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#511 Added dynamic popcnt dispatcher

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This commit is contained in:
Waldemar Pawlaszek 2022-07-31 11:33:38 +02:00
parent b7656d5c7b
commit 6ff51ce8f3
1 changed files with 40 additions and 23 deletions
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63
src/engine/platform/sound/lynx/Mikey.cpp
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@ -26,6 +26,24 @@
#include <algorithm>
#include <limits>
#if defined ( _MSC_VER )
#include <intrin.h>
static void cpuid( int info[4], int infoType )
{
__cpuidex( info, infoType, 0 );
}
#else
#include <cpuid.h>
static void cpuid( int info[4], int infoType )
{
__cpuid_count( infoType, 0, info[0], info[1], info[2], info[3] );
}
#endif
namespace Lynx
{
@ -34,29 +52,7 @@ namespace
static constexpr int64_t CNT_MAX = std::numeric_limits<int64_t>::max() & ~15;
#if defined ( __cpp_lib_bitops )
#define popcnt(X) std::popcount(X)
#elif defined( _MSC_VER )
# include <intrin.h>
uint32_t popcnt( uint32_t x )
{
return __popcnt( x );
}
#elif defined( __GNUC__ )
uint32_t popcnt( uint32_t x )
{
return __builtin_popcount( x );
}
#else
uint32_t popcnt( uint32_t x )
uint32_t popcnt_generic( uint32_t x )
{
int v = 0;
while ( x != 0 )
@ -67,7 +63,16 @@ uint32_t popcnt( uint32_t x )
return v;
}
uint32_t popcnt_intrinsic( uint32_t x )
{
#if defined ( _MSC_VER )
return __popcnt( x );
#else
return __builtin_popcount( x );
#endif
}
static uint32_t( *popcnt )( uint32_t x );
int32_t clamp( int32_t v, int32_t lo, int32_t hi )
{
@ -514,6 +519,18 @@ private:
Mikey::Mikey( uint32_t sampleRate ) : mMikey{ std::make_unique<MikeyPimpl>() }, mQueue{ std::make_unique<ActionQueue>() }, mTick{}, mNextTick{}, mSampleRate{ sampleRate }, mSamplesRemainder{}, mTicksPerSample{ 16000000 / mSampleRate, 16000000 % mSampleRate }
{
enqueueSampling();
//detecting popcnt availability
int info[4];
cpuid( info, 1 );
if ( ( info[2] & ( (int)1 << 23 ) ) != 0 )
{
popcnt = &popcnt_intrinsic;
}
else
{
popcnt = &popcnt_generic;
}
}
Mikey::~Mikey()