename ScalarType, typename vSIMDType>
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struct SIMDFallbackOps
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{
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static constexpr size_t n = sizeof (vSIMDType) / sizeof (ScalarType);
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static constexpr size_t mask = (sizeof (vSIMDType) / sizeof (ScalarType)) - 1;
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static constexpr size_t bits = SIMDInternal::Log2Helper<(int) n>::value;
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// helper types
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using MaskType = typename SIMDInternal::MaskTypeFor<ScalarType>::type;
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union UnionType { vSIMDType v; ScalarType s[n]; };
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union UnionMaskType { vSIMDType v; MaskType m[n]; };
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// fallback methods
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static forcedinline vSIMDType add (vSIMDType a, vSIMDType b) noexcept { return apply<ScalarAdd> (a, b); }
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static forcedinline vSIMDType sub (vSIMDType a, vSIMDType b) noexcept { return apply<ScalarSub> (a, b); }
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static forcedinline vSIMDType mul (vSIMDType a, vSIMDType b) noexcept { return apply<ScalarMul> (a, b); }
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static forcedinline vSIMDType bit_and (vSIMDType a, vSIMDType b) noexcept { return bitapply<ScalarAnd> (a, b); }
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static forcedinline vSIMDType bit_or (vSIMDType a, vSIMDType b) noexcept { return bitapply<ScalarOr > (a, b); }
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static forcedinline vSIMDType bit_xor (vSIMDType a, vSIMDType b) noexcept { return bitapply<ScalarXor> (a, b); }
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static forcedinline vSIMDType bit_notand (vSIMDType a, vSIMDType b) noexcept { return bitapply<ScalarNot> (a, b); }
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static forcedinline vSIMDType min (vSIMDType a, vSIMDType b) noexcept { return apply<ScalarMin> (a, b); }
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static forcedinline vSIMDType max (vSIMDType a, vSIMDType b) noexcept { return apply<ScalarMax> (a, b); }
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static forcedinline vSIMDType equal (vSIMDType a, vSIMDType b) noexcept { return cmp<ScalarEq > (a, b); }
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static forcedinline vSIMDType notEqual (vSIMDType a, vSIMDType b) noexcept { return cmp<ScalarNeq> (a, b); }
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static forcedinline vSIMDType greaterThan (vSIMDType a, vSIMDType b) noexcept { return cmp<ScalarGt > (a, b); }
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static forcedinline vSIMDType greaterThanOrEqual (vSIMDType a, vSIMDType b) noexcept { return cmp<ScalarGeq> (a, b); }
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static forcedinline ScalarType get (vSIMDType v, size_t i) noexcept
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{
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UnionType u {v};
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return u.s[i];
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}
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static forcedinline vSIMDType set (vSIMDType v, size_t i, ScalarType s) noexcept
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{
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UnionType u {v};
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u.s[i] = s;
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return u.v;
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}
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static forcedinline vSIMDType bit_not (vSIMDType av) noexcept
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{
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UnionMaskType a {av};
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for (size_t i = 0; i < n; ++i)
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a.m[i] = ~a.m[i];
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return a.v;
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}
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static forcedinline ScalarType sum (vSIMDType av) noexcept
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{
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UnionType a {av};
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auto retval = static_cast<ScalarType> (0);
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for (size_t i = 0; i < n; ++i)
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retval = static_cast<ScalarType> (retval + a.s[i]);
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return retval;
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}
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static forcedinline vSIMDType truncate (vSIMDType av) noexcept
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{
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UnionType a {av};
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for (size_t i = 0; i < n; ++i)
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{
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jassert (a.s[i] >= ScalarType (0));
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a.s[i] = static_cast <ScalarType> (static_cast<int> (a.s[i]));
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}
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return a.v;
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}
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static forcedinline vSIMDType multiplyAdd (vSIMDType av, vSIMDType bv, vSIMDType cv) noexcept
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{
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UnionType a {av}, b {bv}, c {cv};
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for (size_t i = 0; i < n; ++i)
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a.s[i] += b.s[i] * c.s[i];
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return a.v;
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}
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//==============================================================================
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static forcedinline bool allEqual (vSIMDType av, vSIMDType bv) noexcept
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{
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UnionType a {av}, b {bv};
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for (size_t i = 0; i < n; ++i)
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if (a.s[i] != b.s[i])
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return false;
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return true;
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}
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//==============================================================================
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static forcedinline vSIMDType cmplxmul (vSIMDType av, vSIMDType bv) noexcept
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{
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UnionType a {av}, b {bv}, r;
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const int m = n >> 1;
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for (int i = 0; i < m; ++i)
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{
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std::complex<ScalarType> result
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= std::complex<ScalarType> (a.s[i<<1], a.s[(i<<1)|1])
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* std::complex<ScalarType> (b.s[i<<1], b.s[(i<<1)|1]);
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r.s[i<<1] = result.real();
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r.s[(i<<1)|1] = result.imag();
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}
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return r.v;
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}
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struct ScalarAdd { static forcedinline ScalarType op (ScalarType a, ScalarType b) noexcept { return a + b; } };
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struct ScalarSub { static forcedinline ScalarType op (ScalarType a, ScalarType b) noexcept { return a - b; } };
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struct ScalarMul { static forcedinline ScalarType op (ScalarType a, ScalarType b) noexcept { return a * b; } };
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struct ScalarMin { static forcedinline ScalarType op (ScalarType a, ScalarType b) noexcept { return jmin (a, b); } };
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struct ScalarMax { static forcedinline ScalarType op (ScalarType a, ScalarType b) noexcept { return jmax (a, b); } };
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struct ScalarAnd { static forcedinline MaskType op (MaskType a, MaskType b) noexcept { return a & b; } };
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struct ScalarOr { static forcedinline MaskType op (MaskType a, MaskType b) noexcept { return a | b; } };
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struct ScalarXor { static forcedinline MaskType op (MaskType a, MaskType b) noexcept { return a ^ b; } };
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struct ScalarNot { static forcedinline MaskType op (MaskType a, MaskType b) noexcept { return (~a) & b; } };
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struct ScalarEq { static forcedinline bool op (ScalarType a, ScalarType b) noexcept { return (a == b); } };
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struct ScalarNeq { static forcedinline bool op (ScalarType a, ScalarType b) noexcept { return (a != b); } };
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struct ScalarGt { static forcedinline bool op (ScalarType a, ScalarType b) noexcept { return (a > b); } };
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struct ScalarGeq { static forcedinline bool op (ScalarType a, ScalarType b) noexcept { return (a >= b); } };
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// generic apply routines for operations above
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template <typename Op>
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static forcedinline vSIMDType apply (vSIMDType av, vSIMDType bv) noexcept
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{
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UnionType a {av}, b {bv};
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for (size_t i = 0; i < n; ++i)
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a.s[i] = Op::op (a.s[i], b.s[i]);
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return a.v;
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}
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template <typename Op>
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static forcedinline vSIMDType cmp (vSIMDType av, vSIMDType bv) noexcept
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{
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UnionType a {av}, b {bv};
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UnionMaskType r;
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for (size_t i = 0; i < n; ++i)
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r.m[i] = Op::op (a.s[i], b.s[i]) ? static_cast<MaskType> (-1) : static_cast<MaskType> (0);
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return r.v;
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}
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template <typename Op>
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static forcedinline vSIMDType bitapply (vSIMDType av, vSIMDType bv) noexcept
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{
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UnionMaskType a {av}, b {bv};
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for (size_t i = 0; i < n; ++i)
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a.m[i] = Op::op (a.m[i], b.m[i]);
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return a.v;
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}
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static forcedinline vSIMDType expand (ScalarType s) noexcept
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{
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UnionType r;
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for (size_t i = 0; i < n; ++i)
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r.s[i] = s;
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return r.v;
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}
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static forcedinline vSIMDType load (const ScalarType* a) noexcept
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{
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UnionType r;
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for (size_t i = 0; i < n; ++i)
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r.s[i] = a[i];
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return r.v;
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}
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static forcedinline void store (vSIMDType av, ScalarType* dest) noexcept
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{
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UnionType a {av};
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for (size_t i = 0; i < n; ++i)
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dest[i] = a.s[i];
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}
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template <unsigned int shuffle_idx>
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static forcedinline vSIMDType shuffle (vSIMDType av) noexcept
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{
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UnionType a {av}, r;
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// the compiler will unroll this loop and the index can
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// be computed at compile-time, so this will be super fast
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for (size_t i = 0; i < n; ++i)
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r.s[i] = a.s[(shuffle_idx >> (bits * i)) & mask];
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return r.v;
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}
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};
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} // namespace dsp
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} // namespace juce
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