[InstCombine] Signed saturation patterns
[llvm-complete.git] / include / llvm / Support / Host.h
blob44f543c363db5927875df27e20e03b4a57f221a1
1 //===- llvm/Support/Host.h - Host machine characteristics --------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Methods for querying the nature of the host machine.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_SUPPORT_HOST_H
14 #define LLVM_SUPPORT_HOST_H
16 #include "llvm/ADT/StringMap.h"
18 #include <string>
20 namespace llvm {
21 namespace sys {
23 /// getDefaultTargetTriple() - Return the default target triple the compiler
24 /// has been configured to produce code for.
25 ///
26 /// The target triple is a string in the format of:
27 /// CPU_TYPE-VENDOR-OPERATING_SYSTEM
28 /// or
29 /// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM
30 std::string getDefaultTargetTriple();
32 /// getProcessTriple() - Return an appropriate target triple for generating
33 /// code to be loaded into the current process, e.g. when using the JIT.
34 std::string getProcessTriple();
36 /// getHostCPUName - Get the LLVM name for the host CPU. The particular format
37 /// of the name is target dependent, and suitable for passing as -mcpu to the
38 /// target which matches the host.
39 ///
40 /// \return - The host CPU name, or empty if the CPU could not be determined.
41 StringRef getHostCPUName();
43 /// getHostCPUFeatures - Get the LLVM names for the host CPU features.
44 /// The particular format of the names are target dependent, and suitable for
45 /// passing as -mattr to the target which matches the host.
46 ///
47 /// \param Features - A string mapping feature names to either
48 /// true (if enabled) or false (if disabled). This routine makes no guarantees
49 /// about exactly which features may appear in this map, except that they are
50 /// all valid LLVM feature names.
51 ///
52 /// \return - True on success.
53 bool getHostCPUFeatures(StringMap<bool> &Features);
55 /// Get the number of physical cores (as opposed to logical cores returned
56 /// from thread::hardware_concurrency(), which includes hyperthreads).
57 /// Returns -1 if unknown for the current host system.
58 int getHostNumPhysicalCores();
60 namespace detail {
61 /// Helper functions to extract HostCPUName from /proc/cpuinfo on linux.
62 StringRef getHostCPUNameForPowerPC(StringRef ProcCpuinfoContent);
63 StringRef getHostCPUNameForARM(StringRef ProcCpuinfoContent);
64 StringRef getHostCPUNameForS390x(StringRef ProcCpuinfoContent);
65 StringRef getHostCPUNameForBPF();
70 #endif