219 lines
6.6 KiB
C++
219 lines
6.6 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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#pragma once
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#include <cstdint>
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#include <folly/Portability.h>
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#ifdef _MSC_VER
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#include <intrin.h>
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#endif
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namespace folly {
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/**
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* Identification of an Intel CPU.
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* Supports CPUID feature flags (EAX=1) and extended features (EAX=7, ECX=0).
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* Values from
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* http://www.intel.com/content/www/us/en/processors/processor-identification-cpuid-instruction-note.html
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*/
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class CpuId {
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public:
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// Always inline in order for this to be usable from a __ifunc__.
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// In shared library mode, a __ifunc__ runs at relocation time, while the
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// PLT hasn't been fully populated yet; thus, ifuncs cannot use symbols
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// with potentially external linkage. (This issue is less likely in opt
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// mode since inlining happens more likely, and it doesn't happen for
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// statically linked binaries which don't depend on the PLT)
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FOLLY_ALWAYS_INLINE CpuId() {
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#if defined(_MSC_VER) && (FOLLY_X64 || defined(_M_IX86))
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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 FOLLY_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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#define FOLLY_DETAIL_CPUID_X(name, r, bit) \
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FOLLY_ALWAYS_INLINE bool name() const { \
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return ((r) & (1U << bit)) != 0; \
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}
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// cpuid(1): Processor Info and Feature Bits.
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#define FOLLY_DETAIL_CPUID_C(name, bit) FOLLY_DETAIL_CPUID_X(name, f1c_, bit)
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FOLLY_DETAIL_CPUID_C(sse3, 0)
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FOLLY_DETAIL_CPUID_C(pclmuldq, 1)
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FOLLY_DETAIL_CPUID_C(dtes64, 2)
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FOLLY_DETAIL_CPUID_C(monitor, 3)
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FOLLY_DETAIL_CPUID_C(dscpl, 4)
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FOLLY_DETAIL_CPUID_C(vmx, 5)
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FOLLY_DETAIL_CPUID_C(smx, 6)
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FOLLY_DETAIL_CPUID_C(eist, 7)
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FOLLY_DETAIL_CPUID_C(tm2, 8)
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FOLLY_DETAIL_CPUID_C(ssse3, 9)
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FOLLY_DETAIL_CPUID_C(cnxtid, 10)
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FOLLY_DETAIL_CPUID_C(fma, 12)
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FOLLY_DETAIL_CPUID_C(cx16, 13)
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FOLLY_DETAIL_CPUID_C(xtpr, 14)
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FOLLY_DETAIL_CPUID_C(pdcm, 15)
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FOLLY_DETAIL_CPUID_C(pcid, 17)
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FOLLY_DETAIL_CPUID_C(dca, 18)
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FOLLY_DETAIL_CPUID_C(sse41, 19)
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FOLLY_DETAIL_CPUID_C(sse42, 20)
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FOLLY_DETAIL_CPUID_C(x2apic, 21)
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FOLLY_DETAIL_CPUID_C(movbe, 22)
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FOLLY_DETAIL_CPUID_C(popcnt, 23)
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FOLLY_DETAIL_CPUID_C(tscdeadline, 24)
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FOLLY_DETAIL_CPUID_C(aes, 25)
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FOLLY_DETAIL_CPUID_C(xsave, 26)
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FOLLY_DETAIL_CPUID_C(osxsave, 27)
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FOLLY_DETAIL_CPUID_C(avx, 28)
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FOLLY_DETAIL_CPUID_C(f16c, 29)
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FOLLY_DETAIL_CPUID_C(rdrand, 30)
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#undef FOLLY_DETAIL_CPUID_C
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#define FOLLY_DETAIL_CPUID_D(name, bit) FOLLY_DETAIL_CPUID_X(name, f1d_, bit)
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FOLLY_DETAIL_CPUID_D(fpu, 0)
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FOLLY_DETAIL_CPUID_D(vme, 1)
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FOLLY_DETAIL_CPUID_D(de, 2)
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FOLLY_DETAIL_CPUID_D(pse, 3)
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FOLLY_DETAIL_CPUID_D(tsc, 4)
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FOLLY_DETAIL_CPUID_D(msr, 5)
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FOLLY_DETAIL_CPUID_D(pae, 6)
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FOLLY_DETAIL_CPUID_D(mce, 7)
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FOLLY_DETAIL_CPUID_D(cx8, 8)
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FOLLY_DETAIL_CPUID_D(apic, 9)
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FOLLY_DETAIL_CPUID_D(sep, 11)
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FOLLY_DETAIL_CPUID_D(mtrr, 12)
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FOLLY_DETAIL_CPUID_D(pge, 13)
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FOLLY_DETAIL_CPUID_D(mca, 14)
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FOLLY_DETAIL_CPUID_D(cmov, 15)
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FOLLY_DETAIL_CPUID_D(pat, 16)
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FOLLY_DETAIL_CPUID_D(pse36, 17)
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FOLLY_DETAIL_CPUID_D(psn, 18)
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FOLLY_DETAIL_CPUID_D(clfsh, 19)
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FOLLY_DETAIL_CPUID_D(ds, 21)
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FOLLY_DETAIL_CPUID_D(acpi, 22)
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FOLLY_DETAIL_CPUID_D(mmx, 23)
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FOLLY_DETAIL_CPUID_D(fxsr, 24)
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FOLLY_DETAIL_CPUID_D(sse, 25)
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FOLLY_DETAIL_CPUID_D(sse2, 26)
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FOLLY_DETAIL_CPUID_D(ss, 27)
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FOLLY_DETAIL_CPUID_D(htt, 28)
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FOLLY_DETAIL_CPUID_D(tm, 29)
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FOLLY_DETAIL_CPUID_D(pbe, 31)
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#undef FOLLY_DETAIL_CPUID_D
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// cpuid(7): Extended Features.
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#define FOLLY_DETAIL_CPUID_B(name, bit) FOLLY_DETAIL_CPUID_X(name, f7b_, bit)
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FOLLY_DETAIL_CPUID_B(bmi1, 3)
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FOLLY_DETAIL_CPUID_B(hle, 4)
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FOLLY_DETAIL_CPUID_B(avx2, 5)
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FOLLY_DETAIL_CPUID_B(smep, 7)
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FOLLY_DETAIL_CPUID_B(bmi2, 8)
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FOLLY_DETAIL_CPUID_B(erms, 9)
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FOLLY_DETAIL_CPUID_B(invpcid, 10)
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FOLLY_DETAIL_CPUID_B(rtm, 11)
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FOLLY_DETAIL_CPUID_B(mpx, 14)
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FOLLY_DETAIL_CPUID_B(avx512f, 16)
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FOLLY_DETAIL_CPUID_B(avx512dq, 17)
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FOLLY_DETAIL_CPUID_B(rdseed, 18)
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FOLLY_DETAIL_CPUID_B(adx, 19)
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FOLLY_DETAIL_CPUID_B(smap, 20)
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FOLLY_DETAIL_CPUID_B(avx512ifma, 21)
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FOLLY_DETAIL_CPUID_B(pcommit, 22)
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FOLLY_DETAIL_CPUID_B(clflushopt, 23)
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FOLLY_DETAIL_CPUID_B(clwb, 24)
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FOLLY_DETAIL_CPUID_B(avx512pf, 26)
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FOLLY_DETAIL_CPUID_B(avx512er, 27)
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FOLLY_DETAIL_CPUID_B(avx512cd, 28)
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FOLLY_DETAIL_CPUID_B(sha, 29)
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FOLLY_DETAIL_CPUID_B(avx512bw, 30)
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FOLLY_DETAIL_CPUID_B(avx512vl, 31)
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#undef FOLLY_DETAIL_CPUID_B
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#define FOLLY_DETAIL_CPUID_C(name, bit) FOLLY_DETAIL_CPUID_X(name, f7c_, bit)
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FOLLY_DETAIL_CPUID_C(prefetchwt1, 0)
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FOLLY_DETAIL_CPUID_C(avx512vbmi, 1)
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#undef FOLLY_DETAIL_CPUID_C
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#undef FOLLY_DETAIL_CPUID_X
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private:
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uint32_t f1c_ = 0;
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uint32_t f1d_ = 0;
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uint32_t f7b_ = 0;
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uint32_t f7c_ = 0;
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};
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} // namespace folly
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