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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "CPUID.hpp"
#if defined(_WIN32)
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
# include <intrin.h>
# include <float.h>
#else
# include <unistd.h>
# include <sched.h>
# include <sys/types.h>
#endif
namespace sw {
static void cpuid(int registers[4], int info)
{
#if defined(__i386__) || defined(__x86_64__)
# if defined(_WIN32)
__cpuid(registers, info);
# else
__asm volatile("cpuid"
: "=a"(registers[0]), "=b"(registers[1]), "=c"(registers[2]), "=d"(registers[3])
: "a"(info));
# endif
#else
registers[0] = 0;
registers[1] = 0;
registers[2] = 0;
registers[3] = 0;
#endif
}
bool CPUID::supportsMMX()
{
int registers[4];
cpuid(registers, 1);
return (registers[3] & 0x00800000) != 0;
}
bool CPUID::supportsCMOV()
{
int registers[4];
cpuid(registers, 1);
return (registers[3] & 0x00008000) != 0;
}
bool CPUID::supportsSSE()
{
int registers[4];
cpuid(registers, 1);
return (registers[3] & 0x02000000) != 0;
}
bool CPUID::supportsSSE2()
{
int registers[4];
cpuid(registers, 1);
return (registers[3] & 0x04000000) != 0;
}
bool CPUID::supportsSSE3()
{
int registers[4];
cpuid(registers, 1);
return (registers[2] & 0x00000001) != 0;
}
bool CPUID::supportsSSSE3()
{
int registers[4];
cpuid(registers, 1);
return (registers[2] & 0x00000200) != 0;
}
bool CPUID::supportsSSE4_1()
{
int registers[4];
cpuid(registers, 1);
return (registers[2] & 0x00080000) != 0;
}
int CPUID::coreCount()
{
int cores = 0;
#if defined(_WIN32)
DWORD_PTR processAffinityMask = 1;
DWORD_PTR systemAffinityMask = 1;
GetProcessAffinityMask(GetCurrentProcess(), &processAffinityMask, &systemAffinityMask);
while(systemAffinityMask)
{
if(systemAffinityMask & 1)
{
cores++;
}
systemAffinityMask >>= 1;
}
#else
cores = sysconf(_SC_NPROCESSORS_ONLN);
#endif
if(cores < 1) cores = 1;
if(cores > 16) cores = 16;
return cores; // FIXME: Number of physical cores
}
int CPUID::processAffinity()
{
int cores = 0;
#if defined(_WIN32)
DWORD_PTR processAffinityMask = 1;
DWORD_PTR systemAffinityMask = 1;
GetProcessAffinityMask(GetCurrentProcess(), &processAffinityMask, &systemAffinityMask);
while(processAffinityMask)
{
if(processAffinityMask & 1)
{
cores++;
}
processAffinityMask >>= 1;
}
#else
return coreCount(); // FIXME: Assumes no affinity limitation
#endif
if(cores < 1) cores = 1;
if(cores > 16) cores = 16;
return cores;
}
void CPUID::setFlushToZero(bool enable)
{
#if defined(_MSC_VER)
_controlfp(enable ? _DN_FLUSH : _DN_SAVE, _MCW_DN);
#else
// Unimplemented
#endif
}
void CPUID::setDenormalsAreZero(bool enable)
{
// Unimplemented
}
} // namespace sw