root/platform/unix/unixcpuid.cpp

DEFINITIONS

1. HasCPUIDsupport
2. GetFeatureFlags
3. P4Available
4. P4Available

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is [Open Source Virtual Machine.].
 *
 * The Initial Developer of the Original Code is
 * Adobe System Incorporated.
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 * the Initial Developer. All Rights Reserved.
 *
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#include "avmplus.h"

#ifdef FEATURE_NANOJIT

#if defined(AVMPLUS_IA32)

#define SSE_FLAG  0x02000000            // SSE flag is bit 25 of Feature Flags
#define SSE2_FLAG 0x04000000            // SSE2 flag is bit 26 of Feature Flags

static bool HasCPUIDsupport()
{
        unsigned int f1, f2;
        const unsigned int flag = 0x200000;
        asm("pushfl\n\t"
            "pushfl\n\t"
            "popl %0\n\t"
            "movl %0,%1\n\t"
            "xorl %2,%0\n\t"
            "pushl %0\n\t"
            "popfl\n\t"
            "pushfl\n\t"
            "popl %0\n\t"
            "popfl\n\t"
            : "=&r" (f1), "=&r" (f2)
            : "ir" (flag));
        return ((f1^f2) & flag) != 0;
}

static unsigned int GetFeatureFlags()
{
        int dwCPUFeatureFlags = 0x00000000;
        if (HasCPUIDsupport())
        {
                __asm__ (       "pushl %%ebx\n\t"
                                        "movl $1, %%eax\n\t"
                                        "cpuid\n\t"     
                                        "popl %%ebx\n\t"
                                  : "=d" (dwCPUFeatureFlags) : "0" (1) : "eax", "ecx", "cc");
        }
        return dwCPUFeatureFlags;
} // GetFeatureFlags()

bool P4Available()
{
        static int checked = 0;
        if ( !checked ) {
                unsigned int dwFeatures = GetFeatureFlags();
                if (dwFeatures & SSE2_FLAG) {
                        checked = 2;
                        return true;
                }
                checked = 1;
        }
        if ( checked == 2 ) {
                return true;
        }
        return false;
} // P4Available()

#elif defined(AVMPLUS_AMD64)

bool P4Available()
{
        return true;
}

#endif

#endif // FEATURE_NANOJIT