mirror of
https://github.com/saymrwulf/pytorch.git
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8286ce1e3a
Summary: Closes https://github.com/caffe2/caffe2/pull/1260 Differential Revision: D5906739 Pulled By: Yangqing fbshipit-source-id: e482ba9ba60b5337d9165f28f7ec68d4518a0902
96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
/**
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* Copyright (c) 2016-present, Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "caffe2/utils/cpuid.h"
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namespace caffe2 {
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const CpuId& GetCpuId() {
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static CpuId cpuid_singleton;
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return cpuid_singleton;
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}
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uint32_t CpuId::f1c_ = 0;
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uint32_t CpuId::f1d_ = 0;
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uint32_t CpuId::f7b_ = 0;
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uint32_t CpuId::f7c_ = 0;
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CpuId::CpuId() {
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#ifdef _MSC_VER
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int reg[4];
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__cpuid(static_cast<int*>(reg), 0);
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const int n = reg[0];
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if (n >= 1) {
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__cpuid(static_cast<int*>(reg), 1);
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f1c_ = uint32_t(reg[2]);
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f1d_ = uint32_t(reg[3]);
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}
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if (n >= 7) {
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__cpuidex(static_cast<int*>(reg), 7, 0);
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f7b_ = uint32_t(reg[1]);
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f7c_ = uint32_t(reg[2]);
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}
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#elif defined(__i386__) && defined(__PIC__) && !defined(__clang__) && \
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defined(__GNUC__)
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// The following block like the normal cpuid branch below, but gcc
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// reserves ebx for use of its pic register so we must specially
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// handle the save and restore to avoid clobbering the register
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uint32_t n;
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__asm__(
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"pushl %%ebx\n\t"
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"cpuid\n\t"
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"popl %%ebx\n\t"
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: "=a"(n)
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: "a"(0)
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: "ecx", "edx");
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if (n >= 1) {
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uint32_t f1a;
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__asm__(
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"pushl %%ebx\n\t"
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"cpuid\n\t"
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"popl %%ebx\n\t"
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: "=a"(f1a), "=c"(f1c_), "=d"(f1d_)
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: "a"(1)
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:);
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}
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if (n >= 7) {
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__asm__(
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"pushl %%ebx\n\t"
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"cpuid\n\t"
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"movl %%ebx, %%eax\n\r"
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"popl %%ebx"
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: "=a"(f7b_), "=c"(f7c_)
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: "a"(7), "c"(0)
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: "edx");
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}
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#elif defined(__x86_64__) || defined(_M_X64) || defined(__i386__)
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uint32_t n;
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__asm__("cpuid" : "=a"(n) : "a"(0) : "ebx", "ecx", "edx");
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if (n >= 1) {
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uint32_t f1a;
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__asm__("cpuid" : "=a"(f1a), "=c"(f1c_), "=d"(f1d_) : "a"(1) : "ebx");
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}
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if (n >= 7) {
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uint32_t f7a;
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__asm__("cpuid"
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: "=a"(f7a), "=b"(f7b_), "=c"(f7c_)
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: "a"(7), "c"(0)
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: "edx");
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}
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#endif
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}
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} // namespace caffe2
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