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// SPDX-License-Identifier: Apache-2.0
// ----------------------------------------------------------------------------
// Copyright 2020 Arm Limited
//
// 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.
// ----------------------------------------------------------------------------
#if (ASTCENC_SSE > 0) || (ASTCENC_AVX > 0) || (ASTCENC_POPCNT > 0)
/**
* @brief Platform-specific function implementations.
*
* This module contains functions for querying the host extended ISA support.
*/
#include "astcenc_internal.h"
static int g_cpu_has_sse42 = -1;
static int g_cpu_has_avx2 = -1;
static int g_cpu_has_popcnt = -1;
/* ============================================================================
Platform code for Visual Studio
============================================================================ */
#if defined(_MSC_VER)
#include <intrin.h>
static void detect_cpu_isa()
{
int data[4];
__cpuid(data, 0);
int num_id = data[0];
g_cpu_has_sse42 = 0;
g_cpu_has_popcnt = 0;
if (num_id >= 1)
{
__cpuidex(data, 1, 0);
// SSE42 = Bank 1, ECX, bit 20
g_cpu_has_sse42 = data[2] & (1 << 20) ? 1 : 0;
// POPCNT = Bank 1, ECX, bit 23
g_cpu_has_popcnt = data[2] & (1 << 23) ? 1 : 0;
}
g_cpu_has_avx2 = 0;
if (num_id >= 7)
{
__cpuidex(data, 7, 0);
// AVX2 = Bank 7, EBX, bit 5
g_cpu_has_avx2 = data[1] & (1 << 5) ? 1 : 0;
}
}
/* ============================================================================
Platform code for GCC and Clang
============================================================================ */
#else
#include <cpuid.h>
static void detect_cpu_isa()
{
unsigned int data[4];
g_cpu_has_sse42 = 0;
g_cpu_has_popcnt = 0;
if (__get_cpuid_count(1, 0, &data[0], &data[1], &data[2], &data[3]))
{
// SSE42 = Bank 1, ECX, bit 20
g_cpu_has_sse42 = data[2] & (1 << 20) ? 1 : 0;
// POPCNT = Bank 1, ECX, bit 23
g_cpu_has_popcnt = data[2] & (1 << 23) ? 1 : 0;
}
g_cpu_has_avx2 = 0;
if (__get_cpuid_count(7, 0, &data[0], &data[1], &data[2], &data[3]))
{
// AVX2 = Bank 7, EBX, bit 5
g_cpu_has_avx2 = data[1] & (1 << 5) ? 1 : 0;
}
}
#endif
/* Public function, see header file for detailed documentation */
int cpu_supports_sse42()
{
if (g_cpu_has_sse42 == -1)
{
detect_cpu_isa();
}
return g_cpu_has_sse42;
}
/* Public function, see header file for detailed documentation */
int cpu_supports_popcnt()
{
if (g_cpu_has_popcnt == -1)
{
detect_cpu_isa();
}
return g_cpu_has_popcnt;
}
/* Public function, see header file for detailed documentation */
int cpu_supports_avx2()
{
if (g_cpu_has_avx2 == -1)
{
detect_cpu_isa();
}
return g_cpu_has_avx2;
}
#endif
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