alternative new version of the AppleUtility library
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Paul Davis
195
libs/appleutility/CoreAudio/PublicUtility/CAVectorUnit.cpp
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195
libs/appleutility/CoreAudio/PublicUtility/CAVectorUnit.cpp
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/*
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File: CAVectorUnit.cpp
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Abstract: CAVectorUnit.h
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Version: 1.1
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
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license, under Apple's copyrights in this original Apple software (the
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"Apple Software"), to use, reproduce, modify and redistribute the Apple
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Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
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without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or
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implied, are granted by Apple herein, including but not limited to any
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patent rights that may be infringed by your derivative works or by other
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works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
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*/
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#include "CAVectorUnit.h"
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#if !TARGET_OS_WIN32
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#include <sys/sysctl.h>
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#elif HAS_IPP
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#include "ippdefs.h"
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#include "ippcore.h"
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#endif
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int gCAVectorUnitType = kVecUninitialized;
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#if TARGET_OS_WIN32
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// Use cpuid to check if SSE2 is available.
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// Before calling this function make sure cpuid is available
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static SInt32 IsSSE2Available()
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{
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int return_value;
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{
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int r_edx;
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_asm
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{
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mov eax, 0x01
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cpuid
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mov r_edx, edx
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}
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return_value = (r_edx >> 26) & 0x1;
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}
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return return_value;
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}
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// Use cpuid to check if SSE3 is available.
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// Before calling this function make sure cpuid is available
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static SInt32 IsSSE3Available()
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{
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SInt32 return_value;
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{
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SInt32 r_ecx;
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_asm
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{
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mov eax, 0x01
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cpuid
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mov r_ecx, ecx
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}
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return_value = r_ecx & 0x1;
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}
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return return_value;
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}
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// Return true if the cpuid instruction is available.
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// The cpuid instruction is available if bit 21 in the EFLAGS register can be changed
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// This function may not work on Intel CPUs prior to Pentium (didn't test)
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static bool IsCpuidAvailable()
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{
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SInt32 return_value = 0x0;
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_asm{
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pushfd ; //push original EFLAGS
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pop eax ; //get original EFLAGS
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mov ecx, eax ; //save original EFLAGS
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xor eax, 200000h ; //flip ID bit in EFLAGS
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push eax ; //save new EFLAGS value on stack
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popfd ; //replace current EFLAGS value
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pushfd ; //get new EFLAGS
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pop eax ; //store new EFLAGS in EAX
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xor eax, ecx ;
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je end_cpuid_identify ; //can't toggle ID bit
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mov return_value, 0x1;
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end_cpuid_identify:
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nop;
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}
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return return_value;
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}
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#endif
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SInt32 CAVectorUnit_Examine()
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{
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int result = kVecNone;
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#if TARGET_OS_WIN32
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#if HAS_IPP
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// Initialize the static IPP library! This needs to be done before
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// any IPP function calls, otherwise we may have a performance penalty
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int status = ippStaticInit();
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if ( status == ippStsNonIntelCpu )
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{
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IppCpuType cpuType = ippGetCpuType();
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if ( cpuType >= ippCpuSSE || cpuType <= ippCpuSSE42 )
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ippStaticInitCpu( cpuType );
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}
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#endif
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{
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// On Windows we use cpuid to detect the vector unit because it works on Intel and AMD.
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// The IPP library does not detect SSE on AMD processors.
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if (IsCpuidAvailable())
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{
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if(IsSSE3Available())
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{
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result = kVecSSE3;
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}
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else if(IsSSE2Available())
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{
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result = kVecSSE2;
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}
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}
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}
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#elif TARGET_OS_MAC
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#if DEBUG
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if (getenv("CA_NoVector")) {
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fprintf(stderr, "CA_NoVector set; Vector unit optimized routines will be bypassed\n");
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return result;
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}
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else
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#endif
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{
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#if (TARGET_CPU_PPC || TARGET_CPU_PPC64)
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int sels[2] = { CTL_HW, HW_VECTORUNIT };
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int vType = 0; //0 == scalar only
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size_t length = sizeof(vType);
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int error = sysctl(sels, 2, &vType, &length, NULL, 0);
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if (!error && vType > 0)
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result = kVecAltivec;
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#elif (TARGET_CPU_X86 || TARGET_CPU_X86_64)
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static const struct { const char* kName; const int kVectype; } kStringVectypes[] = {
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{ "hw.optional.avx1_0", kVecAVX1 }, { "hw.optional.sse3", kVecSSE3 }, { "hw.optional.sse2", kVecSSE2 }
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};
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static const size_t kNumStringVectypes = sizeof(kStringVectypes)/sizeof(kStringVectypes[0]);
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int i = 0, answer = 0;
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while(i != kNumStringVectypes)
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{
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size_t length = sizeof(answer);
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int error = sysctlbyname(kStringVectypes[i].kName, &answer, &length, NULL, 0);
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if (!error && answer)
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{
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result = kStringVectypes[i].kVectype;
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break;
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}
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++i;
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};
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#elif CA_ARM_NEON
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result = kVecNeon;
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#endif
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}
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#endif
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gCAVectorUnitType = result;
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return result;
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}
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