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livetrax/libs/appleutility/CoreAudio/PublicUtility/CAVectorUnit.cpp

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/*
File: CAVectorUnit.cpp
Abstract: CAVectorUnit.h
Version: 1.1
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
#include "CAVectorUnit.h"
#if !TARGET_OS_WIN32
#include <sys/sysctl.h>
#elif HAS_IPP
#include "ippdefs.h"
#include "ippcore.h"
#endif
int gCAVectorUnitType = kVecUninitialized;
#if TARGET_OS_WIN32
// Use cpuid to check if SSE2 is available.
// Before calling this function make sure cpuid is available
static SInt32 IsSSE2Available()
{
int return_value;
{
int r_edx;
_asm
{
mov eax, 0x01
cpuid
mov r_edx, edx
}
return_value = (r_edx >> 26) & 0x1;
}
return return_value;
}
// Use cpuid to check if SSE3 is available.
// Before calling this function make sure cpuid is available
static SInt32 IsSSE3Available()
{
SInt32 return_value;
{
SInt32 r_ecx;
_asm
{
mov eax, 0x01
cpuid
mov r_ecx, ecx
}
return_value = r_ecx & 0x1;
}
return return_value;
}
// Return true if the cpuid instruction is available.
// The cpuid instruction is available if bit 21 in the EFLAGS register can be changed
// This function may not work on Intel CPUs prior to Pentium (didn't test)
static bool IsCpuidAvailable()
{
SInt32 return_value = 0x0;
_asm{
pushfd ; //push original EFLAGS
pop eax ; //get original EFLAGS
mov ecx, eax ; //save original EFLAGS
xor eax, 200000h ; //flip ID bit in EFLAGS
push eax ; //save new EFLAGS value on stack
popfd ; //replace current EFLAGS value
pushfd ; //get new EFLAGS
pop eax ; //store new EFLAGS in EAX
xor eax, ecx ;
je end_cpuid_identify ; //can't toggle ID bit
mov return_value, 0x1;
end_cpuid_identify:
nop;
}
return return_value;
}
#endif
SInt32 CAVectorUnit_Examine()
{
int result = kVecNone;
#if TARGET_OS_WIN32
#if HAS_IPP
// Initialize the static IPP library! This needs to be done before
// any IPP function calls, otherwise we may have a performance penalty
int status = ippStaticInit();
if ( status == ippStsNonIntelCpu )
{
IppCpuType cpuType = ippGetCpuType();
if ( cpuType >= ippCpuSSE || cpuType <= ippCpuSSE42 )
ippStaticInitCpu( cpuType );
}
#endif
{
// On Windows we use cpuid to detect the vector unit because it works on Intel and AMD.
// The IPP library does not detect SSE on AMD processors.
if (IsCpuidAvailable())
{
if(IsSSE3Available())
{
result = kVecSSE3;
}
else if(IsSSE2Available())
{
result = kVecSSE2;
}
}
}
#elif TARGET_OS_MAC
#if DEBUG
if (getenv("CA_NoVector")) {
fprintf(stderr, "CA_NoVector set; Vector unit optimized routines will be bypassed\n");
return result;
}
else
#endif
{
#if (TARGET_CPU_PPC || TARGET_CPU_PPC64)
int sels[2] = { CTL_HW, HW_VECTORUNIT };
int vType = 0; //0 == scalar only
size_t length = sizeof(vType);
int error = sysctl(sels, 2, &vType, &length, NULL, 0);
if (!error && vType > 0)
result = kVecAltivec;
#elif (TARGET_CPU_X86 || TARGET_CPU_X86_64)
static const struct { const char* kName; const int kVectype; } kStringVectypes[] = {
{ "hw.optional.avx1_0", kVecAVX1 }, { "hw.optional.sse3", kVecSSE3 }, { "hw.optional.sse2", kVecSSE2 }
};
static const size_t kNumStringVectypes = sizeof(kStringVectypes)/sizeof(kStringVectypes[0]);
int i = 0, answer = 0;
while(i != kNumStringVectypes)
{
size_t length = sizeof(answer);
int error = sysctlbyname(kStringVectypes[i].kName, &answer, &length, NULL, 0);
if (!error && answer)
{
result = kStringVectypes[i].kVectype;
break;
}
++i;
};
#elif CA_ARM_NEON
result = kVecNeon;
#endif
}
#endif
gCAVectorUnitType = result;
return result;
}