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c702b7f668
-mcpu=# will support:
. generic: the default insn set
. v1: insn set version 1, the same as generic
. v2: insn set version 2, version 1 + additional jmp insns
. probe: the compiler will probe the underlying kernel to
decide proper version of insn set.
We did not not use -mcpu=native since llc/llvm will interpret -mcpu=native
as the underlying hardware architecture regardless of -march value.
Currently, only x86_64 supports -mcpu=probe. Other architecture will
silently revert to "generic".
Also added -mcpu=help to print available cpu parameters.
llvm will print out the information only if there are at least one
cpu and at least one feature. Add an unused dummy feature to
enable the printout.
Examples for usage:
$ llc -march=bpf -mcpu=v1 -filetype=asm t.ll
$ llc -march=bpf -mcpu=v2 -filetype=asm t.ll
$ llc -march=bpf -mcpu=generic -filetype=asm t.ll
$ llc -march=bpf -mcpu=probe -filetype=asm t.ll
$ llc -march=bpf -mcpu=v3 -filetype=asm t.ll
'v3' is not a recognized processor for this target (ignoring processor)
...
$ llc -march=bpf -mcpu=help -filetype=asm t.ll
Available CPUs for this target:
generic - Select the generic processor.
probe - Select the probe processor.
v1 - Select the v1 processor.
v2 - Select the v2 processor.
Available features for this target:
dummy - unused feature.
Use +feature to enable a feature, or -feature to disable it.
For example, llc -mcpu=mycpu -mattr=+feature1,-feature2
...
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
llvm-svn: 311522
101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
//===- llvm/Support/Host.h - Host machine characteristics --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Methods for querying the nature of the host machine.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_HOST_H
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#define LLVM_SUPPORT_HOST_H
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Support/MemoryBuffer.h"
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#if defined(__linux__) || defined(__GNU__) || defined(__HAIKU__)
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#include <endian.h>
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#elif defined(_AIX)
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#include <sys/machine.h>
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#elif defined(__sun)
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/* Solaris provides _BIG_ENDIAN/_LITTLE_ENDIAN selector in sys/types.h */
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#include <sys/types.h>
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#define BIG_ENDIAN 4321
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#define LITTLE_ENDIAN 1234
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#if defined(_BIG_ENDIAN)
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#define BYTE_ORDER BIG_ENDIAN
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#else
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#define BYTE_ORDER LITTLE_ENDIAN
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#endif
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#else
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#if !defined(BYTE_ORDER) && !defined(LLVM_ON_WIN32)
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#include <machine/endian.h>
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#endif
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#endif
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#include <string>
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namespace llvm {
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namespace sys {
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#if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
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constexpr bool IsBigEndianHost = true;
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#else
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constexpr bool IsBigEndianHost = false;
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#endif
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static const bool IsLittleEndianHost = !IsBigEndianHost;
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/// getDefaultTargetTriple() - Return the default target triple the compiler
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/// has been configured to produce code for.
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///
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/// The target triple is a string in the format of:
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/// CPU_TYPE-VENDOR-OPERATING_SYSTEM
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/// or
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/// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM
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std::string getDefaultTargetTriple();
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/// getProcessTriple() - Return an appropriate target triple for generating
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/// code to be loaded into the current process, e.g. when using the JIT.
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std::string getProcessTriple();
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/// getHostCPUName - Get the LLVM name for the host CPU. The particular format
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/// of the name is target dependent, and suitable for passing as -mcpu to the
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/// target which matches the host.
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///
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/// \return - The host CPU name, or empty if the CPU could not be determined.
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StringRef getHostCPUName();
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/// getHostCPUFeatures - Get the LLVM names for the host CPU features.
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/// The particular format of the names are target dependent, and suitable for
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/// passing as -mattr to the target which matches the host.
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///
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/// \param Features - A string mapping feature names to either
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/// true (if enabled) or false (if disabled). This routine makes no guarantees
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/// about exactly which features may appear in this map, except that they are
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/// all valid LLVM feature names.
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///
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/// \return - True on success.
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bool getHostCPUFeatures(StringMap<bool> &Features);
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/// Get the number of physical cores (as opposed to logical cores returned
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/// from thread::hardware_concurrency(), which includes hyperthreads).
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/// Returns -1 if unknown for the current host system.
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int getHostNumPhysicalCores();
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namespace detail {
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/// Helper functions to extract HostCPUName from /proc/cpuinfo on linux.
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StringRef getHostCPUNameForPowerPC(const StringRef &ProcCpuinfoContent);
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StringRef getHostCPUNameForARM(const StringRef &ProcCpuinfoContent);
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StringRef getHostCPUNameForS390x(const StringRef &ProcCpuinfoContent);
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StringRef getHostCPUNameForBPF();
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}
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}
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}
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#endif
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