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Add fallback SIMD implementation #1342

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Add fallback SIMD implementation #1342

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4 changes: 3 additions & 1 deletion modules/juce_dsp/juce_dsp.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,9 @@
#include "widgets/juce_Chorus.cpp"

#if JUCE_USE_SIMD
#if JUCE_INTEL
#if JUCE_USE_SIMD_FALLBACK
// no extra includes needed for fallback implementation
#elif JUCE_INTEL
#ifdef __AVX2__
#include "native/juce_SIMDNativeOps_avx.cpp"
#else
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17 changes: 14 additions & 3 deletions modules/juce_dsp/juce_dsp.h
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Expand Up @@ -86,13 +86,22 @@

#else

// No SIMD Support
// No native SIMD support; use fallback implementation
#ifndef JUCE_USE_SIMD_FALLBACK
#define JUCE_USE_SIMD_FALLBACK 1
#endif

#ifndef JUCE_USE_SIMD
#define JUCE_USE_SIMD 0
#define JUCE_USE_SIMD JUCE_USE_SIMD_FALLBACK
#endif

#endif

// Ensure macro is defined
#ifndef JUCE_USE_SIMD_FALLBACK
#define JUCE_USE_SIMD_FALLBACK 0
#endif

#ifndef JUCE_VECTOR_CALLTYPE
// __vectorcall does not work on 64-bit due to internal compiler error in
// release mode VS2017. Re-enable when Microsoft fixes this
Expand Down Expand Up @@ -225,7 +234,9 @@ namespace util
#include "native/juce_SIMDNativeOps_fallback.h"

// include the correct native file for this build target CPU
#if defined (__i386__) || defined (__amd64__) || defined (_M_X64) || defined (_X86_) || defined (_M_IX86)
#if JUCE_USE_SIMD_FALLBACK
// will use fallback implementation in juce_SIMDNativeOps_fallback.h
#elif defined (__i386__) || defined (__amd64__) || defined (_M_X64) || defined (_X86_) || defined (_M_IX86)
#ifdef __AVX2__
#include "native/juce_SIMDNativeOps_avx.h"
#else
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50 changes: 50 additions & 0 deletions modules/juce_dsp/native/juce_SIMDNativeOps_fallback.h
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Expand Up @@ -261,4 +261,54 @@ struct SIMDFallbackOps
}
};

/**
Fallback implementation of SIMD ops. This will be overridden by the
specializations in architecture-specific files.

@tags{DSP}
*/
template <typename ScalarType>
struct SIMDNativeOps
{
using vSIMDType = std::array<uint64_t, 2>;
using fb = SIMDFallbackOps<ScalarType, vSIMDType>;

static forcedinline vSIMDType expand (ScalarType s) noexcept { return fb::expand (s); }
static forcedinline vSIMDType load (const ScalarType* a) noexcept { return fb::load (a); }
static forcedinline void store (vSIMDType value, ScalarType* dest) noexcept { return fb::store (value, dest); }
static forcedinline vSIMDType add (vSIMDType a, vSIMDType b) noexcept { return fb::add (a, b); }
static forcedinline vSIMDType sub (vSIMDType a, vSIMDType b) noexcept { return fb::sub (a, b); }
static forcedinline vSIMDType mul (vSIMDType a, vSIMDType b) noexcept { return fb::mul (a, b); }
static forcedinline vSIMDType bit_and (vSIMDType a, vSIMDType b) noexcept { return fb::bit_and (a, b); }
static forcedinline vSIMDType bit_or (vSIMDType a, vSIMDType b) noexcept { return fb::bit_or (a, b); }
static forcedinline vSIMDType bit_xor (vSIMDType a, vSIMDType b) noexcept { return fb::bit_xor (a, b); }
static forcedinline vSIMDType bit_notand (vSIMDType a, vSIMDType b) noexcept { return fb::bit_notand (a, b); }
static forcedinline vSIMDType bit_not (vSIMDType a) noexcept { return fb::bit_not (a); }
static forcedinline vSIMDType min (vSIMDType a, vSIMDType b) noexcept { return fb::min (a, b); }
static forcedinline vSIMDType max (vSIMDType a, vSIMDType b) noexcept { return fb::max (a, b); }
static forcedinline vSIMDType equal (vSIMDType a, vSIMDType b) noexcept { return fb::equal (a, b); }
static forcedinline vSIMDType notEqual (vSIMDType a, vSIMDType b) noexcept { return fb::notEqual (a, b); }
static forcedinline vSIMDType greaterThan (vSIMDType a, vSIMDType b) noexcept { return fb::greaterThan (a, b); }
static forcedinline vSIMDType greaterThanOrEqual (vSIMDType a, vSIMDType b) noexcept { return fb::greaterThanOrEqual (a, b); }
static forcedinline bool allEqual (vSIMDType a, vSIMDType b) noexcept { return fb::allEqual (a, b); }
static forcedinline vSIMDType multiplyAdd (vSIMDType a, vSIMDType b, vSIMDType c) noexcept { return fb::multiplyAdd (a, b, c); }
static forcedinline ScalarType get (vSIMDType v, size_t i) noexcept { return fb::get (v, i); }
static forcedinline vSIMDType set (vSIMDType v, size_t i, ScalarType s) noexcept { return fb::set (v, i, s); }
static forcedinline vSIMDType truncate (vSIMDType a) noexcept { return fb::truncate (a); }
static forcedinline vSIMDType cmplxmul (vSIMDType a, vSIMDType b) noexcept { return fb::cmplxmul (a, b); }
static forcedinline ScalarType sum (vSIMDType a) noexcept { return fb::sum (a); }

static forcedinline vSIMDType oddevensum (vSIMDType a) noexcept
{
if (fb::n <= 2)
return a;
ScalarType sums[2] = {};
for (size_t i = 0; i < fb::n; ++i)
sums[i % 2] += get (a, i);
for (size_t i = 0; i < fb::n; ++i)
a = set (a, i, sums[i % 2]);
return a;
}
};

} // namespace juce::dsp