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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
51 lines
1.3 KiB
TableGen
51 lines
1.3 KiB
TableGen
//===-- BPF.td - Describe the BPF Target Machine -----------*- tablegen -*-===//
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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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include "llvm/Target/Target.td"
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include "BPFRegisterInfo.td"
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include "BPFCallingConv.td"
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include "BPFInstrInfo.td"
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def BPFInstrInfo : InstrInfo;
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class Proc<string Name, list<SubtargetFeature> Features>
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: Processor<Name, NoItineraries, Features>;
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def : Proc<"generic", []>;
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def : Proc<"v1", []>;
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def : Proc<"v2", []>;
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def : Proc<"probe", []>;
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def DummyFeature : SubtargetFeature<"dummy", "isDummyMode",
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"true", "unused feature">;
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def BPFInstPrinter : AsmWriter {
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string AsmWriterClassName = "InstPrinter";
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bit isMCAsmWriter = 1;
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}
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def BPFAsmParser : AsmParser {
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bit HasMnemonicFirst = 0;
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}
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def BPFAsmParserVariant : AsmParserVariant {
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int Variant = 0;
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string Name = "BPF";
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string BreakCharacters = ".";
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string TokenizingCharacters = "#()[]=:.<>!+*";
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}
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def BPF : Target {
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let InstructionSet = BPFInstrInfo;
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let AssemblyWriters = [BPFInstPrinter];
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let AssemblyParsers = [BPFAsmParser];
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let AssemblyParserVariants = [BPFAsmParserVariant];
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}
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