mirror of
https://github.com/php/php-src.git
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111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Xinchen Hui <xinchen.h@zend.com> |
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+----------------------------------------------------------------------+
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*/
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#include "zend_cpuinfo.h"
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typedef struct _zend_cpu_info {
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uint32_t eax;
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uint32_t ebx;
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uint32_t ecx;
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uint32_t edx;
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uint32_t initialized;
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} zend_cpu_info;
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static zend_cpu_info cpuinfo = {0};
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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# if defined(HAVE_CPUID_H) && defined(HAVE_CPUID_COUNT)
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# include <cpuid.h>
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static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
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__cpuid_count(func, subfunc, cpuinfo->eax, cpuinfo->ebx, cpuinfo->ecx, cpuinfo->edx);
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}
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# else
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static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
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#if defined(__i386__) && (defined(__pic__) || defined(__PIC__))
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/* PIC on i386 uses %ebx, so preserve it. */
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__asm__ __volatile__ (
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"pushl %%ebx\n"
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"cpuid\n"
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"mov %%ebx,%1\n"
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"popl %%ebx"
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: "=a"(cpuinfo->eax), "=r"(cpuinfo->ebx), "=c"(cpuinfo->ecx), "=d"(cpuinfo->edx)
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: "a"(func), "c"(subfunc)
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);
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#else
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__asm__ __volatile__ (
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"cpuid"
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: "=a"(cpuinfo->eax), "=b"(cpuinfo->ebx), "=c"(cpuinfo->ecx), "=d"(cpuinfo->edx)
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: "a"(func), "c"(subfunc)
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);
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#endif
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}
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# endif
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#elif defined(ZEND_WIN32) && !defined(__clang__)
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# include <intrin.h>
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static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
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int regs[4];
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__cpuidex(regs, func, subfunc);
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cpuinfo->eax = regs[0];
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cpuinfo->ebx = regs[1];
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cpuinfo->ecx = regs[2];
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cpuinfo->edx = regs[3];
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}
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#else
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static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
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cpuinfo->eax = 0;
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}
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#endif
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void zend_cpu_startup(void)
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{
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if (!cpuinfo.initialized) {
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zend_cpu_info ebx;
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int max_feature;
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cpuinfo.initialized = 1;
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__zend_cpuid(0, 0, &cpuinfo);
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max_feature = cpuinfo.eax;
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if (max_feature == 0) {
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return;
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}
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__zend_cpuid(1, 0, &cpuinfo);
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/* for avx2 */
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if (max_feature >= 7) {
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__zend_cpuid(7, 0, &ebx);
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cpuinfo.ebx = ebx.ebx;
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} else {
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cpuinfo.ebx = 0;
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}
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}
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}
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ZEND_API int zend_cpu_supports(zend_cpu_feature feature) {
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ZEND_ASSERT(cpuinfo.initialized);
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if (feature & ZEND_CPU_EDX_MASK) {
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return (cpuinfo.edx & (feature & ~ZEND_CPU_EDX_MASK));
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} else if (feature & ZEND_CPU_EBX_MASK) {
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return (cpuinfo.ebx & (feature & ~ZEND_CPU_EBX_MASK));
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} else {
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return (cpuinfo.ecx & feature);
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}
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}
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